CVE-2021-47232

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This leads to a Use-after-Free if\nthe skb is taken concurrently from the session queue due to a CTS."}], "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 UAF is reached via can_rcv \u2192 j1939_can_recv \u2192 j1939_tp_recv when processing peer TP.CM_CTS/DAT frames; an unauthenticated J1939/CAN peer drives the race, consistent with other packet-triggered j1939 scores (e.g. CVE-2024-56645).\nAC:L - The attacker controls CTS injection timing against an active TP session and can retry indefinitely; when both sides of the race are attacker-driven (local sockets/vcan or crafted bus traffic), success does not depend on conditions outside attacker influence.\nPR:N - J1939 receive processing has no authentication; a bus peer needs no credentials on the target, and the same path is also reachable from an unprivileged AF_CAN/CAN_J1939 socket with no capability checks on create/bind/send.\nUI:N - Frames are handled in softirq with no victim action required beyond a bound J1939 socket, which is the normal steady state on systems using this stack.\nS:U - The corrupted sk_buff and resulting privilege impact remain within the kernel's security authority; this is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Use-after-free of the session skb enables heap grooming and arbitrary read of freed object contents (including via continued use of the dangling skb pointer in TX/RX data paths).\nI:H - The same UAF yields a reclaimable freed sk_buff that can be sprayed for arbitrary write and control-flow hijacking primitives in the kernel heap.\nA:H - Dereferencing the freed skb causes kernel oops/panic, and an unauthenticated peer can trigger the race repeatedly to deny service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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an unauthenticated J1939/CAN peer drives the race, consistent with other packet-triggered j1939 scores (e.g. CVE-2024-56645).\nAC:L - The attacker controls CTS injection timing against an active TP session and can retry indefinitely; when both sides of the race are attacker-driven (local sockets/vcan or crafted bus traffic), success does not depend on conditions outside attacker influence.\nPR:N - J1939 receive processing has no authentication; a bus peer needs no credentials on the target, and the same path is also reachable from an unprivileged AF_CAN/CAN_J1939 socket with no capability checks on create/bind/send.\nUI:N - Frames are handled in softirq with no victim action required beyond a bound J1939 socket, which is the normal steady state on systems using this stack.\nS:U - The corrupted sk_buff and resulting privilege impact remain within the kernel's security authority; this is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Use-after-free of the session skb enables heap grooming and arbitrary read of freed object contents (including via continued use of the dangling skb pointer in TX/RX data paths).\nI:H - The same UAF yields a reclaimable freed sk_buff that can be sprayed for arbitrary write and control-flow hijacking primitives in the kernel heap.\nA:H - Dereferencing the freed skb causes kernel oops/panic, and an unauthenticated peer can trigger the race repeatedly to deny service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "22cba878abf646cd3a02ee7c8c2cef7afe66a256", "versionType": "git"}, {"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "509ab6bfdd0c76daebbad0f0af07da712116de22", "versionType": "git"}, {"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "1071065eeb33d32b7d98c2ce7591881ae7381705", "versionType": "git"}, {"status": "affected", "version": "9d71dd0c70099914fcd063135da3c580865e924c", "lessThan": "2030043e616cab40f510299f09b636285e0a3678", "versionType": "git"}], "programFiles": ["net/can/j1939/transport.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.4"}, {"status": "unaffected", "version": "0", "lessThan": "5.4", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.128", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.46", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.12.13", "versionType": "semver", "lessThanOrEqual": "5.12.*"}, {"status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/can/j1939/transport.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256"}, {"url": "https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22"}, {"url": "https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705"}, {"url": "https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: fix Use-after-Free, hold skb ref while in use\n\nThis patch fixes a Use-after-Free found by the syzbot.\n\nThe problem is that a skb is taken from the per-session skb queue,\nwithout incrementing the ref count. This leads to a Use-after-Free if\nthe skb is taken concurrently from the session queue due to a CTS."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.128", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.46", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.12.13", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.13", "versionStartIncluding": "5.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:46:51.007Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47232", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:46:51.007Z", "dateReserved": "2024-04-10T18:59:19.530Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T14:19:35.084Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"linux_kernel", "vendor": "linux", "versions": [{"status": "affected", "version": "5.4"}]}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8C2A72CA-7A16-4ACC-8D7D-6132A9D8B054", "versionEndExcluding": "5.4.128", "versionStartIncluding": "5.4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "59455D13-A902-42E1-97F7-5ED579777193", "versionEndExcluding": "5.10.46", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7806E7E5-6D4F-4E18-81C1-79B3C60EE855", "versionEndExcluding": "5.12.13", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*", "matchCriteriaId": "DA610E30-717C-4700-9F77-A3C9244F3BFD", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*", "matchCriteriaId": "1ECD33F5-85BE-430B-8F86-8D7BD560311D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*", "matchCriteriaId": "CF351855-2437-4CF5-AD7C-BDFA51F27683", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*", "matchCriteriaId": "25A855BA-2118-44F2-90EF-EBBB12AF51EF", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: fix Use-after-Free, hold skb ref while in use\n\nThis patch fixes a Use-after-Free found by the syzbot.\n\nThe problem is that a skb is taken from the per-session skb queue,\nwithout incrementing the ref count. This leads to a Use-after-Free if\nthe skb is taken concurrently from the session queue due to a CTS."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: j1939: corrige Use-after-Free, mantenga presionada la referencia skb mientras est\u00e1 en uso. Este parche corrige un Use-after-Free encontrado por syzbot. El problema es que se toma un skb de la cola de skb por sesi\u00f3n, sin incrementar el recuento de referencias. Esto conduce a un use after free si el skb se toma simult\u00e1neamente de la cola de sesi\u00f3n debido a un CTS."}], "id": "CVE-2021-47232", "lastModified": "2026-08-04T10:16:53.793", "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": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47232", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-05-28T19:03:26.982947Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:12.557", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: can: j1939: fix Use-after-Free, hold skb ref while in use", "id": "2282585", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282585"}, "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:\ncan: j1939: fix Use-after-Free, hold skb ref while in use\nThis patch fixes a Use-after-Free found by the syzbot.\nThe problem is that a skb is taken from the per-session skb queue,\nwithout incrementing the ref count. This leads to a Use-after-Free if\nthe skb is taken concurrently from the session queue due to a CTS."], "name": "CVE-2021-47232", "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": "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": "Not 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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47232\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47232\nhttps://lore.kernel.org/linux-cve-announce/2024052139-CVE-2021-47232-9022@gregkh/T"], "threat_severity": "Low"}

{}