CVE-2026-43074

Description

In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.

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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

0.0001

Probability of exploitation

0.02%

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/07712db80857d5d09ae08f3df85a708ecfc3b61f https://git.kernel.org/stable/c/5b1173b165421561db29f30afc7e97d940a398a9 https://git.kernel.org/stable/c/7e8083f5eeedab0f460063b9c2c14c9a4e71a427 https://git.kernel.org/stable/c/a6566cd33f6f967a7651ebf2ce0dd31572e319cf https://git.kernel.org/stable/c/ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322

Frequently Asked Questions

What is CVE-2026-43074? +

In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43074? +

CVE-2026-43074 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 0.0001, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-43074? +

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.