CriticalFix available

sctp: fix uninit-value in __sctp_rcv_asconf_lookup()

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: sctp: fix uninit-value in __sctp_rcv_asconf_lookup() __sctp_rcv_asconf_lookup() in net/sctp/input.c only checks that the ASCONF chunk can hold the ADDIP header and a parameter header, then calls af->from_addr_param(), which reads the full address (16 bytes for IPv6) trusting the parameter's declared length. An unauthenticated peer can send a truncated trailing ASCONF chunk that declares an IPv6 address parameter but stops after the 4-byte parameter header; reached from the no-association lookup path, from_addr_param() then reads uninitialized bytes past the parameter. Impact: an unauthenticated SCTP peer makes the receive path read up to 16 bytes of uninitialized memory past a truncated ASCONF address parameter. The sibling __sctp_rcv_init_lookup() bounds parameters with sctp_walk_params(); this path open-codes the fetch and omits the bound. Verify the whole address parameter lies within the chunk before from_addr_param() reads it, the same class of fix as commit 51e5ad549c43 ("net: sctp: fix KMSAN uninit-value in sctp_inq_pop").

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.10.259, 5.15.210, 6.1.176, 6.12.94, 6.18.36, 6.6.143, 7.0.13
CVEs: CVE-2026-53225
Confirmed fixed CVEs: Not specified
Updated in this feed: 3 Nov 2026, 06:24 UTC · Revision 1

Source evidence

sctp: fix uninit-value in __sctp_rcv_asconf_lookup()

core-osv · Original source

Published 25 Jun 2026, 08:39 UTC

osv:CVE-2026-53225

Kernel

Fixed versions: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13

Complete source record

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  "id": "c840ba648751b54b244075e55066eab0d644350d2e4c101e5dd12876d767728a",
  "url": "https://osv.dev/vulnerability/CVE-2026-53225",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "sctp: fix uninit-value in __sctp_rcv_asconf_lookup()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: sctp: fix uninit-value in __sctp_rcv_asconf_lookup() __sctp_rcv_asconf_lookup() in net/sctp/input.c only checks that the ASCONF chunk can hold the ADDIP header and a parameter header, then calls af->from_addr_param(), which reads the full address (16 bytes for IPv6) trusting the parameter's declared length. An unauthenticated peer can send a truncated trailing ASCONF chunk that declares an IPv6 address parameter but stops after the 4-byte parameter header; reached from the no-association lookup path, from_addr_param() then reads uninitialized bytes past the parameter. Impact: an unauthenticated SCTP peer makes the receive path read up to 16 bytes of uninitialized memory past a truncated ASCONF address parameter. The sibling __sctp_rcv_init_lookup() bounds parameters with sctp_walk_params(); this path open-codes the fetch and omits the bound. Verify the whole address parameter lies within the chunk before from_addr_param() reads it, the same class of fix as commit 51e5ad549c43 (\"net: sctp: fix KMSAN uninit-value in sctp_inq_pop\").",
    "evidence": "osv:CVE-2026-53225",
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      "modified": "2026-10-28T02:30:26.279758895Z",
      "provider": "osv",
      "references": [
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        "https://git.kernel.org/stable/c/446e0ecd845abc394b24ae2030a883572bec9d16",
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        "https://nvd.nist.gov/vuln/detail/CVE-2026-53225",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
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  "source_id": "core-osv",
  "document_id": 493028,
  "published_at": "2026-06-25T08:39:25.911+00:00"
}