CVE-2026-68161

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The netns exit path does not stop these sockets, so a namespace\ncan be torn down while its SCTP UDP tunnel sockets are still installed.\n\nClose the UDP tunnel sockets from sctp_ctrlsock_exit() after unregistering\nthe per-net sysctl table. This prevents new sysctl writes from racing in\nwhile the sockets are being released, and closes the sockets before the\ncontrol socket is destroyed."}], "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 - Stale SCTP UDP tunnel sockets left installed after netns teardown still receive remote SCTP-over-UDP (RFC 6951) on the configured net.sctp.udp_port; packets enter sctp_udp_rcv\u2192sctp_rcv in softirq and touch freed per-net SCTP/UDP state.\nAC:L - An attacker can repeatedly race namespace deletion against SCTP-over-UDP traffic they send or receive, controlling both teardown timing and packet delivery; no attacker-uncontrollable memory layout or rare kernel config is required beyond SCTP being enabled.\nPR:N - On SCTP-over-UDP deployments where net.sctp.udp_port is already configured, any remote SCTP peer needs no credentials on the target; alternatively an unprivileged local user obtains CAP_NET_ADMIN via user namespaces to set udp_port and destroy the namespace.\nUI:N - Exploitation requires only attacker-driven SCTP-over-UDP traffic and namespace lifecycle events (e.g., container restart); no victim must mount a filesystem, open a file, or take any separate interactive action.\nS:U - Impact is host-kernel slab use-after-free and memory corruption within the same OS security authority; it does not cross VM, IOMMU, or sandbox boundaries to affect a separate security domain.\nC:H - Use-after-free of struct net and SCTP UDP tunnel socket state lets an attacker influence freed slab contents and obtain arbitrary kernel memory read primitives through subsequent SCTP/UDP lookups and socket processing.\nI:H - The UAF enables heap grooming and reuse of freed per-net/socket objects in SCTP/UDP handlers, supporting arbitrary kernel writes and control-flow hijack typical of slab use-after-free exploitation.\nA:H - Dereferencing SCTP/UDP tunnel sockets and per-net state after netns free causes slab use-after-free detections, kernel oops, or panic; 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packets enter sctp_udp_rcv\u2192sctp_rcv in softirq and touch freed per-net SCTP/UDP state.\nAC:L - An attacker can repeatedly race namespace deletion against SCTP-over-UDP traffic they send or receive, controlling both teardown timing and packet delivery; no attacker-uncontrollable memory layout or rare kernel config is required beyond SCTP being enabled.\nPR:N - On SCTP-over-UDP deployments where net.sctp.udp_port is already configured, any remote SCTP peer needs no credentials on the target; alternatively an unprivileged local user obtains CAP_NET_ADMIN via user namespaces to set udp_port and destroy the namespace.\nUI:N - Exploitation requires only attacker-driven SCTP-over-UDP traffic and namespace lifecycle events (e.g., container restart); no victim must mount a filesystem, open a file, or take any separate interactive action.\nS:U - Impact is host-kernel slab use-after-free and memory corruption within the same OS security authority; it does not cross VM, IOMMU, or sandbox boundaries to affect a separate security domain.\nC:H - Use-after-free of struct net and SCTP UDP tunnel socket state lets an attacker influence freed slab contents and obtain arbitrary kernel memory read primitives through subsequent SCTP/UDP lookups and socket processing.\nI:H - The UAF enables heap grooming and reuse of freed per-net/socket objects in SCTP/UDP handlers, supporting arbitrary kernel writes and control-flow hijack typical of slab use-after-free exploitation.\nA:H - Dereferencing SCTP/UDP tunnel sockets and per-net state after netns free causes slab use-after-free detections, kernel oops, or panic; 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The netns exit path does not stop these sockets, so a namespace\ncan be torn down while its SCTP UDP tunnel sockets are still installed.\n\nClose the UDP tunnel sockets from sctp_ctrlsock_exit() after unregistering\nthe per-net sysctl table. This prevents new sysctl writes from racing in\nwhile the sockets are being released, and closes the sockets before the\ncontrol socket is destroyed."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.189", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.151", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:55:39.636Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68161", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:58:55.541Z", "dateReserved": "2026-07-30T09:28:09.372Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-10T11:59:28.072Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sctp/protocol.