CVE-2026-90094 PUBLISHED

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

Assigner: Linux
Reserved: 11.09.2026 Published: 17.09.2026 Updated: 17.09.2026

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

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 4d51ff5bba00a13ca9b0b24883fa7adb07a167fc to 00a73ce437e27fdc636a5ede445a4a491e01788d (excl.)
  • affected from 4d51ff5bba00a13ca9b0b24883fa7adb07a167fc to 2f10bc3ff24c91657887901c3235b803e5055f2b (excl.)
  • affected from 4d51ff5bba00a13ca9b0b24883fa7adb07a167fc to b8f070ac3167595069feb1f794c127b805115645 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.17 is affected
  • unaffected from 0 to 6.17 (excl.)
  • unaffected from 6.18.52 to 6.18.* (incl.)
  • unaffected from 7.2.6 to 7.2.* (incl.)
  • unaffected from 7.3-rc1 to * (incl.)

References