CVE-2026-53225 (GCVE-0-2026-53225)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI?
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").
Severity ?
9.1 (Critical)
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
df21857714398acb8b24a8bb5a6d2286dd9c59ef , < 446e0ecd845abc394b24ae2030a883572bec9d16
(git)
Affected: df21857714398acb8b24a8bb5a6d2286dd9c59ef , < 928dd94db23e8ba340f83d68f7f24d831b7a4426 (git) Affected: df21857714398acb8b24a8bb5a6d2286dd9c59ef , < d796cfd06074b579d265b28401306cadd30db945 (git) Affected: df21857714398acb8b24a8bb5a6d2286dd9c59ef , < 8ce96f1182644079249a24ac7e2ffc32e0301a46 (git) Affected: df21857714398acb8b24a8bb5a6d2286dd9c59ef , < d6bd0bb7697ea8c0387b0d9d973453f479017b23 (git) Affected: df21857714398acb8b24a8bb5a6d2286dd9c59ef , < f76a8b323e28e0951f979dbef20a7496383c47df (git) Affected: df21857714398acb8b24a8bb5a6d2286dd9c59ef , < 8e86817b8af4d552f3c6fe04ca52bb0c8c57411d (git) Affected: df21857714398acb8b24a8bb5a6d2286dd9c59ef , < f8373d7090b745728de66308deeecc67e8d319ce (git) |
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{
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{
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"cpeApplicability": [
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"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-\u003efrom_addr_param(), which reads the full address (16 bytes for IPv6)\ntrusting the parameter\u0027s 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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"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-28T06:40:37.092Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/446e0ecd845abc394b24ae2030a883572bec9d16"
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"url": "https://git.kernel.org/stable/c/928dd94db23e8ba340f83d68f7f24d831b7a4426"
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{
"url": "https://git.kernel.org/stable/c/8ce96f1182644079249a24ac7e2ffc32e0301a46"
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{
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},
{
"url": "https://git.kernel.org/stable/c/f8373d7090b745728de66308deeecc67e8d319ce"
}
],
"title": "sctp: fix uninit-value in __sctp_rcv_asconf_lookup()",
"x_generator": {
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-53225",
"datePublished": "2026-06-25T08:39:25.911Z",
"dateReserved": "2026-06-09T07:44:35.392Z",
"dateUpdated": "2026-06-28T06:40:37.092Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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