Summary
USN-8496-1 fixed vulnerabilities in cifs-utils. The update caused a
regression and was backed out in USN-8496-2. This update reintroduces the
security fix, along with a fix for the regression.
Original advisory details:
It was discovered that cifs-utils incorrectly dropped root privileges
before looking up user information. A local attacker could possibly use
this issue to execute arbitrary code as the root user.
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | cifs-utils | 2:6.14-1ubuntu0.6 |
| Ubuntu · 24.04 LTS 24.04:LTS | cifs-utils | 2:7.0-2ubuntu0.5 |
| Ubuntu · 26.04 LTS 26.04:LTS | cifs-utils | 2:7.4-1ubuntu0.26.04.3 |
Vulnerabilities 1
-
High 7.8
Cifs-utils: local privilege escalation via forged cifs.spnego key description in cifs.upcall
A flaw was found in the cifs-utils package where the cifs.upcall helper fails to securely drop its root privileges before looking up user information inside a user-controlled environment. A local, low privileged attacker can exploit this by using a crafted re…
References
-
report
https://ubuntu.com/security/CVE-2026-12505