bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98787
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:32 UTC
Updated2026-10-19 10:19:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch() bpf_mem_cache_free_rcu() uses this_cpu_ptr() which requires migration to be disabled. All callers of rhtab_delete_elem() disable migration except __rhtab_map_lookup_and_delete_batch(), which calls it under rcu_read_lock() only. On CONFIG_PREEMPT_RCU, rcu_read_lock() does not disable preemption or migration, so the task can migrate between CPUs during the delete loop, causing this_cpu_ptr() to trigger: BUG: using smp_processor_id() in preemptible [00000000] code Fix by wrapping the delete loop in migrate_disable()/migrate_enable() in __rhtab_map_lookup_and_delete_batch(), matching the migration protection that the other callers already provide.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 818e0084822742fc00eacbf5df3476a5e72c7d0e 94f41ec5fa578765b74ad5736c2f029e7aabc46d git Not specified
CNA Linux Linux affected 818e0084822742fc00eacbf5df3476a5e72c7d0e de020dc8049bfb2b22e3b6d99c031feb2e22d112 git Not specified
CNA Linux Linux affected 7.2 Not specified
CNA Linux Linux unaffected 7.2 semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/94f41ec5fa578765b74ad5736c2f029e7aabc46d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de020dc8049bfb2b22e3b6d99c031feb2e22d112 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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