Linux Kernel up to 7.2.5 BPF bpf_jit_inlines_helper_call jit_required memory corruption

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been classified as problematic. Affected is the function bpf_jit_inlines_helper_call of the component BPF. The manipulation of the argument jit_required leads to memory corruption. This vulnerability is listed as CVE-2026-93135. The attack must be carried out locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 7.2.5. This issue affects the function bpf_jit_inlines_helper_call of the component BPF. The manipulation of the argument jit_required with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is availability. The summary by CVE is:

In 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.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-93135 since 09/17/2026. The exploitation is known to be easy. An attack has to be approached locally. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but no exploit is available.

Upgrading to version 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 21c6445366795fa3a89954e1d318e7c8afdef843/f1c27922576edccb99d0257827d09bd05c0304a6 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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