What’s Vulnerable › Vulnerabilities

CVE-2026-90143: net: kcm: Hold RCU read lock while running BPF parser

• Severity: high (CVSS 7.8 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: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: net: kcm: Hold RCU read lock while running BPF parser kcm_parse_func_strparser() calls bpf_prog_run_pin_on_cpu() which prevents CPU migration, but does not establish an RCU read-side critical section. Consequently, BPF map operations can trigger WARN_ON_ONCE(!bpf_rcu_lock_held()) when called from the KCM strparser program. Hold the RCU read lock while running the program.

Affected products

• Linux kernel: 4.9 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1d26a6e007d46babc7fa76e5a157dccf86cd55c0
• https://git.kernel.org/stable/c/21526f8a191a3c50622b8c10bd927870d780eae4
• https://git.kernel.org/stable/c/292846223eaddba890e40699d2ab82ee5671798c
• https://git.kernel.org/stable/c/37108861cf7bd909d4a372069bcd61c8f489e232
• https://git.kernel.org/stable/c/3c70d27e792a28bca650ddd8a9aa0fe3591ffec5
• https://git.kernel.org/stable/c/b0346dd64e4905291cc9c479f2e6cf1884ced4e6
• https://git.kernel.org/stable/c/b0e94ea63dbdcbfec9beb819cd5f8fa584809ef2
• https://git.kernel.org/stable/c/f392affef3c9ce64dfdde794df0579e0a7793440

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