SB20260919114 - Improper initialization in Linux kernel include asm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper initialization (CVE-ID: CVE-2026-90094)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause MTE store-only tag check state to leak into another task.

The vulnerability exists due to improper restoration of SCTLR_EL1.TCSO0 state in arm64 context switching when switching from a task that has opted into MTE store-only tag check mode. A local user can opt into MTE store-only tag check mode and trigger a context switch to cause MTE store-only tag check state to leak into another task.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/00a73ce437e27fdc636a5ede445a4a491e01788d
• https://git.kernel.org/stable/c/2f10bc3ff24c91657887901c3235b803e5055f2b
• https://git.kernel.org/stable/c/b8f070ac3167595069feb1f794c127b805115645