CVE-2025-68775

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When the\ntimeout is hit on the server, the server will send a FIN, which triggers\na cancellation request via xs_reset_transport(). When the timeout is\nhit on the client, another cancellation request happens via\nxs_tls_handshake_sync().\n\nAdd a test_and_set_bit(HANDSHAKE_F_REQ_COMPLETED) in the pending cancel\npath so duplicate cancels can be detected."}], "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 - An unauthenticated remote client can reach the bug through a network-facing SUNRPC/NFS server by sending an AUTH_TLS NULL probe. TCP receive processing reaches svcauth_tls_accept(), svc_tcp_handshake(), and ultimately duplicate handshake cancellation.\nAC:L - The attacker can create and abandon concurrent AUTH_TLS connections to keep requests pending and drive both timeout and transport-teardown cancellations. No memory-layout guess or uncontrollable race is required.\nPR:N - AUTH_TLS is processed before RPC credentials are authenticated, and the probe requires no established identity, account, or kernel capability.\nUI:N - The server processes the probe, timeout, and socket teardown automatically without victim user action.\nS:U - Exploitation affects the same host-kernel security authority processing the request and does not cross a VM, IOMMU, or comparable security boundary.\nC:H - The extra sock_put() can prematurely free a still-referenced socket, producing a reclaimable kernel use-after-free capable of exposing arbitrary kernel memory.\nI:H - Reclaiming the prematurely freed socket object can provide attacker-controlled data to subsequent kernel accesses, enabling arbitrary modification or control-flow hijacking.\nA:H - The socket use-after-free can cause a kernel oops or panic, while repeated unauthenticated triggers can also leak sockets and exhaust resources."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/handshake/request.c"], "versions": [{"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "lessThan": "011ae80c49d9bfa5b4336f8bd387cd25c7593663", "status": "affected", "versionType": "git"}, {"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "lessThan": "e1641177e7fb48a0a5a06658d4aab51da6656659", "status": "affected", "versionType": "git"}, {"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "lessThan": "3c330f1dee3cd92b57e19b9d21dc8ce5970b09be", "status": "affected", "versionType": "git"}, {"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "lessThan": "15564bd67e2975002f2a8e9defee33e321d3183f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/handshake/request.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.120", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.64", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.3", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19", "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": "6.4", "versionEndExcluding": "6.6.120"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.18.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/011ae80c49d9bfa5b4336f8bd387cd25c7593663"}, {"url": "https://git.kernel.org/stable/c/e1641177e7fb48a0a5a06658d4aab51da6656659"}, {"url": "https://git.kernel.org/stable/c/3c330f1dee3cd92b57e19b9d21dc8ce5970b09be"}, {"url": "https://git.kernel.org/stable/c/15564bd67e2975002f2a8e9defee33e321d3183f"}], "title": "net/handshake: duplicate handshake cancellations leak socket", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-68775", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:05:12.016818Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-662", "description": "CWE-662 Improper Synchronization"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T18:05:06.829Z"}}]}}

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TCP receive processing reaches svcauth_tls_accept(), svc_tcp_handshake(), and ultimately duplicate handshake cancellation.\nAC:L - The attacker can create and abandon concurrent AUTH_TLS connections to keep requests pending and drive both timeout and transport-teardown cancellations. No memory-layout guess or uncontrollable race is required.\nPR:N - AUTH_TLS is processed before RPC credentials are authenticated, and the probe requires no established identity, account, or kernel capability.\nUI:N - The server processes the probe, timeout, and socket teardown automatically without victim user action.\nS:U - Exploitation affects the same host-kernel security authority processing the request and does not cross a VM, IOMMU, or comparable security boundary.\nC:H - The extra sock_put() can prematurely free a still-referenced socket, producing a reclaimable kernel use-after-free capable of exposing arbitrary kernel memory.