CVE-2024-40909
High
Description
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedJul 12, 2024
First seenJul 12, 2024
How to fix
Update
- linux linux_kernel6.6.35, 6.9.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.6.26 ≤ v < 6.6.35, 6.9 ≤ v < 6.9.6, 6.10 | 6.6.35, 6.9.6 |
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