bpf: Disallow interpreter fallback for BPF_ADDR_PERCPU insn

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Summary

CVECVE-2026-93270
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:24 UTC
Updated2026-09-24 16:17:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Disallow interpreter fallback for BPF_ADDR_PERCPU insn The BPF_MOV64_PERCPU_REG insn requires JIT to emit native code to for 'dst_reg = src_reg + <percpu_base_off>'. However, the interpreter ignores the 'off' at its ALU64_MOV_X label. The 'off' indicates the insn is BPF_MOV64_PERCPU_REG insn. Then, when the interpreter loads memory from the register, it will hit a page fault. [ 2.545572] BUG: unable to handle page fault for address: ffffffffacaaf034 [ 2.546485] #PF: supervisor read access in kernel mode [ 2.547167] #PF: error_code(0x0000) - not-present page [ 2.547850] PGD 134e63067 P4D 134e63067 PUD 134e64063 PMD 10021c063 PTE 800ffffeca550062 [ 2.548912] Oops: Oops: 0000 [#1] SMP PTI Set jit_required as true in order to disallow interpreter fallback in core.c::__bpf_prog_select_runtime(), if any BPF_ADDR_PERCPU insn is patched to the prog. BTW, rename the helper bpf_map_supports_cpu_flags() to bpf_map_is_percpu_map().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7bdbf7446305cb65c510c16d57cde82bc76b234a 57cf929a33cb76be3f24886073ae820b4c496914 git Not specified
CNA Linux Linux affected 7bdbf7446305cb65c510c16d57cde82bc76b234a 7a0855e73757ee9cf25ba635a1c735018ecba742 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 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/57cf929a33cb76be3f24886073ae820b4c496914 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a0855e73757ee9cf25ba635a1c735018ecba742 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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