Insufficient verification of data authenticity in Linux kernel - CVE-2026-90333
Published: September 18, 2026
Vulnerability identifier: #VU151154
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-90333
CWE-ID: CWE-345
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-90333
Install security update from vendor's repository.