CVE-2026-99165

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99165", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.398Z", "datePublished": "2026-10-28T10:35:17.366Z", "dateUpdated": "2026-10-30T12:42:30.300Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:42:30.300Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: revalidate output stream after association connect wait\n\nWhen message interleaving is enabled, the first send waits for association\nestablishment before building its data chunks. The wait drops the socket\nlock, and handshake processing can reduce the output stream count to the\npeer-advertised inbound stream count. sctp_stream_init() then frees the\nextension of every removed stream.\n\nThe sender resumes with the stream that it checked before the wait. If the\npeer removed that stream, sctp_outq_tail() later dereferences its NULL\nextension. Fatal-oops policies then panic the host.\n\nKASAN: null-ptr-deref in range [0x38-0x3f]\nRIP: sctp_outq_tail+0x49e/0xaa0\nCall Trace:\n sctp_primitive_SEND\n sctp_sendmsg_to_asoc\n sctp_sendmsg\n\nA range check alone is insufficient. Stream reconfiguration can grow the\noutput count again while the lock is released without recreating extensions\nfreed by the earlier shrink. The stream can then be in range while its\nextension remains NULL. The send-buffer wait has the same issue.\n\nFactor the range and extension checks into a helper and repeat both after\neach send-path wait that drops the socket lock. Once the lock is\nreacquired, the validation remains stable through data creation and\nqueueing.\n\nIf validation fails after the connect wait, the auto-created association is\nalready established. Return ESRCH so the existing caller path keeps it\nunder state-machine ownership instead of freeing it directly, which would\nleave protocol, counter and socket state inconsistent."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/socket.c"], "versions": [{"version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "lessThan": "26af2969b29cc5eb893a454fee2a36b39521a5bd", "status": "affected", "versionType": "git"}, {"version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "lessThan": "b925652ba3a3ee11b2617e68de92379144b5b84b", "status": "affected", "versionType": "git"}, {"version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "lessThan": "504bdf55438ad4b1ecbfba0f7fe95e1933f7fb66", "status": "affected", "versionType": "git"}, {"version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "lessThan": "994694a2d4611d7b76cf05ff401a92b1c0451e1f", "status": "affected", "versionType": "git"}, {"version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "lessThan": "84f741b7bb3974e674c9739055826aa040362bba", "status": "affected", "versionType": "git"}, {"version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "lessThan": "77a63d1b813b08c4e5a948f5e04fbaca6176aa8f", "status": "affected", "versionType": "git"}, {"version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "lessThan": "fd56ac95ec31a05b66e8938debfa847f49c0e993", "status": "affected", "versionType": "git"}, {"version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "lessThan": "b7ad72414c673ce1fa1f463e807cd4f34f8be9bf", "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/sctp/socket.c"], "versions": [{"version": "4.16", "status": "affected"}, {"version": "0", "lessThan": "4.16", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.13", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "4.16", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.18.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.2.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/26af2969b29cc5eb893a454fee2a36b39521a5bd"}, {"url": "https://git.kernel.org/stable/c/b925652ba3a3ee11b2617e68de92379144b5b84b"}, {"url": "https://git.kernel.org/stable/c/504bdf55438ad4b1ecbfba0f7fe95e1933f7fb66"}, {"url": "https://git.kernel.org/stable/c/994694a2d4611d7b76cf05ff401a92b1c0451e1f"}, {"url": "https://git.kernel.org/stable/c/84f741b7bb3974e674c9739055826aa040362bba"}, {"url": "https://git.kernel.org/stable/c/77a63d1b813b08c4e5a948f5e04fbaca6176aa8f"}, {"url": "https://git.kernel.org/stable/c/fd56ac95ec31a05b66e8938debfa847f49c0e993"}, {"url": "https://git.kernel.org/stable/c/b7ad72414c673ce1fa1f463e807cd4f34f8be9bf"}], "title": "sctp: revalidate output stream after association connect wait", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sctp/socket.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "26af2969b29cc5eb893a454fee2a36b39521a5bd", "status": "affected", "version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "versionType": "git"}, {"lessThan": "b925652ba3a3ee11b2617e68de92379144b5b84b", "status": "affected", "version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "versionType": "git"}, {"lessThan": "504bdf55438ad4b1ecbfba0f7fe95e1933f7fb66", "status": "affected", "version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "versionType": "git"}, {"lessThan": "994694a2d4611d7b76cf05ff401a92b1c0451e1f", "status": "affected", "version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "versionType": "git"}, {"lessThan": "84f741b7bb3974e674c9739055826aa040362bba", "status": "affected", "version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "versionType": "git"}, {"lessThan": "77a63d1b813b08c4e5a948f5e04fbaca6176aa8f", "status": "affected", "version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "versionType": "git"}, {"lessThan": "fd56ac95ec31a05b66e8938debfa847f49c0e993", "status": "affected", "version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "versionType": "git"}, {"lessThan": "b7ad72414c673ce1fa1f463e807cd4f34f8be9bf", "status": "affected", "version": "668c9beb9020d5834ee9e43c208190a07d2b1928", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sctp/socket.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.16"}, {"lessThan": "4.