bpf: Do not allow deleting local storage in NMI

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Summary

CVECVE-2026-53106
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:24 UTC
Updated2026-06-24 17:17:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Do not allow deleting local storage in NMI Currently, local storage may deadlock when deferring freeing selem or local storage through kfree_rcu(), call_rcu() or call_rcu_tasks_trace() in NMI or reentrant. Since deleting selem in NMI is an unlikely use case, partially mitigate it by returning error when calling from bpf_xxx_storage_delete() helpers in NMI. Note that, it is still possible to deadlock through reentrant. A full mitigation requires returning error when irqs_disabled() is true, which, however is too heavy-handed for bpf_xxx_storage_delete(). The long-term solution requires _nolock versions of call_rcu. Another possible solution is to defer the free through irq_work [0], but it would grow the size of selem, which is non-ideal. The check is only needed in bpf_selem_unlink(), which is used by helpers and syscalls. bpf_selem_unlink_nofail() is fine as it is called during map and owner tear down that never run in NMI or reentrant. [0] https://lore.kernel.org/bpf/[email protected]/

Risk And Classification

EPSS: 0.001450000 probability, percentile 0.041660000 (date 2026-06-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a10787e6d58c24b51e91c19c6d16c5da89fcaa4b e84acaf936970b5b0be2c93bbf255295ba9406df git Not specified
CNA Linux Linux affected a10787e6d58c24b51e91c19c6d16c5da89fcaa4b 350de5b8a9befaa2a68861c51f671d4f5f751ca5 git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/350de5b8a9befaa2a68861c51f671d4f5f751ca5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e84acaf936970b5b0be2c93bbf255295ba9406df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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