CVE-2023-54269

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No local access is needed; the attacker only sends network packets to the NFS server.\nAC:L - The attacker controls both deferral triggers \u2014 a novel (freely spoofable) UDP source address forces an ip_map cache miss, and an unresolved export/filehandle forces a second nfsd_fh/nfsd_export miss on the same request, which is exactly the first-contact sequence for a new client. Small datagrams stay linear so rq_xprt_ctxt is populated, making the trigger repeatable at will.\nPR:N - The deferrals occur inside svcauth_unix_set_client() and the export lookup, i.e. while the server is still deciding whether the client is permitted at all, so no credentials have been verified. AUTH_NULL/AUTH_UNIX requests from any host able to reach the nfsd port suffice.\nUI:N - nfsd threads process incoming RPCs and requeue deferred requests automatically with no action by any local user or administrator.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed sk_buff is re-read and re-released (skb->users, skb->head, skb->destructor) and the double free returns the same slab object to two owners, giving type-confusion-based read primitives over adjacent kernel data. Per UAF guidance this is High.\nI:H - A double free of an sk_buff lets a remote attacker who reallocates the slot with sprayed packet data control fields such as skb->destructor and skb->head, yielding arbitrary write / control-flow hijack; the RDMA variant double-adds a recv ctxt to the free list so two live receives share one DMA buffer.\nA:H - The commit itself notes the second free \"is likely to oops\"; a double free of an sk_buff or corruption of the RDMA recv ctxt free list panics the kernel and can be re-triggered repeatedly by an unauthenticated remote client."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/svc_xprt.c"], "versions": [{"version": "f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d", "lessThan": "7851771789e87108a92697194105ef0c9307dc5e", "status": "affected", "versionType": "git"}, {"version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "lessThan": "fd86534872f445f54dc01e7db001e25eadf063a8", "status": "affected", "versionType": "git"}, {"version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "lessThan": "e0c648627322a4c7e018e5c7f837c3c03e297dbb", "status": "affected", "versionType": "git"}, {"version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "lessThan": "eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1", "status": "affected", "versionType": "git"}, {"version": "11fab500f86403b2ebf6795feeade6e10302e448", "status": "affected", "versionType": "git"}, {"version": "5.15.35", "lessThan": "5.15.113", "status": "affected", "versionType": "semver"}, {"version": "5.17.4", "lessThan": "5.18", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/svc_xprt.c"], "versions": [{"version": "5.18", "status": "affected"}, {"version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.113", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.30", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.3.4", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.4", "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": "5.15.35", "versionEndExcluding": "5.15.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.1.30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.3.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17.4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e"}, {"url": "https://git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8"}, {"url": "https://git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb"}, {"url": "https://git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1"}], "title": "SUNRPC: double free xprt_ctxt while still in use", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-54269", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:39:56.402453Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:43.730Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-54269", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:39:56.402453Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:39:57.235Z"}}], "cna": {"title": "SUNRPC: double free xprt_ctxt while still in use", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable path is nfsd/sunrpc server-side request processing driven entirely by RPC datagrams received from remote clients over UDP port 2049 (or NFS/RDMA). No local access is needed; the attacker only sends network packets to the NFS server.\nAC:L - The attacker controls both deferral triggers \u2014 a novel (freely spoofable) UDP source address forces an ip_map cache miss, and an unresolved export/filehandle forces a second nfsd_fh/nfsd_export miss on the same request, which is exactly the first-contact sequence for a new client. Small datagrams stay linear so rq_xprt_ctxt is populated, making the trigger repeatable at will.\nPR:N - The deferrals occur inside svcauth_unix_set_client() and the export lookup, i.e. while the server is still deciding whether the client is permitted at all, so no credentials have been verified. AUTH_NULL/AUTH_UNIX requests from any host able to reach the nfsd port suffice.