CVE-2026-23364

ksmbd: Compare MACs in constant time

CVE-2026-23364 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-23364, released March 25, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.4

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0042

36th percentile

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Compare MACs in constant time To prevent timing attacks, MAC comparisons need to be constant-time. Replace the memcmp() with the correct function, crypto_memneq().

Where it's fixed

Product	Fixed in	Fix	Released
Linux
linux · Debian 12.15 (bookworm)	6.1.170-1	DEBIAN-CVE-2026-23364	Mar 25, 2026
linux · Debian 13.5 (trixie)	6.12.85-1	DEBIAN-CVE-2026-23364	Mar 25, 2026
linux · Debian 14	6.19.8-1	DEBIAN-CVE-2026-23364	Mar 25, 2026

Details

Published
March 25, 2026
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23364

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