{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47013", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-27T18:42:55.953Z", "datePublished": "2024-02-28T08:13:30.905Z", "dateUpdated": "2026-08-05T08:45:34.504Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:45:34.504Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send\n\nIn emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).\nIf some error happens in emac_tx_fill_tpd(), the skb will be freed via\ndev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().\nBut the freed skb is still used via skb->len by netdev_sent_queue(,skb->len).\n\nAs i observed that emac_tx_fill_tpd() haven't modified the value of skb->len,\nthus my patch assigns skb->len to 'len' before the possible free and\nuse 'len' instead of skb->len later."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in the Qualcomm EMAC ndo_start_xmit path (emac_start_xmit \u2192 emac_mac_tx_buf_send), used on network-facing FSM9900/QDF platforms; a remote peer can drive TX via ARP/ICMP/TCP replies or forwarded traffic through this NIC, matching other ethernet TX CVEs.\nAC:L - An attacker can flood traffic to raise DMA/swiotlb pressure until dma_mapping_error() hits; once that failure occurs the UAF of skb->len is deterministic, as scored for similar dma_mapping_error TX bugs (e.g. CVE-2024-50170).\nPR:N - No authentication or capability check sits on this path\u2014unauthenticated remote traffic that elicits kernel TX, or an unprivileged local socket send, reaches emac_mac_tx_buf_send.\nUI:N - No victim action is required; ordinary network traffic or local sends autonomously exercise the transmit path.\nS:U - The UAF corrupts/abuses kernel skb and BQL state within the same host security authority; the TX ring produce index is rolled back on the error path so no IOMMU/DMA boundary is crossed.\nC:H - This is a use-after-free of an sk_buff: after dev_kfree_skb() the freed object can be reclaimed via heap spray, and UAF of skb metadata is treated as enabling arbitrary kernel memory disclosure primitives.\nI:H - Use-after-free of the skb enables heap reuse/type confusion and attacker-controlled BQL byte accounting via the post-free skb->len read, which is leverageable for memory corruption and control-flow impact.\nA:H - Dereferencing the freed skb can oops if the object is poisoned or unmapped, and the post-free netdev_sent_queue() permanently inflates BQL without a matching completion, enabling TX queue stall or kernel 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platforms; a remote peer can drive TX via ARP/ICMP/TCP replies or forwarded traffic through this NIC, matching other ethernet TX CVEs.\nAC:L - An attacker can flood traffic to raise DMA/swiotlb pressure until dma_mapping_error() hits; once that failure occurs the UAF of skb->len is deterministic, as scored for similar dma_mapping_error TX bugs (e.g. CVE-2024-50170).\nPR:N - No authentication or capability check sits on this path\u2014unauthenticated remote traffic that elicits kernel TX, or an unprivileged local socket send, reaches emac_mac_tx_buf_send.\nUI:N - No victim action is required; ordinary network traffic or local sends autonomously exercise the transmit path.\nS:U - The UAF corrupts/abuses kernel skb and BQL state within the same host security authority; the TX ring produce index is rolled back on the error path so no IOMMU/DMA boundary is crossed.\nC:H - This is a use-after-free of an sk_buff: after dev_kfree_skb() the freed object can be reclaimed via heap spray, and UAF of skb metadata is treated as enabling arbitrary kernel memory disclosure primitives.\nI:H - Use-after-free of the skb enables heap reuse/type confusion and attacker-controlled BQL byte accounting via the post-free skb->len read, which is leverageable for memory corruption and control-flow impact.\nA:H - Dereferencing the freed skb can oops if the object is poisoned or unmapped, and the post-free netdev_sent_queue() permanently inflates BQL without a matching completion, enabling TX queue stall or kernel crash."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "lessThan": "c7f75d11fe72913d2619f97b2334b083cd7bb955", "versionType": "git"}, {"status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "lessThan": "dc1b438a35773d030be0ee80d9c635c3e558a322", "versionType": "git"}, {"status": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/qualcomm/emac/emac-mac.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c7f75d11fe72913d2619f97b2334b083cd7bb955", "status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "versionType": "git"}, {"lessThan": "dc1b438a35773d030be0ee80d9c635c3e558a322", "status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "versionType": "git"}, {"lessThan": "16d8c44be52e3650917736d45f5904384a9da834", "status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "versionType": "git"}, {"lessThan": "55fcdd1258faaecca74b91b88cc0921f9edd775d", "status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "versionType": "git"}, {"lessThan": "9dc373f74097edd0e35f3393d6248eda8d1ba99d", "status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "versionType": "git"}, {"lessThan": "8c06f34785068b87e2b560534c77c163d6c6dca7", "status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "versionType": "git"}, {"lessThan": "e407495ba6788a67d1bd41714158c079e340879b", "status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "versionType": "git"}, {"lessThan": "6d72e7c767acbbdd44ebc7d89c6690b405b32b57", "status": "affected", "version": "b9b17debc69d27cd55e21ee51a5ba7fc50a426cf", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/qualcomm/emac/emac-mac.