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CVE-2026-68376

sctp: fix auth_hmacs array size in struct sctp_cookie

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: total

Summary

In the Linux kernel, the following vulnerability has been resolved: sctp: fix auth_hmacs array size in struct sctp_cookie The auth_hmacs array in struct sctp_cookie is supposed to store a complete SCTP_AUTH_HMAC_ALGO parameter, which consists of a struct sctp_paramhdr followed by N HMAC identifiers. However, the array size was calculated using an extra 2 bytes instead of sizeof(struct sctp_paramhdr), which is 4 bytes. When four HMAC identifiers are configured, the HMAC-ALGO parameter stored in the endpoint is larger than the auth_hmacs buffer in the cookie. As a result, sctp_association_init() copies beyond the end of auth_hmacs when initializing the association, corrupting the adjacent auth_chunks field. This can lead to an invalid HMAC identifier being accepted and later cause an out-of-bounds read in sctp_auth_get_hmac(). Fix the array size calculation by including the full SCTP parameter header size.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 317731d01b03c529809df36d3a7d149677a8729d; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 0528485f27016a42804abe01aa61b39d85fa803e; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in ee5e65964f456adfe14d526fba0bd055de98ecf3; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 0b4414e43e0861d67276031cc21401d7e87de3da; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in d0a59ba58578e2b330fff80a44fe519f3ba7d8c7; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in 3aa40c3bccac2312ea7cf97f329190637f972b5d; From 1f485649f52929d9937b346a920a522a7363e202 · fixed in e0b5252a59383b77d1b8dbeda00b7184dd95f4d3

  • 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