SB20260812239 - Improper Authentication in Linux kernel sctp
Published: August 12, 2026
Security Bulletin ID
SB20260812239
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Authentication (CVE-ID: CVE-2026-68300)
CWE-ID: CWE-287 - Improper Authentication
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to bypass authentication.
The vulnerability exists due to improper authentication in sctp_auth_chunk_verify() when processing SCTP chunks with a NULL auth_chunk. A remote user can send a specially crafted SCTP chunk to bypass authentication.
This can occur for new connections or when no AUTH chunk precedes a COOKIE-ECHO chunk.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a
- https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646
- https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451
- https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14
- https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb