Bug 2536595 (CVE-2026-90094) - CVE-2026-90094 kernel: arm64: process: Fix context switching MTE store-only tag check
Summary: CVE-2026-90094 kernel: arm64: process: Fix context switching MTE store-only t...
Keywords:
Status: NEW
Alias: CVE-2026-90094
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 18:38 UTC by OSIDB Bzimport
Modified: 2026-10-13 12:33 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-17 18:38:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

arm64: process: Fix context switching MTE store-only tag check

SCTLR_EL1.TCSO0 is set when user opt-in for MTE store-only tag check
mode. However, it is not part of SCTLR_USER_MASK which imply that on
context switch we never clear SCTLR_EL1.TCSO0, so we are leaking that
setting into another task.

Fix that by including SCTLR_EL1_TCSO0_MASK into SCTLR_USER_MASK
Comment 1 Keith Grant 2026-09-22 20:39:53 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90094.mbox
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