\nI:H - Reclaiming the prematurely freed socket object can provide attacker-controlled data to subsequent kernel accesses, enabling arbitrary modification or control-flow hijacking.\nA:H - The socket use-after-free can cause a kernel oops or panic, while repeated unauthenticated triggers can also leak sockets and exhaust resources."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "lessThan": "011ae80c49d9bfa5b4336f8bd387cd25c7593663", "versionType": "git"}, {"status": "affected", "version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "lessThan": "e1641177e7fb48a0a5a06658d4aab51da6656659", "versionType": "git"}, {"status": "affected", "version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "lessThan": "3c330f1dee3cd92b57e19b9d21dc8ce5970b09be", "versionType": "git"}, {"status": "affected", "version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "lessThan": "15564bd67e2975002f2a8e9defee33e321d3183f", "versionType": "git"}], "programFiles": ["net/handshake/request.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"status": "unaffected", "version": "0", "lessThan": "6.4", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.120", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.64", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.3", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/handshake/request.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/011ae80c49d9bfa5b4336f8bd387cd25c7593663"}, {"url": "https://git.kernel.org/stable/c/e1641177e7fb48a0a5a06658d4aab51da6656659"}, {"url": "https://git.kernel.org/stable/c/3c330f1dee3cd92b57e19b9d21dc8ce5970b09be"}, {"url": "https://git.kernel.org/stable/c/15564bd67e2975002f2a8e9defee33e321d3183f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/handshake: duplicate handshake cancellations leak socket\n\nWhen a handshake request is cancelled it is removed from the\nhandshake_net->hn_requests list, but it is still present in the\nhandshake_rhashtbl until it is destroyed.\n\nIf a second cancellation request arrives for the same handshake request,\nthen remove_pending() will return false... and assuming\nHANDSHAKE_F_REQ_COMPLETED isn't set in req->hr_flags, we'll continue\nprocessing through the out_true label, where we put another reference on\nthe sock and a refcount underflow occurs.\n\nThis can happen for example if a handshake times out - particularly if\nthe SUNRPC client sends the AUTH_TLS probe to the server but doesn't\nfollow it up with the ClientHello due to a problem with tlshd. When the\ntimeout is hit on the server, the server will send a FIN, which triggers\na cancellation request via xs_reset_transport(). When the timeout is\nhit on the client, another cancellation request happens via\nxs_tls_handshake_sync().\n\nAdd a test_and_set_bit(HANDSHAKE_F_REQ_COMPLETED) in the pending cancel\npath so duplicate cancels can be detected."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.120", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.64", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.3", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19", "versionStartIncluding": "6.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:11:25.376Z"}}}, "cveMetadata": {"cveId": "CVE-2025-68775", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:05:06.829Z", "dateReserved": "2025-12-24T10:30:51.035Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-01-13T15:28:52.069Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/handshake/request.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "011ae80c49d9bfa5b4336f8bd387cd25c7593663", "status": "affected", "version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "versionType": "git"}, {"lessThan": "e1641177e7fb48a0a5a06658d4aab51da6656659", "status": "affected", "version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "versionType": "git"}, {"lessThan": "3c330f1dee3cd92b57e19b9d21dc8ce5970b09be", "status": "affected", "version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "versionType": "git"}, {"lessThan": "15564bd67e2975002f2a8e9defee33e321d3183f", "status": "affected", "version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/handshake/request.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"lessThan": "6.4", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.120", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.64", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.19", "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\nnet/handshake: duplicate handshake cancellations leak socket\n\nWhen a handshake request is cancelled it is removed from the\nhandshake_net->hn_requests list, but it is still present in the\nhandshake_rhashtbl until it is destroyed.