CVE-2021-47669

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The bug is in vxcan_xmit, reached by sending a CAN frame on a virtual vxcan interface via PF_CAN/SOCK_RAW and RTNL setup\u2014local syscalls/netlink only, not remote packet processing.\nAC:L - netif_rx_ni() runs softirq immediately and can_receive() always consume_skb()s the delivered frame, so the post-rx cfd->len access is a reliable use-after-free with no race or uncontrolled condition.\nPR:L - Creating/bringing up vxcan requires CAP_NET_ADMIN, which an unprivileged user obtains via user+network namespaces (unshare -Urn); sending on an existing up interface needs no capability.\nUI:N - The attacker creates the vxcan pair, brings it up, and sends frames entirely on their own\u2014no victim interaction is required.\nS:U - Impact is confined to the local kernel (memory corruption / privilege escalation within the same security authority); this is not a VM/IOMMU/sandbox boundary escape.\nC:H - This is a use-after-free of skb data after delivery; a dangling read of freed heap enables disclosure of reclaimed object contents (including via stats that incorporate the stale byte).\nI:H - Use-after-free of the skb data buffer is exploitable via heap reuse/spray for corruption and control-flow hijacking primitives beyond the immediate stats update.\nA:H - Dereferencing freed skb data can oops/panic the kernel when the page is reclaimed or unmapped, and UAF faults are reliably triggerable on the success path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/can/vxcan.c"], "versions": [{"version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105", "status": "affected", "versionType": "git"}, {"version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "9b820875a32a3443d67bfd368e93038354e98052", "status": "affected", "versionType": "git"}, {"version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "a24476b37167816e6352ca1a2cf3769847774f70", "status": "affected", "versionType": "git"}, {"version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "e771a874076115df8bff27d325edfd2340e4ec69", "status": "affected", "versionType": "git"}, {"version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "75854cad5d80976f6ea0f0431f8cedd3bcc475cb", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/can/vxcan.c"], "versions": [{"version": "4.12", "status": "affected"}, {"version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.218", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.171", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.93", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.11", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.11", "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": "4.12", "versionEndExcluding": "4.14.218"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "4.19.171"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.4.93"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.10.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105"}, {"url": "https://git.kernel.org/stable/c/9b820875a32a3443d67bfd368e93038354e98052"}, {"url": "https://git.kernel.org/stable/c/a24476b37167816e6352ca1a2cf3769847774f70"}, {"url": "https://git.kernel.org/stable/c/e771a874076115df8bff27d325edfd2340e4ec69"}, {"url": "https://git.kernel.org/stable/c/75854cad5d80976f6ea0f0431f8cedd3bcc475cb"}], "title": "can: vxcan: vxcan_xmit: fix use after free bug", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2021-47669", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-04-17T18:17:52.149604Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-17T18:25:25.277Z"}}]}}

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sending on an existing up interface needs no capability.\nUI:N - The attacker creates the vxcan pair, brings it up, and sends frames entirely on their own\u2014no victim interaction is required.\nS:U - Impact is confined to the local kernel (memory corruption / privilege escalation within the same security authority); this is not a VM/IOMMU/sandbox boundary escape.\nC:H - This is a use-after-free of skb data after delivery; a dangling read of freed heap enables disclosure of reclaimed object contents (including via stats that incorporate the stale byte).\nI:H - Use-after-free of the skb data buffer is exploitable via heap reuse/spray for corruption and control-flow hijacking primitives beyond the immediate stats update.\nA:H - Dereferencing freed skb data can oops/panic the kernel when the page is reclaimed or unmapped, and UAF faults are reliably triggerable on the success path."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105", "versionType": "git"}, {"status": "affected", "version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "9b820875a32a3443d67bfd368e93038354e98052", "versionType": "git"}, {"status": "affected", "version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "a24476b37167816e6352ca1a2cf3769847774f70", "versionType": "git"}, {"status": "affected", "version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "e771a874076115df8bff27d325edfd2340e4ec69", "versionType": "git"}, {"status": "affected", "version": "a8f820a380a2a06fc4fe1a54159067958f800929", "lessThan": "75854cad5d80976f6ea0f0431f8cedd3bcc475cb", "versionType": "git"}], "programFiles": ["drivers/net/can/vxcan.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.12"}, {"status": "unaffected", "version": "0", "lessThan": "4.12", "versionType": "semver"}, {"status": "unaffected", "version": "4.14.218", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.171", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.93", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.11", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.11", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/can/vxcan.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105"}, {"url": "https://git.kernel.org/stable/c/9b820875a32a3443d67bfd368e93038354e98052"}, {"url": "https://git.kernel.org/stable/c/a24476b37167816e6352ca1a2cf3769847774f70"}, {"url": "https://git.kernel.org/stable/c/e771a874076115df8bff27d325edfd2340e4ec69"}, {"url": "https://git.kernel.org/stable/c/75854cad5d80976f6ea0f0431f8cedd3bcc475cb"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: vxcan: vxcan_xmit: fix use after free bug\n\nAfter calling netif_rx_ni(skb), dereferencing skb is unsafe.\nEspecially, the canfd_frame cfd which aliases skb memory is accessed\nafter the netif_rx_ni()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.14.218", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.171", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.93", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.11", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.11", "versionStartIncluding": "4.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:49.266Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47669", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:48:49.266Z", "dateReserved": "2025-04-16T07:16:05.752Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-04-17T18:01:29.979Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Tras llamar a netif_rx_ni(skb), desreferenciar skb no es seguro. En particular, se accede al cfd canfd_frame, que crea un alias de memoria skb, despu\u00e9s de netif_rx_ni()."}], "id": "CVE-2021-47669", "lastModified": "2026-06-17T04:18:17.140", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47669", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-04-17T18:17:52.149604Z", "version": "2.0.3"}}]}, "published": "2025-04-17T18:15:43.730", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/75854cad5d80976f6ea0f0431f8cedd3bcc475cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9b820875a32a3443d67bfd368e93038354e98052"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a24476b37167816e6352ca1a2cf3769847774f70"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e771a874076115df8bff27d325edfd2340e4ec69"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: can: vxcan: vxcan_xmit: fix use after free bug", "id": "2360787", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2360787"}, "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"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncan: vxcan: vxcan_xmit: fix use after free bug\nAfter calling netif_rx_ni(skb), dereferencing skb is unsafe.\nEspecially, the canfd_frame cfd which aliases skb memory is accessed\nafter the netif_rx_ni()."], "name": "CVE-2021-47669", "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": "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": "2025-04-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47669\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47669\nhttps://lore.kernel.org/linux-cve-announce/2025041734-CVE-2021-47669-f268@gregkh/T"], "threat_severity": "Moderate"}

{}