SB2026091954 - Memory leak in Linux kernel smb server

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2026-90163)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause a denial of service through resource exhaustion.

The vulnerability exists due to improper resource cleanup in the KSMBD server module initialization error-unwind path when a later module initializer fails. A local privileged user can trigger KSMBD server module initialization that encounters a later initializer failure to cause a denial of service through resource exhaustion.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7d2cd9269b570347e6e2dd24d4b3c1da868bc91d
• https://git.kernel.org/stable/c/f43cbe3b58ce989ce420c3bc875d48e7754c8aba