---
id: CVE-2026-92517
title: |-
  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
summary: |-
  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…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fb7cefabae8117c203155ef169a386bec43bbba9 <
    26d9496c826586338d1b8c27edfec4a19a89f462
  - >-
    Linux >= fb7cefabae8117c203155ef169a386bec43bbba9 <
    08fe2eaa609180c1baeb76c2629a9c82263b0427
  - >-
    Linux >= fb7cefabae8117c203155ef169a386bec43bbba9 <
    5eb8921371c6fd117d4a328b6053dfda38707df8
  - Linux 6.18
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:54.587'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92517'
references:
  - url: 'https://git.kernel.org/stable/c/08fe2eaa609180c1baeb76c2629a9c82263b0427'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/26d9496c826586338d1b8c27edfec4a19a89f462'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5eb8921371c6fd117d4a328b6053dfda38707df8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.778Z'
epss: 0.00206
epssPercentile: 0.09463
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.