arm64: process: Fix context switching MTE store-only tag check (CVE-2026-90094) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90094

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

Answer in brief

CVE-2026-90094 records a Unknown severity vulnerability in arm64: process: Fix context switching MTE store-only tag check. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=4d51ff5bba00a13ca9b0b24883fa7adb07a167fc <00a73ce437e27fdc636a5ede445a4a491e01788d \|\| >=4d51ff5bba00a13ca9b0b24883fa7adb07a167fc <2f10bc3ff24c91657887901c3235b803e5055f2b \|\| >=4d51ff5bba00a13ca9b0b24883fa7adb07a167fc <b8f070ac3167595069feb1f794c127b805115645	00a73ce437e27fdc636a5ede445a4a491e01788d, 2f10bc3ff24c91657887901c3235b803e5055f2b, b8f070ac3167595069feb1f794c127b805115645
Linux/Linuxgeneric	6.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 00a73ce437e27fdc636a5ede445a4a491e01788d if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

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

Quoted source text, attributed separately from HOL analysis.