CVE-2026-90143 (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.07%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other 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

Frequently Asked Questions

What is CVE-2026-90143? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-90143? +

CVE-2026-90143 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-90143? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-90143