bpf, riscv: Fix extable handling for arena load_acquire

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92517
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:54 UTC
Updated2026-09-17 17:17:54 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fb7cefabae8117c203155ef169a386bec43bbba9 26d9496c826586338d1b8c27edfec4a19a89f462 git Not specified
CNA Linux Linux affected fb7cefabae8117c203155ef169a386bec43bbba9 08fe2eaa609180c1baeb76c2629a9c82263b0427 git Not specified
CNA Linux Linux affected fb7cefabae8117c203155ef169a386bec43bbba9 5eb8921371c6fd117d4a328b6053dfda38707df8 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* 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/08fe2eaa609180c1baeb76c2629a9c82263b0427 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/26d9496c826586338d1b8c27edfec4a19a89f462 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5eb8921371c6fd117d4a328b6053dfda38707df8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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