{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-48751", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-20T11:09:39.057Z", "datePublished": "2024-06-20T11:13:32.575Z", "dateUpdated": "2026-08-05T08:52:07.796Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:52:07.796Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Transitional solution for clcsock race issue\n\nWe encountered a crash in smc_setsockopt() and it is caused by\naccessing smc->clcsock after clcsock was released.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000020\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53\n RIP: 0010:smc_setsockopt+0x59/0x280 [smc]\n Call Trace:\n <TASK>\n __sys_setsockopt+0xfc/0x190\n __x64_sys_setsockopt+0x20/0x30\n do_syscall_64+0x34/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f16ba83918e\n </TASK>\n\nThis patch tries to fix it by holding clcsock_release_lock and\nchecking whether clcsock has already been released before access.\n\nIn case that a crash of the same reason happens in smc_getsockopt()\nor smc_switch_to_fallback(), this patch also checkes smc->clcsock\nin them too. And the caller of smc_switch_to_fallback() will identify\nwhether fallback succeeds according to the return value."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached via local socket syscalls (setsockopt/getsockopt/fallback) on an AF_SMC socket; a remote peer alone cannot invoke the vulnerable paths without local process participation.\nAC:L - The attacker controls both sides of the race by concurrently calling setsockopt/getsockopt and close (or otherwise triggering smc_clcsock_release) on a shared AF_SMC fd, so success does not depend on conditions outside attacker influence.\nPR:L - Creating and operating AF_SMC sockets requires only an unprivileged local account; smc_create has no capability check, and user namespaces are not required.\nUI:N - Exploitation uses only the attacker's own syscalls on sockets they create; no separate victim action is required.\nS:U - Impact is confined to the local kernel's SMC/socket authority; this is standard kernel memory-safety damage, not a cross-boundary escape.\nC:H - The unlocked clcsock access races with smc_clcsock_release()'s sock_release, yielding a use-after-free on the TCP CLC socket object that can be reclaimed and read through.\nI:H - The same UAF is exercised by smc_switch_to_fallback(), which writes clcsock fields and splices wait-queues through the freed pointer, enabling heap corruption and control-flow hijacking primitives.\nA:H - The race reliably produces kernel NULL pointer dereference or UAF oops/panic (as in the reported smc_setsockopt crash), causing full availability loss."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/af_smc.c"], "versions": [{"version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "38f0bdd548fd2ef5d481b88d8a2bfef968452e34", "status": "affected", "versionType": "git"}, {"version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "4284225cd8001e134f5cf533a7cd244bbb654d0f", "status": "affected", "versionType": "git"}, {"version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760", "status": "affected", "versionType": "git"}, {"version": "d1d004585b40c212b338fc8a40cbaaf230ea4703", "status": "affected", "versionType": "git"}, {"version": "4.19.299", "lessThan": "4.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/af_smc.c"], "versions": [{"version": "5.1", "status": "affected"}, {"version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.19", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.16.5", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.17", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.15.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.16.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.299"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"}, {"url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"}, {"url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"}], "title": "net/smc: Transitional solution for clcsock race issue", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:25:00.333Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-48751", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T17:10:28.867754Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:47.967Z"}}]}}

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a remote peer alone cannot invoke the vulnerable paths without local process participation.\nAC:L - The attacker controls both sides of the race by concurrently calling setsockopt/getsockopt and close (or otherwise triggering smc_clcsock_release) on a shared AF_SMC fd, so success does not depend on conditions outside attacker influence.\nPR:L - Creating and operating AF_SMC sockets requires only an unprivileged local account; smc_create has no capability check, and user namespaces are not required.\nUI:N - Exploitation uses only the attacker's own syscalls on sockets they create; no separate victim action is required.\nS:U - Impact is confined to the local kernel's SMC/socket authority; this is standard kernel memory-safety damage, not a cross-boundary escape.\nC:H - The unlocked clcsock access races with smc_clcsock_release()'s sock_release, yielding a use-after-free on the TCP CLC socket object that can be reclaimed and read through.\nI:H - The same UAF is exercised by smc_switch_to_fallback(), which writes clcsock fields and splices wait-queues through the freed pointer, enabling heap corruption and control-flow hijacking primitives.\nA:H - The race reliably produces kernel NULL pointer dereference or UAF oops/panic (as in the reported smc_setsockopt crash), causing full availability loss."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "38f0bdd548fd2ef5d481b88d8a2bfef968452e34", "versionType": "git"}, {"status": "affected", "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "4284225cd8001e134f5cf533a7cd244bbb654d0f", "versionType": "git"}, {"status": "affected", "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760", "versionType": "git"}, {"status": "affected", "version": "d1d004585b40c212b338fc8a40cbaaf230ea4703", "versionType": "git"}, {"status": "affected", "version": "4.19.299", "lessThan": "4.20", "versionType": "semver"}], "programFiles": ["net/smc/af_smc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.1"}, {"status": "unaffected", "version": "0", "lessThan": "5.1", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.19", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16.5", "versionType": "semver", "lessThanOrEqual": "5.16.*"}, {"status": "unaffected", "version": "5.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/smc/af_smc.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"}, {"url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"}, {"url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Transitional solution for clcsock race issue\n\nWe encountered a crash in smc_setsockopt() and it is caused by\naccessing smc->clcsock after clcsock was released.