CVE-2026-46256 Details
Description
In the Linux kernel, the following vulnerability has been resolved: NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages LOCALIO is an NFS loopback mount optimization that avoids using the network for READ, WRITE and COMMIT if the NFS client and server are determined to be on the same system. But because LOCALIO is still fundamentally "just NFS loopback mount" it is susceptible to recursion deadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then back into NFS via nfs_writepages. Fix LOCALIO's potential for direct reclaim deadlock by ensuring that all its page cache allocations are done from GFP_NOFS context. Thanks to Ben Coddington for pointing out commit ad22c7a043c2 ("xfs: prevent stack overflows from page cache allocation").
A vulnerability in the Linux kernel's NFS LOCALIO optimization can lead to a direct reclaim recursion deadlock. LOCALIO is designed to bypass network operations for NFS commands when the client and server are on the same system. However, this loopback mount can inadvertently cause a deadlock by recursing through the direct reclaim process, particularly when interacting with the XFS filesystem. The issue arises because LOCALIO can loop back into NFS during the reclaim process, creating a potential deadlock scenario.
The vulnerability has been addressed by modifying the LOCALIO implementation to ensure that all page cache allocations are made from a context that prevents direct reclaim recursion. Users should apply the latest patches available in the Linux kernel stable tree to mitigate this issue.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/67435d2d8a33a75f9647724952cb1b18279d2e95 | kernel.org | Patch |
| https://git.kernel.org/stable/c/6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ae26a4cf2baf0a44c538dc093504d1994b02dade | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-667 | Improper Locking | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.12, < 6.18.14 >= 6.19, < 6.19.4 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jun 9, 2026 | Initial Analysis | [email protected] |
| Jun 3, 2026 | New CVE Received | kernel.org |