maple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-38364
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-07-25 13:15:25 UTC
Updated2026-05-12 13:16:48 UTC
DescriptionIn 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)

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa d69cd64bd5af41c6fd409313504089970edaf02f git Not specified
CNA Linux Linux affected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa e63032e66bca1d06e600033f3369ba3db3af0870 git Not specified
CNA Linux Linux affected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa cf95f8426f889949b738f51ffcd72884411f3a6a git Not specified
CNA Linux Linux affected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa 9e32f4700867abbd5d19abfcf698dbd0d2ce36a4 git Not specified
CNA Linux Linux affected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa fba46a5d83ca8decb338722fb4899026d8d9ead2 git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.1.146 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.99 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.36 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.5 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
git.kernel.org/stable/c/cf95f8426f889949b738f51ffcd72884411f3a6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/d69cd64bd5af41c6fd409313504089970edaf02f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9e32f4700867abbd5d19abfcf698dbd0d2ce36a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e63032e66bca1d06e600033f3369ba3db3af0870 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fba46a5d83ca8decb338722fb4899026d8d9ead2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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