PT-2026-4480 · Linux+2 · Linux Kernel+2
Published
2026-01-01
·
Updated
2026-05-22
·
CVE-2026-22980
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A race condition exists in the NFS daemon (nfsd) related to handling grace periods during server shutdown. Specifically, writing to the
v4 end grace structure can occur concurrently with server shutdown, potentially leading to a use-after-free condition. This is due to a lack of proper locking mechanisms when accessing this structure. The issue involves a race between server shutdown, client tracking operations, and the landromat work queue. The fix introduces a new flag, client tracking active, protected by nn->client lock, to ensure safe client tracking calls. Another field, grace end forced, is used to bypass checks related to the completion of the grace period. The vulnerability can be triggered when writing to v4 end grace while the server is shutting down, potentially causing memory corruption.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Use After Free
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Linuxmint
Linux Kernel
Ubuntu