LoongArch: BPF: Move arena register slot below TCC context

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Summary

CVECVE-2026-89905
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:16:59 UTC
Updated2026-09-16 11:16:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Move arena register slot below TCC context Currently, the stack layout places the optional arena register slot above the tail call counter context. When arena_vm_start is dynamically enabled, it shifts the relative offset of the tcc_ptr slot within the stack frame, causing hardcoded tracking macros to mismatch and leading to memory misalignment or corruption potentially. To fix this, move the arena register save and restore sequences below the tail call counter context slots in both build_prologue() and the epilogue. Update __build_epilogue() to insert a proper offset decrement to safely skip the unneeded tcc_ptr reading block while accurately aligning with the relocated arena slot at the very bottom. With this patch, the tcc_ptr slot is always positioned at a fixed distance directly underneath the base callee-saved registers that is independent of whether the arena features are on.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ef54c517a9376b188da06b5e1ed556129c4280be f0e4d069cb47cf4f8dc4f6bc104e0671155aa3b9 git Not specified
CNA Linux Linux affected ef54c517a9376b188da06b5e1ed556129c4280be cd7e356b07a27e91394838cf3fb655862b519294 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.2.5 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/cd7e356b07a27e91394838cf3fb655862b519294 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0e4d069cb47cf4f8dc4f6bc104e0671155aa3b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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