CVE-2026-53225
In the Linux kernel, the following vulnerability has been resolved:
sctp: fix uninit-value in _sctprcvasconflookup()
_sctprcvasconflookup() in net/sctp/input.c only checks that the ASCONF
chunk can hold the ADDIP header and a parameter header, then calls
af->fromaddrparam(), 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, fromaddrparam() 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 _sctprcvinitlookup() bounds parameters with
sctpwalkparams(); this path open-codes the fetch and omits the bound.
Verify the whole address parameter lies within the chunk before
fromaddrparam() reads it, the same class of fix as commit 51e5ad549c43
("net: sctp: fix KMSAN uninit-value in sctpinqpop").
Package Versions Affected
Automatically patch vulnerabilities without upgrading
CVSS Version
Related Resources
References
https://git.kernel.org/stable/c/446e0ecd845abc394b24ae2030a883572bec9d16, https://git.kernel.org/stable/c/8ce96f1182644079249a24ac7e2ffc32e0301a46, https://git.kernel.org/stable/c/8e86817b8af4d552f3c6fe04ca52bb0c8c57411d, https://git.kernel.org/stable/c/928dd94db23e8ba340f83d68f7f24d831b7a4426, https://git.kernel.org/stable/c/d6bd0bb7697ea8c0387b0d9d973453f479017b23, https://git.kernel.org/stable/c/d796cfd06074b579d265b28401306cadd30db945, https://git.kernel.org/stable/c/f76a8b323e28e0951f979dbef20a7496383c47df, https://git.kernel.org/stable/c/f8373d7090b745728de66308deeecc67e8d319ce, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53225.json, https://nvd.nist.gov/vuln/detail/CVE-2026-53225, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git