bpf, riscv: Fix extable handling for arena load_acquire (CVE-2026-92517) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-92517

bpf, riscv: Fix extable handling for arena load_acquire

Answer in brief

CVE-2026-92517 records a Unknown severity vulnerability in bpf, riscv: Fix extable handling for arena load_acquire. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=fb7cefabae8117c203155ef169a386bec43bbba9 <26d9496c826586338d1b8c27edfec4a19a89f462 \|\| >=fb7cefabae8117c203155ef169a386bec43bbba9 <08fe2eaa609180c1baeb76c2629a9c82263b0427 \|\| >=fb7cefabae8117c203155ef169a386bec43bbba9 <5eb8921371c6fd117d4a328b6053dfda38707df8	26d9496c826586338d1b8c27edfec4a19a89f462, 08fe2eaa609180c1baeb76c2629a9c82263b0427, 5eb8921371c6fd117d4a328b6053dfda38707df8
Linux/Linuxgeneric	6.18	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 26d9496c826586338d1b8c27edfec4a19a89f462 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.