{"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"}}}}