CVE-2025-38393
Published: July 26, 2025Last modified: July 26, 2025
Description
In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN We found a few different systems hung up in writeback waiting on the same page lock, and one task waiting on the NFS_LAYOUT_DRAIN bit in pnfs_update_layout(), however the pnfs_layout_hdr's plh_outstanding count was zero. It seems most likely that this is another race between the waiter and waker similar to commit ed0172af5d6f ("SUNRPC: Fix a race to wake a sync task"). Fix it up by applying the advised barrier.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 4.7 |
| Attack Vector | LOCAL |
| Attack complexity | HIGH |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.147-r0) |
| 25 LTS | linux-lts | Fixed (6.12.41-r0) | |
| Stream | linux-lts | Fixed (6.12.41-r0) |
References
- https://git.kernel.org/stable/c/08287df60bac5b008b6bcdb03053988335d3d282
- https://git.kernel.org/stable/c/1f4da20080718f258e189a2c5f515385fa393da6
- https://git.kernel.org/stable/c/864a54c1243ed3ca60baa4bc492dede1361f4c83
- https://git.kernel.org/stable/c/8846fd02c98da8b79e6343a20e6071be6f372180
- https://git.kernel.org/stable/c/8ca65fa71024a1767a59ffbc6a6e2278af84735e
- https://git.kernel.org/stable/c/c01776287414ca43412d1319d2877cbad65444ac
- https://git.kernel.org/stable/c/e4b13885e7ef1e64e45268feef1e5f0707c47e72
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html