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

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Summary

CVECVE-2026-90306
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:28 UTC
Updated2026-09-17 17:17:28 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 22107402c2669b0163d43cc68901a2c4a59fa43a git Not specified
CNA Linux Linux affected c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 314f1a6762b5d51b37784ed7dc701d4c3d893703 git Not specified
CNA Linux Linux affected c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 da64b150e4b7bee615b33ab21f3137c31ec36922 git Not specified
CNA Linux Linux affected c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3 8ed9bff906cf8036531d1559f10e82733a52b41f git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8ed9bff906cf8036531d1559f10e82733a52b41f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/da64b150e4b7bee615b33ab21f3137c31ec36922 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/22107402c2669b0163d43cc68901a2c4a59fa43a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/314f1a6762b5d51b37784ed7dc701d4c3d893703 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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