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c29affd44e6769e3073235d4b471d9b501fa8166", "status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "versionType": "git"}, {"lessThan": "c6eb2d615210b80339548ab07c0230edaab9a6c7", "status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "versionType": "git"}, {"lessThan": "8ff78591d309c50a4fdab683b68dd8d512a270dd", "status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "versionType": "git"}, {"lessThan": "3bf0e349cbb4f975f35eb22753acc346b89c66a0", "status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "versionType": "git"}, {"lessThan": "37ff9794be48d0caa37687e04d09675f9c849121", "status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "versionType": "git"}, {"lessThan": "ffb2bd7ade36ec4da32c46a6eddbf4515316d08c", "status": "affected", "version": "046c052b475e7119b6a30e3483e2888fc606a2f8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sctp/protocol.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\nsctp: close UDP tunnel sockets during netns teardown\n\nproc_sctp_do_udp_port() starts per-net SCTP UDP tunneling sockets when\nnet.sctp.udp_port is set, and stops/restarts them when the sysctl value\nchanges. The netns exit path does not stop these sockets, so a namespace\ncan be torn down while its SCTP UDP tunnel sockets are still installed.\n\nClose the UDP tunnel sockets from sctp_ctrlsock_exit() after unregistering\nthe per-net sysctl table. This prevents new sysctl writes from racing in\nwhile the sockets are being released, and closes the sockets before the\ncontrol socket is destroyed."}], "id": "CVE-2026-68161", "lastModified": "2026-10-19T21:17:56.603", "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-2026-68161", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:45:23.310568Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:02.447", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37ff9794be48d0caa37687e04d09675f9c849121"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3bf0e349cbb4f975f35eb22753acc346b89c66a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8ff78591d309c50a4fdab683b68dd8d512a270dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c29affd44e6769e3073235d4b471d9b501fa8166"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6eb2d615210b80339548ab07c0230edaab9a6c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ffb2bd7ade36ec4da32c46a6eddbf4515316d08c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-404"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Linux kernel SCTP: Resource leak due to improper UDP tunnel socket closure during netns teardown", "id": "2513179", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513179"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsctp: close UDP tunnel sockets during netns teardown\nproc_sctp_do_udp_port() starts per-net SCTP UDP tunneling sockets when\nnet.sctp.udp_port is set, and stops/restarts them when the sysctl value\nchanges. The netns exit path does not stop these sockets, so a namespace\ncan be torn down while its SCTP UDP tunnel sockets are still installed.\nClose the UDP tunnel sockets from sctp_ctrlsock_exit() after unregistering\nthe per-net sysctl table. This prevents new sysctl writes from racing in\nwhile the sockets are being released, and closes the sockets before the\ncontrol socket is destroyed.", "A flaw was found in the Linux kernel's SCTP (Stream Control Transmission Protocol) implementation. When a network namespace (netns) is torn down, the associated SCTP UDP (User Datagram Protocol) tunnel sockets are not properly closed. This oversight can lead to a resource leak, potentially resulting in a denial of service (DoS) condition due to resource exhaustion or unexpected behavior during subsequent system calls."], "name": "CVE-2026-68161", "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": "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T11:59:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68161\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68161\nhttps://git.kernel.org/stable/c/37ff9794be48d0caa37687e04d09675f9c849121\nhttps://git.kernel.org/stable/c/3bf0e349cbb4f975f35eb22753acc346b89c66a0\nhttps://git.kernel.org/stable/c/8ff78591d309c50a4fdab683b68dd8d512a270dd\nhttps://git.kernel.org/stable/c/c6eb2d615210b80339548ab07c0230edaab9a6c7\nhttps://git.kernel.org/stable/c/ffb2bd7ade36ec4da32c46a6eddbf4515316d08c"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[046c052b475e7119b6a30e3483e2888fc606a2f8,c6eb2d615210b80339548ab07c0230edaab9a6c7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[046c052b475e7119b6a30e3483e2888fc606a2f8,8ff78591d309c50a4fdab683b68dd8d512a270dd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[046c052b475e7119b6a30e3483e2888fc606a2f8,3bf0e349cbb4f975f35eb22753acc346b89c66a0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[046c052b475e7119b6a30e3483e2888fc606a2f8,37ff9794be48d0caa37687e04d09675f9c849121)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[046c052b475e7119b6a30e3483e2888fc606a2f8,ffb2bd7ade36ec4da32c46a6eddbf4515316d08c)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.151,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T16:30:04.950845+00:00", "updated": "2026-10-20T13:30:06.282099+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}