CVE-2021-47248

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Both\nracing functions acquire the socket lock, but udp{v6}_destroy_sock()\nrelease it before performing destructive actions.\n\nWe can't easily extend the socket lock scope to avoid the race,\ninstead use the SOCK_DEAD flag to prevent udp_abort from doing\nany action when the critical race happens.\n\nDiagnosed-and-tested-by: Kaustubh Pandey <kapandey@codeaurora.org>"}], "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 - Exploitation requires local netlink SOCK_DESTROY (inet_diag) plus close() on a UDP socket; the vulnerable path is not reachable from received network packets alone.\nAC:L - The attacker controls both sides of the race by concurrently calling close() and issuing SOCK_DESTROY on a UDP socket they create (e.g., bind to INADDR_ANY with an explicit port so __udp_disconnect triggers udp_lib_rehash).\nPR:L - sock_diag_destroy requires CAP_NET_ADMIN in the socket\u2019s network namespace user_ns, which an unprivileged process obtains via user+net namespaces (unshare -Urn); it does not require init-namespace root.\nUI:N - No victim action is required; the attacker triggers both close() and SOCK_DESTROY themselves.\nS:U - Impact is confined to the local kernel\u2019s UDP socket/hash state and does not cross a VM, IOMMU, or other security authority boundary.\nC:H - The race is a confirmed use-after-free: the socket can be rehashed then freed, leaving a dangling udp_portaddr_node that lookups dereference, which can be leveraged for arbitrary kernel read primitives.\nI:H - The same UAF/hash-list corruption enables heap reuse and control of the freed sock object, supporting arbitrary write and control-flow hijacking in the kernel.\nA:H - The bug manifests as a kernel panic/oops in udp4_lib_lookup2 when the dangling hash node is walked, fully disrupting system availability."}]}], "affected": [{"product": "Linux", 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the vulnerable path is not reachable from received network packets alone.\nAC:L - The attacker controls both sides of the race by concurrently calling close() and issuing SOCK_DESTROY on a UDP socket they create (e.g., bind to INADDR_ANY with an explicit port so __udp_disconnect triggers udp_lib_rehash).\nPR:L - sock_diag_destroy requires CAP_NET_ADMIN in the socket\u2019s network namespace user_ns, which an unprivileged process obtains via user+net namespaces (unshare -Urn); it does not require init-namespace root.\nUI:N - No victim action is required; the attacker triggers both close() and SOCK_DESTROY themselves.\nS:U - Impact is confined to the local kernel\u2019s UDP socket/hash state and does not cross a VM, IOMMU, or other security authority boundary.\nC:H - The race is a confirmed use-after-free: the socket can be rehashed then freed, leaving a dangling udp_portaddr_node that lookups dereference, which can be leveraged for arbitrary kernel read primitives.\nI:H - The same UAF/hash-list corruption enables heap reuse and control of the freed sock object, supporting arbitrary write and control-flow hijacking in the kernel.\nA:H - The bug manifests as a kernel panic/oops in udp4_lib_lookup2 when the dangling hash node is walked, fully disrupting system availability."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5d77dca82839ef016a93ad7acd7058b14d967752", "lessThan": "e3c36c773aed0fef8b1d3d555b43393ec564400f", "versionType": "git"}, {"status": "affected", "version": "5d77dca82839ef016a93ad7acd7058b14d967752", "lessThan": "a0882f68f54f7a8b6308261acee9bd4faab5a69e", "versionType": "git"}, {"status": "affected", "version": "5d77dca82839ef016a93ad7acd7058b14d967752", "lessThan": "2f73448041bd0682d4b552cfd314ace66107f1ad", "versionType": "git"}, {"status": "affected", "version": "5d77dca82839ef016a93ad7acd7058b14d967752", "lessThan": "5a88477c1c85e4baa51e91f2d40f2166235daa56", "versionType": "git"}, {"status": "affected", "version": "5d77dca82839ef016a93ad7acd7058b14d967752", "lessThan": "8729ec8a2238152a4afc212a331a6cd2c61aeeac", "versionType": "git"}, {"status": "affected", "version": "5d77dca82839ef016a93ad7acd7058b14d967752", "lessThan": "65310b0aff86980a011c7c7bfa487a333d4ca241", "versionType": "git"}, {"status": "affected", "version": "5d77dca82839ef016a93ad7acd7058b14d967752", "lessThan": "a8b897c7bcd47f4147d066e22cc01d1026d7640e", "versionType": "git"}], "programFiles": ["net/ipv4/udp.c", "net/ipv6/udp.