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.9"}, {"lessThan": "4.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.9.*", "status": "unaffected", "version": "4.9.269", "versionType": "semver"}, {"lessThanOrEqual": "4.14.*", "status": "unaffected", "version": "4.14.233", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.191", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.119", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.37", "versionType": "semver"}, {"lessThanOrEqual": "5.11.*", "status": "unaffected", "version": "5.11.21", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5330E43C-47EE-40CA-B1A9-C1AAC143732E", "versionEndExcluding": "4.9.269", "versionStartIncluding": "4.9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4836AF17-022D-49D0-9A8A-AF66FE8DCEB8", "versionEndExcluding": "4.14.233", "versionStartIncluding": "4.10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5B6E6817-19A8-4C0A-8807-71DA48CF9191", "versionEndExcluding": "4.19.191", "versionStartIncluding": "4.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E07BA880-1043-4674-AC45-266B3B4A44C7", "versionEndExcluding": "5.4.119", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7A4CF5D6-ACBA-4980-ABFD-3D7A53B5BB4E", "versionEndExcluding": "5.10.37", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8CBB94EC-EC33-4464-99C5-03E5542715F0", "versionEndExcluding": "5.11.21", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D8C7052F-1B7B-4327-9C2B-84EBF3243838", "versionEndExcluding": "5.12.4", "versionStartIncluding": "5.12", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send\n\nIn emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).\nIf some error happens in emac_tx_fill_tpd(), the skb will be freed via\ndev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().\nBut the freed skb is still used via skb->len by netdev_sent_queue(,skb->len).\n\nAs i observed that emac_tx_fill_tpd() haven't modified the value of skb->len,\nthus my patch assigns skb->len to 'len' before the possible free and\nuse 'len' instead of skb->len later."}, {"lang": "es", "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:emac/emac-mac: Se corrige un uso after free en emac_mac_tx_buf_send En emac_mac_tx_buf_send, llama a emac_tx_fill_tpd(..,skb,..). Si ocurre alg\u00fan error en emac_tx_fill_tpd(), el skb se liberar\u00e1 mediante dev_kfree_skb(skb) en la rama de error de emac_tx_fill_tpd(). Pero el skb liberado todav\u00eda se usa a trav\u00e9s de skb->len por netdev_sent_queue(,skb->len). Como observ\u00e9 que emac_tx_fill_tpd() no ha modificado el valor de skb->len, por lo tanto mi parche asigna skb->len a 'len' antes del posible free y usa 'len' en lugar de skb->len m\u00e1s tarde."}], "id": "CVE-2021-47013", "lastModified": "2026-08-04T10:16:41.567", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47013", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-02-28T19:56:27.719807Z", "version": "2.0.3"}}]}, "published": "2024-02-28T09:15:38.800", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:3627", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.5.1.rt7.346.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-06-05T00:00:00Z"}, {"advisory": "RHSA-2024:3618", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.5.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-06-05T00:00:00Z"}, {"advisory": "RHSA-2024:3462", "cpe": "cpe:/o:redhat:rhel_eus:8.6", "package": "kernel-0:4.18.0-372.105.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2024-05-29T00:00:00Z"}, {"advisory": "RHSA-2024:3810", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.58.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-06-11T00:00:00Z"}, {"advisory": "RHSA-2024:3462", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "kernel-0:4.18.0-372.105.1.el8_6", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2024-05-29T00:00:00Z"}], "bugzilla": {"description": "kernel: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send", "id": "2266841", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266841"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send\nIn emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).\nIf some error happens in emac_tx_fill_tpd(), the skb will be freed via\ndev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().\nBut the freed skb is still used via skb->len by netdev_sent_queue(,skb->len).\nAs i observed that emac_tx_fill_tpd() haven't modified the value of skb->len,\nthus my patch assigns skb->len to 'len' before the possible free and\nuse 'len' instead of skb->len later.", "A use-after-free flaw was found in the Linux kernel\u2019s Qualcomm Gigabit Ethernet Media Access Controller (EMAC) driver in how a user triggers an error path in the emac_tx_fill_tpd function. This flaw allows a local user to crash or potentially escalate their privileges on the system."], "name": "CVE-2021-47013", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47013\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47013\nhttps://lore.kernel.org/linux-cve-announce/2024022831-CVE-2021-47013-034a@gregkh/T/#u"], "threat_severity": "Moderate"}