CVE-2026-92517
UnknownSummary
In the Linux kernel on RISC-V, exception handling for BPF load_acquire operations is missing an extable entry, causing a kernel oops on a faulty memory access. Additionally, the rd register is not cleared on fault, allowing data leakage through a map. The fix checks ret >= 0 before adding the handler and passes rd for LOAD_ACQ to zero it on fault.
Risk Assessment
Risk of kernel panic due to unhandled exception and potential leakage of sensitive data through a BPF map.
Recommendation
Apply a kernel patch for RISC-V that fixes extable handling for load_acquire in BPF.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf, riscv: Fix extable handling for arena load_acquire emit_atomic_ld_st() returns 1 to have build_body() skip the zext after a sub-word load_acquire. The caller does "ret = ret ?: add_exception_handler(...)", which skips add_exception_handler() on any non-zero ret, so the extable entry is missing and a faulting PROBE_ATOMIC load_acquire oopses. REG_DONT_CLEAR_MARKER leaves rd stale on fault, and the verifier still thinks the load overwrote it, so a program can leak it through a map. Check ret >= 0 before calling add_exception_handler(), and pass rd for LOAD_ACQ so the fault zeroes rd like a PROBE_MEM load. Return ret unchanged for the zext skip.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS