CVE-2026-90306

Summary

In the Linux kernel, the following vulnerability has been resolved:

ARM: 9481/2: breakpoint: CFI breakpoints only on demand

This removes the stub hw_breakpoint_cfi_handler() from ARM, making it not steal breakpoint type 0x03 (ARM_ENTRY_CFI_BREAKPOINT) unless CFI is actively used in the kernel.

When not instrumenting with CFI, or when a breakpoint is issued in userspace, we fall through to return 1 from hw_breakpoint_pending() "unhandled fault" so userspace can make use of this breakpoint.

Tested with LKDTM and this command line: echo CFI_FORWARD_PROTO > /sys/kernel/debug/provoke-crash/DIRECT still works as expected.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 < 22107402c2669b0163d43cc68901a2c4a59fa43aaffected
LinuxLinuxc3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 < 314f1a6762b5d51b37784ed7dc701d4c3d893703affected
LinuxLinuxc3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 < da64b150e4b7bee615b33ab21f3137c31ec36922affected
LinuxLinuxc3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 < 8ed9bff906cf8036531d1559f10e82733a52b41faffected
LinuxLinux6.10affected
LinuxLinux0 < 6.10unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References