What’s Vulnerable › Vulnerabilities

CVE-2025-38202: bpf: Check rcu_read_lock_trace_held() in bpf_map_lookup_percpu_elem()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-04 · updated 2026-06-17

Description

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.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.19 before 6.1.142; from 6.2 before 6.6.95; from 6.7 before 6.12.35; from 6.13 before 6.15.4 — fixed in 6.1.142, 6.12.35, 6.15.4, 6.6.95

How to fix

Upgrade to a fixed version: Linux kernel 6.1.142, 6.12.35, 6.15.4, 6.6.95. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2d834477bbc1e8b8a59ff8b0c081529d6bed7b22
• https://git.kernel.org/stable/c/2f8c69a72e8ad87b36b8052f789da3cc2b2e186c
• https://git.kernel.org/stable/c/7bf4461f1c97207fda757014690d55a447ce859f
• https://git.kernel.org/stable/c/b522d4d334f206284b1a44b0b0b2f99fd443b39b
• https://git.kernel.org/stable/c/d4965578267e2e81f67c86e2608481e77e9c8569
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

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