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CVE-2026-68320

sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the capacity limit for ep->auth_chunk_list, allowing it to hold up to 20 chunk entries (param_hdr.length up to 24). However, the copy destination asoc->c.auth_chunks in struct sctp_cookie is only SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16 chunks are added, sctp_association_init() memcpy overflows the destination by up to 4 bytes. Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching the destination capacity.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 3d22a7da2e264f407c729f33a0a346ff76108bc6; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 6837c1c19a259518974cbc5a52017646e3906564; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 54bb4c03fa17cdcb157c26c33e60a78cf32960f5; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 5a365f1e423444c5da7eb689a8661633dad43e48; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 886e28e14ab655012779016d251fef53d103aa12; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 11092d79eb2b7c0068382f72fc2416d1786bb2e0; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in b6ea3dda09eb4d5caf7bbc00f857688cf9e98255; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in ff04b26794a16a8a879eb4fd2c02c2d6b03850e9

  • Linux Linux

    2.6.24

  • KernelLinux

    From 2.6.24 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 8

git.kernel.org