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CVE-2026-53225

sctp: fix uninit-value in __sctp_rcv_asconf_lookup()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

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").

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux 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 Linux

    2.6.25

  • KernelLinux

    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

References 8

git.kernel.org