🛡️ CVE-2026-46256 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages

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").

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-46256 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 6.19.4)
  • linux-kernel (from 6.19 up to 6.19.4)
  • unknown

Timeline and source

Published on 3 June 2026 and last revised on 24 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-46256 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-06-03
Updated 2026-08-12
Modified 2026-07-24

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.4
linux-kernel 6.19 6.19.4
unknown — —

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