{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68284", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.379Z", "datePublished": "2026-08-10T12:02:16.572Z", "dateUpdated": "2026-08-19T16:32:41.174Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:32:41.174Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()\n\ntcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which\ndrops and reacquires the socket lock. Its error path tries to decide\nwhether msg_tx names the local temporary message by comparing it with\nthe current value of psock->cork.\n\nThis comparison is unsafe when two threads send on the same socket:\n\n Thread A Thread B\n msg_tx = psock->cork\n sk_msg_alloc() fails\n sk_stream_wait_memory()\n releases the socket lock acquires the socket lock\n completes the cork\n psock->cork = NULL\n frees the cork\n reacquires the socket lock\n msg_tx != psock->cork\n sk_msg_free(msg_tx)\n\nThe stale cork is therefore mistaken for the local temporary message\nand freed again. KASAN reported:\n\n BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50\n Read of size 4 at addr ffff88810c908800 by task poc/90\n Call Trace:\n sk_msg_free+0x49/0x50\n tcp_bpf_sendmsg+0x14f5/0x1cc0\n __sys_sendto+0x32c/0x3a0\n __x64_sys_sendto+0xdb/0x1b0\n Allocated by task 89:\n __kasan_kmalloc+0x8f/0xa0\n tcp_bpf_sendmsg+0x16b3/0x1cc0\n Freed by task 91:\n __kasan_slab_free+0x43/0x70\n kfree+0x131/0x3c0\n tcp_bpf_sendmsg+0xec3/0x1cc0\n\nmsg_tx can only name the stack-local tmp or the shared cork. Check for\ntmp directly so a changed psock->cork cannot turn a shared message into\nan apparent local one."}], "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 vulnerability is triggered by local `sendmsg()`/`sendto()` syscalls issued concurrently by two threads on the same TCP socket attached to a BPF sockmap; the remote peer cannot drive the race, so this is a local attack surface.\nAC:L - The attacker controls both sides of the race: it owns both sending threads, can force the `wait_for_memory` path deterministically with a small SO_SNDBUF plus a large blocking send, and can force `sk_stream_wait_memory()` to fail via SO_SNDTIMEO or a socket error, making the stale-cork free reliably reachable.\nPR:L - Once the sockmap and sk_msg verdict/cork program are installed by the platform (a standard deployment such as Cilium/Istio sockops acceleration), an ordinary unprivileged local process owning a socket in the map triggers the bug with plain send syscalls; no capability check guards `tcp_bpf_sendmsg()` itself.\nUI:N - The attacker's own two threads perform all the required sends; no action by any other user or victim process is needed.\nS:U - The use-after-free corrupts kernel slab and page state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `sk_msg_free()` reads the freed `sk_msg` cork object (KASAN slab-use-after-free read), and by reclaiming that slab object with attacker-groomed data the freed scatterlist can be steered to leak or expose arbitrary kernel memory contents.\nI:H - Beyond the stale read, the path re-frees the cork's scatterlist pages and uncharges socket memory, giving a double-free/page-refcount-underflow primitive on an attacker-groomable slab object, which is classically leveraged into arbitrary kernel write and control-flow hijack.\nA:H - The use-after-free and duplicate page release corrupt slab and page allocator state, reliably producing a kernel oops or panic and taking the whole system down."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_bpf.c"], "versions": [{"version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "lessThan": "0688e6fe599d2d39147ae9ece97944c6e1815ebf", "status": "affected", "versionType": "git"}, {"version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "lessThan": "b2bcbeabfd843d47468fa095b1bd08ddb90cf616", "status": "affected", "versionType": "git"}, {"version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "lessThan": "54be47e7cbb936429c3bbdfc526ea943954aaf80", "status": "affected", "versionType": "git"}, {"version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "lessThan": "ee762f684eefa59de34d9ed93cab08336e834f47", "status": "affected", "versionType": "git"}, {"version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "lessThan": "cde4d6bcd9b73073c66498f6723c7b364c4dbc18", "status": "affected", "versionType": "git"}, {"version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "lessThan": "786d690257ec7a0c839f8710456e444ce3f1348b", "status": "affected", "versionType": "git"}, {"version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "lessThan": "752b1159ed5d0c48fe169a3721b96660a9822aa1", "status": "affected", "versionType": "git"}, {"version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "lessThan": "2d66a033864e27ab8d5e44cb36f31d9d2413bee4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_bpf.c"], "versions": [{"version": "4.20", "status": "affected"}, {"version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "4.20", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0688e6fe599d2d39147ae9ece97944c6e1815ebf"}, {"url": "https://git.kernel.org/stable/c/b2bcbeabfd843d47468fa095b1bd08ddb90cf616"}, {"url": "https://git.kernel.org/stable/c/54be47e7cbb936429c3bbdfc526ea943954aaf80"}, {"url": "https://git.kernel.org/stable/c/ee762f684eefa59de34d9ed93cab08336e834f47"}, {"url": "https://git.kernel.org/stable/c/cde4d6bcd9b73073c66498f6723c7b364c4dbc18"}, {"url": "https://git.kernel.org/stable/c/786d690257ec7a0c839f8710456e444ce3f1348b"}, {"url": "https://git.kernel.org/stable/c/752b1159ed5d0c48fe169a3721b96660a9822aa1"}, {"url": "https://git.kernel.org/stable/c/2d66a033864e27ab8d5e44cb36f31d9d2413bee4"}], "title": "bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/tcp_bpf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0688e6fe599d2d39147ae9ece97944c6e1815ebf", "status": "affected", "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "versionType": "git"}, {"lessThan": "b2bcbeabfd843d47468fa095b1bd08ddb90cf616", "status": "affected", "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "versionType": "git"}, {"lessThan": "54be47e7cbb936429c3bbdfc526ea943954aaf80", "status": "affected", "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "versionType": "git"}, {"lessThan": "ee762f684eefa59de34d9ed93cab08336e834f47", "status": "affected", "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "versionType": "git"}, {"lessThan": "cde4d6bcd9b73073c66498f6723c7b364c4dbc18", "status": "affected", "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "versionType": "git"}, {"lessThan": "786d690257ec7a0c839f8710456e444ce3f1348b", "status": "affected", "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "versionType": "git"}, {"lessThan": "752b1159ed5d0c48fe169a3721b96660a9822aa1", "status": "affected", "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "versionType": "git"}, {"lessThan": "2d66a033864e27ab8d5e44cb36f31d9d2413bee4", "status": "affected", "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/tcp_bpf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.20"}, {"lessThan": "4.20", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()\n\ntcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which\ndrops and reacquires the socket lock. Its error path tries to decide\nwhether msg_tx names the local temporary message by comparing it with\nthe current value of psock->cork.\n\nThis comparison is unsafe when two threads send on the same socket:\n\n Thread A Thread B\n msg_tx = psock->cork\n sk_msg_alloc() fails\n sk_stream_wait_memory()\n releases the socket lock acquires the socket lock\n completes the cork\n psock->cork = NULL\n frees the cork\n reacquires the socket lock\n msg_tx != psock->cork\n sk_msg_free(msg_tx)\n\nThe stale cork is therefore mistaken for the local temporary message\nand freed again. KASAN reported:\n\n BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50\n Read of size 4 at addr ffff88810c908800 by task poc/90\n Call Trace:\n sk_msg_free+0x49/0x50\n tcp_bpf_sendmsg+0x14f5/0x1cc0\n __sys_sendto+0x32c/0x3a0\n __x64_sys_sendto+0xdb/0x1b0\n Allocated by task 89:\n __kasan_kmalloc+0x8f/0xa0\n tcp_bpf_sendmsg+0x16b3/0x1cc0\n Freed by task 91:\n __kasan_slab_free+0x43/0x70\n kfree+0x131/0x3c0\n tcp_bpf_sendmsg+0xec3/0x1cc0\n\nmsg_tx can only name the stack-local tmp or the shared cork. Check for\ntmp directly so a changed psock->cork cannot turn a shared message into\nan apparent local one."}], "id": "CVE-2026-68284", "lastModified": "2026-08-19T17:20:40.573", "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"}]}, "published": "2026-08-10T13:20:17.670", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0688e6fe599d2d39147ae9ece97944c6e1815ebf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2d66a033864e27ab8d5e44cb36f31d9d2413bee4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/54be47e7cbb936429c3bbdfc526ea943954aaf80"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/752b1159ed5d0c48fe169a3721b96660a9822aa1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/786d690257ec7a0c839f8710456e444ce3f1348b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2bcbeabfd843d47468fa095b1bd08ddb90cf616"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cde4d6bcd9b73073c66498f6723c7b364c4dbc18"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ee762f684eefa59de34d9ed93cab08336e834f47"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: bpf/sockmap use-after-free vulnerability leading to denial of service", "id": "2513263", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513263"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()\ntcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which\ndrops and reacquires the socket lock. Its error path tries to decide\nwhether msg_tx names the local temporary message by comparing it with\nthe current value of psock->cork.\nThis comparison is unsafe when two threads send on the same socket:\nThread A Thread B\nmsg_tx = psock->cork\nsk_msg_alloc() fails\nsk_stream_wait_memory()\nreleases the socket lock acquires the socket lock\ncompletes the cork\npsock->cork = NULL\nfrees the cork\nreacquires the socket lock\nmsg_tx != psock->cork\nsk_msg_free(msg_tx)\nThe stale cork is therefore mistaken for the local temporary message\nand freed again. KASAN reported:\nBUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50\nRead of size 4 at addr ffff88810c908800 by task poc/90\nCall Trace:\nsk_msg_free+0x49/0x50\ntcp_bpf_sendmsg+0x14f5/0x1cc0\n__sys_sendto+0x32c/0x3a0\n__x64_sys_sendto+0xdb/0x1b0\nAllocated by task 89:\n__kasan_kmalloc+0x8f/0xa0\ntcp_bpf_sendmsg+0x16b3/0x1cc0\nFreed by task 91:\n__kasan_slab_free+0x43/0x70\nkfree+0x131/0x3c0\ntcp_bpf_sendmsg+0xec3/0x1cc0\nmsg_tx can only name the stack-local tmp or the shared cork. Check for\ntmp directly so a changed psock->cork cannot turn a shared message into\nan apparent local one.", "A flaw was found in the Linux kernel. A use-after-free vulnerability exists in the `tcp_bpf_sendmsg()` function within the BPF (Berkeley Packet Filter) and sockmap components. This flaw occurs when two threads attempt to send data on the same socket concurrently, leading to an incorrect memory deallocation. A local attacker could exploit this to cause a system crash, resulting in a denial of service."], "name": "CVE-2026-68284", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:02:16Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68284\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68284\nhttps://git.kernel.org/stable/c/2d66a033864e27ab8d5e44cb36f31d9d2413bee4\nhttps://git.kernel.org/stable/c/752b1159ed5d0c48fe169a3721b96660a9822aa1\nhttps://git.kernel.org/stable/c/786d690257ec7a0c839f8710456e444ce3f1348b\nhttps://git.kernel.org/stable/c/cde4d6bcd9b73073c66498f6723c7b364c4dbc18\nhttps://git.kernel.org/stable/c/ee762f684eefa59de34d9ed93cab08336e834f47"], "threat_severity": "Important"}