CVE-2026-90094

Summary

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4d51ff5bba00a13ca9b0b24883fa7adb07a167fc < 00a73ce437e27fdc636a5ede445a4a491e01788daffected
LinuxLinux4d51ff5bba00a13ca9b0b24883fa7adb07a167fc < 2f10bc3ff24c91657887901c3235b803e5055f2baffected
LinuxLinux4d51ff5bba00a13ca9b0b24883fa7adb07a167fc < b8f070ac3167595069feb1f794c127b805115645affected
LinuxLinux6.17affected
LinuxLinux0 < 6.17unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References