bpf: Reject programs with inlined helpers if JIT is not available

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Summary

CVECVE-2026-93135
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:08 UTC
Updated2026-09-17 17:18:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Reject programs with inlined helpers if JIT is not available When an architecture (such as LoongArch, ARM64, and RISC-V) implements bpf_jit_inlines_helper_call(), the verifier skips rewriting the helper call offset (insn->imm) in bpf_do_misc_fixups(). This is because the helper is expected to be inlined by the JIT compiler later. Therefore, insn->imm remains as the raw helper enum ID. However, if JIT is disabled at runtime (net.core.bpf_jit_enable=0) or if JIT compilation fails dynamically (e.g., due to OOM), the program falls back to the BPF interpreter. When the interpreter executes (__bpf_call_base + insn->imm) with the unpatched raw ID, it jumps into an invalid address space, triggering an instruction alignment fault or a kernel panic. Although these helpers have valid C implementations in the kernel, the omission of offset rewriting makes runtime interpreter fallback fatal. Fix this by setting 'prog->jit_required = 1' when helper call rewriting is skipped for JIT inlining. This ensures that such programs are safely rejected if JIT is not available, preventing the runtime kernel panic.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2ddec2c80b4402c293c7e6e0881cecaaf77e8cec 21c6445366795fa3a89954e1d318e7c8afdef843 git Not specified
CNA Linux Linux affected 2ddec2c80b4402c293c7e6e0881cecaaf77e8cec f1c27922576edccb99d0257827d09bd05c0304a6 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/21c6445366795fa3a89954e1d318e7c8afdef843 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f1c27922576edccb99d0257827d09bd05c0304a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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