fprobe: Fix unregister_fprobe() to wait for RCU grace period

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Summary

CVECVE-2026-64075
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:48 UTC
Updated2026-07-19 16:17:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fprobe: Fix unregister_fprobe() to wait for RCU grace period Commit 4346ba1604093 ("fprobe: Rewrite fprobe on function-graph tracer") changed fprobe to register struct fprobe to an rcu-hlist, but it forgot to wait for RCU GP. Thus there can be use-after-free if the fprobe is released right after unregistering. This can be happened on fprobe event and sample module code. To fix this issue, add synchronize_rcu() in unregister_fprobe(). Note that BPF is OK because fprobe is used as a part of bpf_kprobe_multi_link. This unregisters its fprobe in bpf_kprobe_multi_link_release() and it is deallocated via bpf_kprobe_multi_link_dealloc(), which is invoked from bpf_link_defer_dealloc_rcu_gp() RCU callback. For BPF, this also introduced unregister_fprobe_async() which does NOT wait for RCU grace priod.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.061660000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4346ba1604093305a287e08eb465a9c15ba05b80 56b4cfcf1518245493c60fd39c56978f508f1816 git Not specified
CNA Linux Linux affected 4346ba1604093305a287e08eb465a9c15ba05b80 a4f6a9005ed6cfd360ef2520430927f05f92ffb0 git Not specified
CNA Linux Linux affected 4346ba1604093305a287e08eb465a9c15ba05b80 657b594b2084b39a4bc6d8493aa2140cb00cea49 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/56b4cfcf1518245493c60fd39c56978f508f1816 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a4f6a9005ed6cfd360ef2520430927f05f92ffb0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/657b594b2084b39a4bc6d8493aa2140cb00cea49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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