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.161", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.115", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.59", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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: revalidate output stream after association connect wait\n\nWhen message interleaving is enabled, the first send waits for association\nestablishment before building its data chunks. The wait drops the socket\nlock, and handshake processing can reduce the output stream count to the\npeer-advertised inbound stream count. sctp_stream_init() then frees the\nextension of every removed stream.\n\nThe sender resumes with the stream that it checked before the wait. If the\npeer removed that stream, sctp_outq_tail() later dereferences its NULL\nextension. Fatal-oops policies then panic the host.\n\nKASAN: null-ptr-deref in range [0x38-0x3f]\nRIP: sctp_outq_tail+0x49e/0xaa0\nCall Trace:\n sctp_primitive_SEND\n sctp_sendmsg_to_asoc\n sctp_sendmsg\n\nA range check alone is insufficient. Stream reconfiguration can grow the\noutput count again while the lock is released without recreating extensions\nfreed by the earlier shrink. The stream can then be in range while its\nextension remains NULL. The send-buffer wait has the same issue.\n\nFactor the range and extension checks into a helper and repeat both after\neach send-path wait that drops the socket lock. Once the lock is\nreacquired, the validation remains stable through data creation and\nqueueing.\n\nIf validation fails after the connect wait, the auto-created association is\nalready established. Return ESRCH so the existing caller path keeps it\nunder state-machine ownership instead of freeing it directly, which would\nleave protocol, counter and socket state inconsistent."}], "id": "CVE-2026-99165", "lastModified": "2026-10-30T13:21:50.193", "metrics": {}, "published": "2026-10-28T11:17:36.917", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/26af2969b29cc5eb893a454fee2a36b39521a5bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/504bdf55438ad4b1ecbfba0f7fe95e1933f7fb66"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/77a63d1b813b08c4e5a948f5e04fbaca6176aa8f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/84f741b7bb3974e674c9739055826aa040362bba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/994694a2d4611d7b76cf05ff401a92b1c0451e1f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b7ad72414c673ce1fa1f463e807cd4f34f8be9bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b925652ba3a3ee11b2617e68de92379144b5b84b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fd56ac95ec31a05b66e8938debfa847f49c0e993"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of service via NULL pointer dereference in SCTP stream handling", "id": "2562769", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562769"}, "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-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsctp: revalidate output stream after association connect wait\nWhen message interleaving is enabled, the first send waits for association\nestablishment before building its data chunks. The wait drops the socket\nlock, and handshake processing can reduce the output stream count to the\npeer-advertised inbound stream count. sctp_stream_init() then frees the\nextension of every removed stream.\nThe sender resumes with the stream that it checked before the wait. If the\npeer removed that stream, sctp_outq_tail() later dereferences its NULL\nextension. Fatal-oops policies then panic the host.\nKASAN: null-ptr-deref in range [0x38-0x3f]\nRIP: sctp_outq_tail+0x49e/0xaa0\nCall Trace:\nsctp_primitive_SEND\nsctp_sendmsg_to_asoc\nsctp_sendmsg\nA range check alone is insufficient. Stream reconfiguration can grow the\noutput count again while the lock is released without recreating extensions\nfreed by the earlier shrink. The stream can then be in range while its\nextension remains NULL. The send-buffer wait has the same issue.\nFactor the range and extension checks into a helper and repeat both after\neach send-path wait that drops the socket lock. Once the lock is\nreacquired, the validation remains stable through data creation and\nqueueing.\nIf validation fails after the connect wait, the auto-created association is\nalready established. Return ESRCH so the existing caller path keeps it\nunder state-machine ownership instead of freeing it directly, which would\nleave protocol, counter and socket state inconsistent.", "A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. This flaw allows a remote peer or local user to cause a denial of service (DoS) through a kernel crash. When message interleaving is enabled, the kernel drops the socket lock while waiting for association establishment or send-buffer availability, allowing handshake processing to free output stream extensions without proper revalidation. When the sending process resumes and accesses the unvalidated stream, it dereferences a null pointer, causing a system panic."], "name": "CVE-2026-99165", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-28T10:35:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99165\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99165\nhttps://git.kernel.org/stable/c/77a63d1b813b08c4e5a948f5e04fbaca6176aa8f\nhttps://git.kernel.org/stable/c/b7ad72414c673ce1fa1f463e807cd4f34f8be9bf\nhttps://git.kernel.org/stable/c/fd56ac95ec31a05b66e8938debfa847f49c0e993"], "statement": "This vulnerability is evaluated as having Moderate impact because successful exploitation results in a kernel panic and host denial of service, without granting arbitrary code execution or unauthorized data exposure. Typical Red Hat Enterprise Linux configurations do not automatically load the SCTP kernel module unless an administrator explicitly loads it or an active service binds an SCTP socket. Additionally, triggering the flaw requires local unprivileged socket operations and the specific configuration of SCTP message interleaving combined with stream reconfiguration.", "threat_severity": "Moderate"}

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