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.9"}, {"status": "unaffected", "version": "0", "lessThan": "4.9", "versionType": "semver"}, {"status": "unaffected", "version": "4.9.274", "versionType": "semver", "lessThanOrEqual": "4.9.*"}, {"status": "unaffected", "version": "4.14.238", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.196", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"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/ipv4/udp.c", "net/ipv6/udp.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400f"}, {"url": "https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69e"}, {"url": "https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1ad"}, {"url": "https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56"}, {"url": "https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeac"}, {"url": "https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241"}, {"url": "https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640e"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: fix race between close() and udp_abort()\n\nKaustubh reported and diagnosed a panic in udp_lib_lookup().\nThe root cause is udp_abort() racing with close(). 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Both\nracing functions acquire the socket lock, but udp{v6}_destroy_sock()\nrelease it before performing destructive actions.\n\nWe can't easily extend the socket lock scope to avoid the race,\ninstead use the SOCK_DEAD flag to prevent udp_abort from doing\nany action when the critical race happens.\n\nDiagnosed-and-tested-by: Kaustubh Pandey <kapandey@codeaurora.org>"}, {"lang": "es", "value": " En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: udp: corrige la ejecuci\u00f3n entre close() y udp_abort(). Kaustubh inform\u00f3 y diagnostic\u00f3 un p\u00e1nico en udp_lib_lookup(). La causa principal es que udp_abort() compite con close(). Ambas funciones de ejecuci\u00f3n adquieren el bloqueo del socket, pero udp{v6}_destroy_sock() lo libera antes de realizar acciones destructivas. No podemos extender f\u00e1cilmente el alcance del bloqueo del socket para evitar la ejecuci\u00f3n; en su lugar, usamos el indicador SOCK_DEAD para evitar que udp_abort realice alguna acci\u00f3n cuando ocurre la ejecuci\u00f3n cr\u00edtica. Diagnosticado y probado por: Kaustubh Pandey "}], "id": "CVE-2021-47248", "lastModified": "2026-08-04T10:16:55.090", "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-2021-47248", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-23T18:04:43.420239Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:13.780", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1ad"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeac"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: udp: fix race between close() and udp_abort()", "id": "2282564", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282564"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nudp: fix race between close() and udp_abort()\nKaustubh reported and diagnosed a panic in udp_lib_lookup().\nThe root cause is udp_abort() racing with close(). Both\nracing functions acquire the socket lock, but udp{v6}_destroy_sock()\nrelease it before performing destructive actions.\nWe can't easily extend the socket lock scope to avoid the race,\ninstead use the SOCK_DEAD flag to prevent udp_abort from doing\nany action when the critical race happens.\nDiagnosed-and-tested-by: Kaustubh Pandey <kapandey@codeaurora.org>", "A vulnerability was found in the Linux kernel's UDP implementation, where a race condition exists between the close() and udp_abort() functions. This race can cause a system panic during socket operations, leading to unexpected crashes"], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47248", "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:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47248\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47248\nhttps://lore.kernel.org/linux-cve-announce/2024052143-CVE-2021-47248-2609@gregkh/T"], "statement": "This vulnerability is rated as a moderate severity because this issue results in system crashes under specific conditions and exploitation requires precise timing.", "threat_severity": "Moderate"}

{}