Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: psp: check for device unregister when creating assoc psp_assoc_device_get_locked() obtains a psp_dev reference via psp_dev_get_for_sock() (which uses psp_dev_tryget() under RCU); it then acquires psd->lock and drops the reference. Before the lock is taken, psp_dev_unregister() can run to completion: take psd->lock, clear out state, unlock, drop the registration reference. The expectation is that the lock prevents device unregistration, but much like with netdevs special care has to be taken when "upgrading" a reference to a locked device. Add the missing check if device is still alive. psp_dev_is_registered() exists already but had no callers, which makes me wonder if I either forgot to add this or lost the check during refactoring...
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.18, < 6.18.33 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/b89769f936a8fa9e66de72ddc1b71a9745a488e6Patch
- https://git.kernel.org/stable/c/d90df5ce6deb2424de3ad89bcc693ac1b67accc9Patch
- https://git.kernel.org/stable/c/e201c57073e624dd2ba5beaf9eda31e19b77b332Patch
FAQ
What is CVE-2026-52979?
CVE-2026-52979 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: net: psp: check for device unregister when creating assoc psp_assoc_device_get_locked() obtains a psp_dev reference via psp_dev_ge...
How severe is CVE-2026-52979?
CVE-2026-52979 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-52979?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.