Bug 2376382 (CVE-2025-38202)

Summary: CVE-2025-38202 kernel: bpf: Check rcu_read_lock_trace_held() in bpf_map_lookup_percpu_elem()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-07-04 14:02:47 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Check rcu_read_lock_trace_held() in bpf_map_lookup_percpu_elem()

bpf_map_lookup_percpu_elem() helper is also available for sleepable bpf
program. When BPF JIT is disabled or under 32-bit host,
bpf_map_lookup_percpu_elem() will not be inlined. Using it in a
sleepable bpf program will trigger the warning in
bpf_map_lookup_percpu_elem(), because the bpf program only holds
rcu_read_lock_trace lock. Therefore, add the missed check.
Comment 1 Mauro Matteo Cascella 2025-07-04 18:52:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025070418-CVE-2025-38202-bef0@gregkh/T