Insufficient verification of data authenticity in Linux kernel - CVE-2026-90333

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

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.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.115-2

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

• Insufficient verification of data authenticity in Linux kernel md driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more