CVE-2025-21904

caif_virtio: fix wrong pointer check in cfv_probe()

Description

In the Linux kernel, the following vulnerability has been resolved: caif_virtio: fix wrong pointer check in cfv_probe() del_vqs() frees virtqueues, therefore cfv->vq_tx pointer should be checked for NULL before calling it, not cfv->vdev. Also the current implementation is redundant because the pointer cfv->vdev is dereferenced before it is checked for NULL. Fix this by checking cfv->vq_tx for NULL instead of cfv->vdev before calling del_vqs().

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/990fff6980d0c1693d60a812f58dbf93eab0473f patch
https://git.kernel.org/stable/c/7b5fe58959822e6cfa884327cabba6be3b01883d patch
https://git.kernel.org/stable/c/8e4e08ca4cc634b337bb74bc9a70758fdeda0bcb patch
https://git.kernel.org/stable/c/29e0cd296c87240278e2f7ea4cf3f496b60c03af patch
https://git.kernel.org/stable/c/90d302619ee7ce5ed0c69c29c290bdccfde66418 patch
https://git.kernel.org/stable/c/56cddf71cce3b15b078e937fadab29962b6f6643 patch
https://git.kernel.org/stable/c/597c27e5f04cb50e56cc9aeda75d3e42b6b89c3e patch
https://git.kernel.org/stable/c/a466fd7e9fafd975949e5945e2f70c33a94b1a70 patch

Frequently Asked Questions

What is the severity of CVE-2025-21904?
CVE-2025-21904 has been scored as a medium severity vulnerability.
How to fix CVE-2025-21904?
To fix CVE-2025-21904, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21904 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-21904 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21904?
CVE-2025-21904 affects Linux Linux, Linux Linux.
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