SB2026032582 - Observable discrepancy in Linux kernel smb server
Published: March 25, 2026
Security Bulletin ID
SB2026032582
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Observable discrepancy (CVE-ID: CVE-2026-23364)
The vulnerability allows a local user to obtain sensitive information.
The vulnerability exists due to improper timing handling in the ksmbd component when comparing message authentication codes (MACs). A local user can leverage timing differences during MAC comparison to infer sensitive information.
Exploitation requires local access and the ability to trigger MAC comparisons through the ksmbd subsystem.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3
- https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418c
- https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28
- https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fa
- https://git.kernel.org/stable/c/cd52a0e309659537048a864211abc3ea4c5caa63
- https://git.kernel.org/stable/c/f4588b85efd6007d46b80aa1b9fb746628ffb3dc