SB20260918341 - Insufficient verification of data authenticity in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) Insufficient verification of data authenticity (CVE-ID: CVE-2026-90333)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause modified data to be treated as authentic.

The vulnerability exists due to improper verification of data authenticity in the dm-integrity discard-block check within dm_integrity_rw_tag() when processing blocks marked with the constant discard filler tag. A local privileged user can write a forged discard filler tag to the backing device to cause modified data to be treated as authentic.

The issue requires standalone dm-integrity mode with discard requests enabled.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775
• https://git.kernel.org/stable/c/6228722c27304e4682cddc1fede03898f87e4414
• https://git.kernel.org/stable/c/68c5c42567bc462139128968ebbfadd0aefff519