CVE-2025-38364

maple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate()

State: Published
Severity: Not scored
Published: Jul 25, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

Description

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)

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before d69cd64bd5af41c6fd409313504089970edaf02fAffected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before e63032e66bca1d06e600033f3369ba3db3af0870Affected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before cf95f8426f889949b738f51ffcd72884411f3a6aAffected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before 9e32f4700867abbd5d19abfcf698dbd0d2ce36a4Affected 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before fba46a5d83ca8decb338722fb4899026d8d9ead2Affected
LinuxLinux	6.1Affected before 6.1Not affected 6.1.146 through 6.1.Not affected 6.6.99 through 6.6.Not affected 6.12.36 through 6.12.Not affected 6.15.5 through 6.15.Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before d69cd64bd5af41c6fd409313504089970edaf02fAffected
54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before e63032e66bca1d06e600033f3369ba3db3af0870Affected
54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before cf95f8426f889949b738f51ffcd72884411f3a6aAffected
54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before 9e32f4700867abbd5d19abfcf698dbd0d2ce36a4Affected
54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to before fba46a5d83ca8decb338722fb4899026d8d9ead2Affected

LinuxLinux

6.1Affected
before 6.1Not affected
6.1.146 through 6.1.*Not affected
6.6.99 through 6.6.*Not affected
6.12.36 through 6.12.*Not affected
6.15.5 through 6.15.*Not affected
6.16 and laterNot affected

References

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