\n\nIf a second cancellation request arrives for the same handshake request,\nthen remove_pending() will return false... and assuming\nHANDSHAKE_F_REQ_COMPLETED isn't set in req->hr_flags, we'll continue\nprocessing through the out_true label, where we put another reference on\nthe sock and a refcount underflow occurs.\n\nThis can happen for example if a handshake times out - particularly if\nthe SUNRPC client sends the AUTH_TLS probe to the server but doesn't\nfollow it up with the ClientHello due to a problem with tlshd. When the\ntimeout is hit on the server, the server will send a FIN, which triggers\na cancellation request via xs_reset_transport(). When the timeout is\nhit on the client, another cancellation request happens via\nxs_tls_handshake_sync().\n\nAdd a test_and_set_bit(HANDSHAKE_F_REQ_COMPLETED) in the pending cancel\npath so duplicate cancels can be detected."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/handshake: las cancelaciones duplicadas de handshake fugan el socket\n\nCuando una solicitud de handshake es cancelada, es eliminada de la lista handshake_net->hn_requests, pero a\u00fan est\u00e1 presente en la handshake_rhashtbl hasta que es destruida.\n\nSi llega una segunda solicitud de cancelaci\u00f3n para la misma solicitud de handshake, entonces remove_pending() devolver\u00e1 falso... y asumiendo que HANDSHAKE_F_REQ_COMPLETED no est\u00e1 establecido en req->hr_flags, continuaremos procesando a trav\u00e9s de la etiqueta out_true, donde ponemos otra referencia en el sock y ocurre un desbordamiento negativo del contador de referencias.\n\nEsto puede ocurrir por ejemplo si un handshake agota el tiempo de espera, particularmente si el cliente SUNRPC env\u00eda la sonda AUTH_TLS al servidor pero no la sigue con el ClientHello debido a un problema con tlshd. Cuando se alcanza el tiempo de espera en el servidor, el servidor enviar\u00e1 un FIN, lo que activa una solicitud de cancelaci\u00f3n a trav\u00e9s de xs_reset_transport(). Cuando se alcanza el tiempo de espera en el cliente, ocurre otra solicitud de cancelaci\u00f3n a trav\u00e9s de xs_tls_handshake_sync().\n\nA\u00f1adir un test_and_set_bit(HANDSHAKE_F_REQ_COMPLETED) en la ruta de cancelaci\u00f3n pendiente para que las cancelaciones duplicadas puedan ser detectadas."}], "id": "CVE-2025-68775", "lastModified": "2026-10-19T19:17:04.537", "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-2025-68775", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:05:12.016818Z", "version": "2.0.3"}}]}, "published": "2026-01-13T16:15:57.073", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/011ae80c49d9bfa5b4336f8bd387cd25c7593663"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/15564bd67e2975002f2a8e9defee33e321d3183f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3c330f1dee3cd92b57e19b9d21dc8ce5970b09be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e1641177e7fb48a0a5a06658d4aab51da6656659"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-662"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net/handshake: duplicate handshake cancellations leak socket", "id": "2429063", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429063"}, "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:\nnet/handshake: duplicate handshake cancellations leak socket\nWhen a handshake request is cancelled it is removed from the\nhandshake_net->hn_requests list, but it is still present in the\nhandshake_rhashtbl until it is destroyed.\nIf a second cancellation request arrives for the same handshake request,\nthen remove_pending() will return false... and assuming\nHANDSHAKE_F_REQ_COMPLETED isn't set in req->hr_flags, we'll continue\nprocessing through the out_true label, where we put another reference on\nthe sock and a refcount underflow occurs.\nThis can happen for example if a handshake times out - particularly if\nthe SUNRPC client sends the AUTH_TLS probe to the server but doesn't\nfollow it up with the ClientHello due to a problem with tlshd. When the\ntimeout is hit on the server, the server will send a FIN, which triggers\na cancellation request via xs_reset_transport(). When the timeout is\nhit on the client, another cancellation request happens via\nxs_tls_handshake_sync().\nAdd a test_and_set_bit(HANDSHAKE_F_REQ_COMPLETED) in the pending cancel\npath so duplicate cancels can be detected."], "name": "CVE-2025-68775", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-68775\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-68775\nhttps://lore.kernel.org/linux-cve-announce/2026011359-CVE-2025-68775-6e68@gregkh/T"], "threat_severity": "Low"}

{}