🛡️ CVE-2025-38364 — debian-linux

🟡 CVSS 5.5 — Medium ✅ No Known Exploit CWE-476 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

maple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate()

In the Linux kernel, the following vulnerability has been resolved:

maple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate()

Temporarily clear the preallocation flag when explicitly requesting

allocations. Pre-existing allocations are already counted against the

request through mas_node_count_gfp(), but the allocations will not happen

if the MA_STATE_PREALLOC flag is set. This flag is meant to avoid

re-allocating in bulk allocation mode, and to detect issues with

preallocation calculations.

The MA_STATE_PREALLOC flag should also always be set on zero allocations

so that detection of underflow allocations will print a WARN_ON() during

consumption.

User visible effect of this flaw is a WARN_ON() followed by a null pointer

dereference when subsequent requests for larger number of nodes is

ignored, such as the vma merge retry in mmap_region() caused by drivers

altering the vma flags (which happens in v6.6, at least)

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.

Weakness class

CVE-2025-38364 is classified as CWE-476: NULL Pointer Dereference. A pointer that can be null is used without a check, crashing the process.

Affected software

CVE-2025-38364 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.13.0 up to 6.15.5)
  • linux-kernel

Timeline and source

Published on 25 July 2025 and last revised on 17 June 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
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org
cert-portal.siemens.com

CVE-2025-38364 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 CWE-476
Public Exploit ✅ No
Source NVD
Published 2025-07-25
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.13.0 6.15.5
linux-kernel — —

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