PT-2025-14289 · Linux+6 · Linux Kernel+6
Published
2025-02-24
·
Updated
2026-05-22
·
CVE-2025-21908
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A deadlock issue in the Linux kernel's NFS component has been resolved. The problem occurred when the
nfs release folio() function called nfs wb folio() from kcompactd, leading to a deadlock. This happened because NFS waited for kcompactd-induced writeback, which in turn recursed back to NFS, causing a block. The issue was identified by a task being blocked for more than 4435 seconds. Technical details include the use of the PF KCOMPACTD flag and the current is kcompactd() helper to prevent nfs release folio() from calling nfs wb folio() from kcompactd. The folio wait bit+0xe8/0x200, folio wait writeback+0x2b/0x80, nfs wb folio+0x80/0x1b0, and nfs release folio+0x68/0x130 functions were involved in the deadlock.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
DoS
Improper Locking
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Astra Linux
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu