CVE-2024-40909
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.28% probability · 20th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63aPatch
- https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209Patch
- https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382Patch
- https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63aPatch
- https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209Patch
- https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.