338 lines
17 KiB
JSON
338 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-53225",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-06-09T07:44:35.392Z",
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"datePublished": "2026-06-25T08:39:25.911Z",
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"dateUpdated": "2026-10-19T19:57:29.994Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:34:17.928Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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\")."
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}
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],
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"metrics": [
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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}
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],
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"title": "sctp: fix uninit-value in __sctp_rcv_asconf_lookup()",
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