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000020\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53\n RIP: 0010:smc_setsockopt+0x59/0x280 [smc]\n Call Trace:\n <TASK>\n __sys_setsockopt+0xfc/0x190\n __x64_sys_setsockopt+0x20/0x30\n do_syscall_64+0x34/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f16ba83918e\n </TASK>\n\nThis patch tries to fix it by holding clcsock_release_lock and\nchecking whether clcsock has already been released before access.\n\nIn case that a crash of the same reason happens in smc_getsockopt()\nor smc_switch_to_fallback(), this patch also checkes smc->clcsock\nin them too. And the caller of smc_switch_to_fallback() will identify\nwhether fallback succeeds according to the return value."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.19", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16.5", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.17", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.19.299"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:52:07.796Z"}}}, "cveMetadata": {"cveId": "CVE-2022-48751", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:52:07.796Z", "dateReserved": "2024-06-20T11:09:39.057Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-06-20T11:13:32.575Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/smc/af_smc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "38f0bdd548fd2ef5d481b88d8a2bfef968452e34", "status": "affected", "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "versionType": "git"}, {"lessThan": "4284225cd8001e134f5cf533a7cd244bbb654d0f", "status": "affected", "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "versionType": "git"}, {"lessThan": "c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760", "status": "affected", "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "versionType": "git"}, {"status": "affected", "version": "d1d004585b40c212b338fc8a40cbaaf230ea4703", "versionType": "git"}, {"lessThan": "4.20", "status": "affected", "version": "4.19.299", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/smc/af_smc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.1"}, {"lessThan": "5.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.19", "versionType": "semver"}, {"lessThanOrEqual": "5.16.*", "status": "unaffected", "version": "5.16.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "44FFBF29-9694-41CD-AA3D-99C3AAF1B68C", "versionEndExcluding": "4.20", "versionStartIncluding": "4.19.299", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1B4F4191-DE6E-4A91-8E8B-134347A9A034", "versionEndExcluding": "5.15.19", "versionStartIncluding": "5.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1AD9E77E-B27E-450C-8FD8-B64EC5FB002D", "versionEndExcluding": "5.16.5", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Transitional solution for clcsock race issue\n\nWe encountered a crash in smc_setsockopt() and it is caused by\naccessing smc->clcsock after clcsock was released.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000020\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53\n RIP: 0010:smc_setsockopt+0x59/0x280 [smc]\n Call Trace:\n <TASK>\n __sys_setsockopt+0xfc/0x190\n __x64_sys_setsockopt+0x20/0x30\n do_syscall_64+0x34/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f16ba83918e\n </TASK>\n\nThis patch tries to fix it by holding clcsock_release_lock and\nchecking whether clcsock has already been released before access.\n\nIn case that a crash of the same reason happens in smc_getsockopt()\nor smc_switch_to_fallback(), this patch also checkes smc->clcsock\nin them too. And the caller of smc_switch_to_fallback() will identify\nwhether fallback succeeds according to the return value."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net/smc: soluci\u00f3n transitoria para el problema de ejecuci\u00f3n de clcsock Encontramos un bloqueo en smc_setsockopt() y se debe al acceso a smc-&gt;clcsock despu\u00e9s de que se lanz\u00f3 clcsock. ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000020 #PF: acceso de lectura del supervisor en modo kernel #PF: c\u00f3digo_error(0x0000) - p\u00e1gina no presente PGD 0 P4D 0 Ups: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 50309 Comm: nginx Kdump: cargado Contaminado: GE 5.16.0-rc4+ #53 RIP: 0010:smc_setsockopt+0x59/0x280 [smc] Seguimiento de llamadas: __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e Este parche intenta solucionarlo manteniendo presionado clcsock_release_lock y verificando si clcsock ya se ha liberado antes del acceso. En caso de que ocurra una falla por el mismo motivo en smc_getsockopt() o smc_switch_to_fallback(), este parche tambi\u00e9n verifica smc-&gt;clcsock en ellos. Y la persona que llama a smc_switch_to_fallback() identificar\u00e1 si el respaldo tiene \u00e9xito de acuerdo con el valor de retorno."}], "id": "CVE-2022-48751", "lastModified": "2026-08-04T10:17:19.370", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48751", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:10:28.867754Z", "version": "2.0.3"}}]}, "published": "2024-06-20T12:15:13.310", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/smc: Transitional solution for clcsock race issue", "id": "2293308", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293308"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/smc: Transitional solution for clcsock race issue\nWe encountered a crash in smc_setsockopt() and it is caused by\naccessing smc->clcsock after clcsock was released.\nBUG: kernel NULL pointer dereference, address: 0000000000000020\n#PF: supervisor read access in kernel mode\n#PF: error_code(0x0000) - not-present page\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53\nRIP: 0010:smc_setsockopt+0x59/0x280 [smc]\nCall Trace:\n<TASK>\n__sys_setsockopt+0xfc/0x190\n__x64_sys_setsockopt+0x20/0x30\ndo_syscall_64+0x34/0x90\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7f16ba83918e\n</TASK>\nThis patch tries to fix it by holding clcsock_release_lock and\nchecking whether clcsock has already been released before access.\nIn case that a crash of the same reason happens in smc_getsockopt()\nor smc_switch_to_fallback(), this patch also checkes smc->clcsock\nin them too. And the caller of smc_switch_to_fallback() will identify\nwhether fallback succeeds according to the return value.", "A flaw was found in the Linux kernel. A potential crash was observed in smc_setsockopt()."], "name": "CVE-2022-48751", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48751\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48751\nhttps://lore.kernel.org/linux-cve-announce/2024062005-CVE-2022-48751-10d0@gregkh/T"], "threat_severity": "Moderate"}