{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53225", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.392Z", "datePublished": "2026-06-25T08:39:25.911Z", "dateUpdated": "2026-08-05T12:34:17.928Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:17.928Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix uninit-value in __sctp_rcv_asconf_lookup()\n\n__sctp_rcv_asconf_lookup() in net/sctp/input.c only checks that the ASCONF\nchunk can hold the ADDIP header and a parameter header, then calls\naf->from_addr_param(), which reads the full address (16 bytes for IPv6)\ntrusting the parameter's declared length.\n\nAn unauthenticated peer can send a truncated trailing ASCONF chunk that\ndeclares an IPv6 address parameter but stops after the 4-byte parameter\nheader; reached from the no-association lookup path, from_addr_param() then\nreads uninitialized bytes past the parameter.\n\nImpact: an unauthenticated SCTP peer makes the receive path read up to 16\nbytes of uninitialized memory past a truncated ASCONF address parameter.\n\nThe sibling __sctp_rcv_init_lookup() bounds parameters with\nsctp_walk_params(); this path open-codes the fetch and omits the bound.\nVerify the whole address parameter lies within the chunk before\nfrom_addr_param() reads it, the same class of fix as commit 51e5ad549c43\n(\"net: sctp: fix KMSAN uninit-value in sctp_inq_pop\")." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is reached from the SCTP packet receive path via IP/IPv6 or SCTP-over-UDP encapsulation. A remote peer can send the malformed AUTH-bundled ASCONF packet over the network.\nAC:L - Triggering only requires a syntactically valid SCTP packet with an AUTH chunk before a truncated ASCONF chunk declaring an IPv6 address parameter. There is no race or condition outside attacker control.\nPR:N - The association lookup path only checks that an AUTH chunk was seen before ASCONF; it does not validate the AUTH HMAC before the vulnerable read. The commit explicitly describes an unauthenticated peer reaching the bug.\nUI:N - No victim action is required after SCTP is reachable on the target. The attacker sends network packets directly to the kernel receive path.\nS:U - The vulnerability affects the kernel SCTP networking stack within the same operating-system security authority. It does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The bug causes an unauthenticated out-of-bounds/uninitialized read of up to a full IPv6 address worth of bytes past a truncated ASCONF parameter. Under the provided guidance, this is scored High because it is an OOB read not strictly limited to a few harmless bytes.\nI:N - The vulnerable operation reads bytes into a temporary SCTP address used for lookup and does not write attacker data to kernel structures. No direct integrity modification or control-flow overwrite is present.\nA:H - The malformed packet can repeatedly trigger an invalid kernel receive-path read, and such out-of-bounds reads can fault or panic on hardened/sanitized deployments. With uncertainty resolved upward, availability impact is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sctp/input.c" ], "versions": [ { "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef", "lessThan": "446e0ecd845abc394b24ae2030a883572bec9d16", "status": "affected", "versionType": "git" }, { "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef", "lessThan": "928dd94db23e8ba340f83d68f7f24d831b7a4426", "status": "affected", "versionType": "git" }, { "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef", "lessThan": "d796cfd06074b579d265b28401306cadd30db945", "status": "affected", "versionType": "git" }, { "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef", "lessThan": "8ce96f1182644079249a24ac7e2ffc32e0301a46", "status": "affected", "versionType": "git" }, { "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef", "lessThan": "d6bd0bb7697ea8c0387b0d9d973453f479017b23", "status": "affected", "versionType": "git" }, { "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef", "lessThan": "f76a8b323e28e0951f979dbef20a7496383c47df", "status": "affected", "versionType": "git" }, { "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef", "lessThan": "8e86817b8af4d552f3c6fe04ca52bb0c8c57411d", "status": "affected", "versionType": "git" }, { "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef", "lessThan": "f8373d7090b745728de66308deeecc67e8d319ce", "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/input.c" ], "versions": [ { "version": "2.6.25", "status": "affected" }, { "version": "0", "lessThan": "2.6.25", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "2.6.25", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.12.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/446e0ecd845abc394b24ae2030a883572bec9d16" }, { "url": "https://git.kernel.org/stable/c/928dd94db23e8ba340f83d68f7f24d831b7a4426" }, { "url": "https://git.kernel.org/stable/c/d796cfd06074b579d265b28401306cadd30db945" }, { "url": "https://git.kernel.org/stable/c/8ce96f1182644079249a24ac7e2ffc32e0301a46" }, { "url": "https://git.kernel.org/stable/c/d6bd0bb7697ea8c0387b0d9d973453f479017b23" }, { "url": "https://git.kernel.org/stable/c/f76a8b323e28e0951f979dbef20a7496383c47df" }, { "url": "https://git.kernel.org/stable/c/8e86817b8af4d552f3c6fe04ca52bb0c8c57411d" }, { "url": "https://git.kernel.org/stable/c/f8373d7090b745728de66308deeecc67e8d319ce" } ], "title": "sctp: fix uninit-value in __sctp_rcv_asconf_lookup()", "x_generator": { "engine": "bippy-1.2.0" } } } }