SB20260925197 - Use-after-free in Linux kernel sunrpc auth_gss
Published: September 25, 2026
Security Bulletin ID
SB20260925197
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-93207)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to access freed memory.
The vulnerability exists due to a use-after-free condition in svcauth_gss_decode_credbody() when processing malformed RPC GSS credential bodies. A remote attacker can send a malformed RPC GSS credential to access freed memory.
The credential storage is reused across requests, allowing a dangling context-data pointer to be paired with a stale length after request pages are released.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0e18641708eaa8bc3c1ff338cd844aeadbd52bac
- https://git.kernel.org/stable/c/0fa8a8acae57e6373962741d5b06d13f44aba6a9
- https://git.kernel.org/stable/c/11539e8fcce0b0af062ae5fecf7b3676c2f7aeed
- https://git.kernel.org/stable/c/56b29d62017c7dd1718d060dd5b3a2ce61095d0c
- https://git.kernel.org/stable/c/e0778464049b0238f2915a40007a4154f86cf351