\nUI:N - nfsd threads process incoming RPCs and requeue deferred requests automatically with no action by any local user or administrator.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed sk_buff is re-read and re-released (skb->users, skb->head, skb->destructor) and the double free returns the same slab object to two owners, giving type-confusion-based read primitives over adjacent kernel data. Per UAF guidance this is High.\nI:H - A double free of an sk_buff lets a remote attacker who reallocates the slot with sprayed packet data control fields such as skb->destructor and skb->head, yielding arbitrary write / control-flow hijack; the RDMA variant double-adds a recv ctxt to the free list so two live receives share one DMA buffer.\nA:H - The commit itself notes the second free \"is likely to oops\"; a double free of an sk_buff or corruption of the RDMA recv ctxt free list panics the kernel and can be re-triggered repeatedly by an unauthenticated remote client."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d", "lessThan": "7851771789e87108a92697194105ef0c9307dc5e", "versionType": "git"}, {"status": "affected", "version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "lessThan": "fd86534872f445f54dc01e7db001e25eadf063a8", "versionType": "git"}, {"status": "affected", "version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "lessThan": "e0c648627322a4c7e018e5c7f837c3c03e297dbb", "versionType": "git"}, {"status": "affected", "version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "lessThan": "eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1", "versionType": "git"}, {"status": "affected", "version": "11fab500f86403b2ebf6795feeade6e10302e448", "versionType": "git"}, {"status": "affected", "version": "5.15.35", "lessThan": "5.15.113", "versionType": "semver"}, {"status": "affected", "version": "5.17.4", "lessThan": "5.18", "versionType": "semver"}], "programFiles": ["net/sunrpc/svc_xprt.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"status": "unaffected", "version": "0", "lessThan": "5.18", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.113", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.30", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.3.4", "versionType": "semver", "lessThanOrEqual": "6.3.*"}, {"status": "unaffected", "version": "6.4", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sunrpc/svc_xprt.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e"}, {"url": "https://git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8"}, {"url": "https://git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb"}, {"url": "https://git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: double free xprt_ctxt while still in use\n\nWhen an RPC request is deferred, the rq_xprt_ctxt pointer is moved out\nof the svc_rqst into the svc_deferred_req.\nWhen the deferred request is revisited, the pointer is copied into\nthe new svc_rqst - and also remains in the svc_deferred_req.\n\nIn the (rare?) case that the request is deferred a second time, the old\nsvc_deferred_req is reused - it still has all the correct content.\nHowever in that case the rq_xprt_ctxt pointer is NOT cleared so that\nwhen xpo_release_xprt is called, the ctxt is freed (UDP) or possible\nadded to a free list (RDMA).\nWhen the deferred request is revisited for a second time, it will\nreference this ctxt which may be invalid, and the free the object a\nsecond time which is likely to oops.\n\nSo change svc_defer() to *always* clear rq_xprt_ctxt, and assert that\nthe value is now stored in the svc_deferred_req."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.113", "versionStartIncluding": "5.15.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.30", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.3.4", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.4", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.17.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:18:46.870Z"}}}, "cveMetadata": {"cveId": "CVE-2023-54269", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:41:43.730Z", "dateReserved": "2025-12-30T12:06:44.518Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-12-30T12:16:00.317Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sunrpc/svc_xprt.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7851771789e87108a92697194105ef0c9307dc5e", "status": "affected", "version": "f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d", "versionType": "git"}, {"lessThan": "fd86534872f445f54dc01e7db001e25eadf063a8", "status": "affected", "version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "versionType": "git"}, {"lessThan": "e0c648627322a4c7e018e5c7f837c3c03e297dbb", "status": "affected", "version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "versionType": "git"}, {"lessThan": "eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1", "status": "affected", "version": "773f91b2cf3f52df0d7508fdbf60f37567cdaee4", "versionType": "git"}, {"status": "affected", "version": "11fab500f86403b2ebf6795feeade6e10302e448", "versionType": "git"}, {"lessThan": "5.15.113", "status": "affected", "version": "5.15.35", "versionType": "semver"}, {"lessThan": "5.18", "status": "affected", "version": "5.17.4", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sunrpc/svc_xprt.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"lessThan": "5.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.113", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.30", "versionType": "semver"}, {"lessThanOrEqual": "6.3.*", "status": "unaffected", "version": "6.3.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.4", "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\nSUNRPC: double free xprt_ctxt while still in use\n\nWhen an RPC request is deferred, the rq_xprt_ctxt pointer is moved out\nof the svc_rqst into the svc_deferred_req.\nWhen the deferred request is revisited, the pointer is copied into\nthe new svc_rqst - and also remains in the svc_deferred_req.\n\nIn the (rare?) case that the request is deferred a second time, the old\nsvc_deferred_req is reused - it still has all the correct content.\nHowever in that case the rq_xprt_ctxt pointer is NOT cleared so that\nwhen xpo_release_xprt is called, the ctxt is freed (UDP) or possible\nadded to a free list (RDMA).\nWhen the deferred request is revisited for a second time, it will\nreference this ctxt which may be invalid, and the free the object a\nsecond time which is likely to oops.\n\nSo change svc_defer() to *always* clear rq_xprt_ctxt, and assert that\nthe value is now stored in the svc_deferred_req."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nSUNRPC: doble liberaci\u00f3n de xprt_ctxt mientras a\u00fan est\u00e1 en uso\n\nCuando una solicitud RPC es diferida, el puntero rq_xprt_ctxt es movido fuera del svc_rqst hacia el svc_deferred_req.\nCuando la solicitud diferida es revisitada, el puntero es copiado en el nuevo svc_rqst - y tambi\u00e9n permanece en el svc_deferred_req.\n\nEn el caso (\u00bfraro?) de que la solicitud sea diferida por segunda vez, el antiguo svc_deferred_req es reutilizado - a\u00fan tiene todo el contenido correcto.\nSin embargo, en ese caso el puntero rq_xprt_ctxt NO es limpiado de modo que cuando se llama a xpo_release_xprt, el ctxt es liberado (UDP) o posiblemente a\u00f1adido a una lista de libres (RDMA).\nCuando la solicitud diferida es revisitada por segunda vez, har\u00e1 referencia a este ctxt el cual puede ser inv\u00e1lido, y liberar\u00e1 el objeto por segunda vez lo que probablemente causar\u00e1 un 'oops'.\n\nAs\u00ed que cambie svc_defer() para *siempre* limpiar rq_xprt_ctxt, y afirme que el valor ahora est\u00e1 almacenado en el svc_deferred_req."}], "id": "CVE-2023-54269", "lastModified": "2026-10-15T22:17:57.140", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-54269", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:39:56.402453Z", "version": "2.0.3"}}]}, "published": "2025-12-30T13:16:15.737", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7851771789e87108a92697194105ef0c9307dc5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e0c648627322a4c7e018e5c7f837c3c03e297dbb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fd86534872f445f54dc01e7db001e25eadf063a8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: SUNRPC: double free xprt_ctxt while still in use", "id": "2426013", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2426013"}, "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": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nSUNRPC: double free xprt_ctxt while still in use\nWhen an RPC request is deferred, the rq_xprt_ctxt pointer is moved out\nof the svc_rqst into the svc_deferred_req.\nWhen the deferred request is revisited, the pointer is copied into\nthe new svc_rqst - and also remains in the svc_deferred_req.\nIn the (rare?) case that the request is deferred a second time, the old\nsvc_deferred_req is reused - it still has all the correct content.\nHowever in that case the rq_xprt_ctxt pointer is NOT cleared so that\nwhen xpo_release_xprt is called, the ctxt is freed (UDP) or possible\nadded to a free list (RDMA).\nWhen the deferred request is revisited for a second time, it will\nreference this ctxt which may be invalid, and the free the object a\nsecond time which is likely to oops.\nSo change svc_defer() to *always* clear rq_xprt_ctxt, and assert that\nthe value is now stored in the svc_deferred_req."], "name": "CVE-2023-54269", "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": "Under investigation", "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": "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": "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": "2025-12-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-54269\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-54269\nhttps://lore.kernel.org/linux-cve-announce/2025123000-CVE-2023-54269-6fd7@gregkh/T"], "threat_severity": "Important"}

{}