CVE-2024-40909: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.

Affected products

• Linux Linux Kernel: from 6.6.26, before 6.6.35 (fixed in 6.6.35); from 6.9, before 6.9.6 (fixed in 6.9.6); version 6.10 only

Published 2024-07-12. Last modified 2026-08-04.