CVE-2026-90306 PUBLISHED

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

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

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 to 22107402c2669b0163d43cc68901a2c4a59fa43a (excl.)
  • affected from c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 to 314f1a6762b5d51b37784ed7dc701d4c3d893703 (excl.)
  • affected from c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 to da64b150e4b7bee615b33ab21f3137c31ec36922 (excl.)
  • affected from c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 to 8ed9bff906cf8036531d1559f10e82733a52b41f (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.10 is affected
  • unaffected from 0 to 6.10 (excl.)
  • unaffected from 6.12.110 to 6.12.* (incl.)
  • 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