Not yet scoredPublished Jul 25, 2025

CVE-2025-38364maple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate()

Updated under an hour ago (Oct 28, 2026, 2:50 AM ET)

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Exploited in the last 30 days

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)

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Not yet received
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa before d69cd64bd5af41c6fd409313504089970edaf02f; from 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa before e63032e66bca1d06e600033f3369ba3db3af0870; from 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa before cf95f8426f889949b738f51ffcd72884411f3a6a; 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa builds before 9e32f4700867abbd5d19abfcf698dbd0d2ce36a4; from 54a611b605901c7d5d05b6b8f5d04a6ceb0962aa before fba46a5d83ca8decb338722fb4899026d8d9ead2	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP

References

References

https://git.kernel.org/stable/c/d69cd64bd5af41c6fd409313504089970edaf02f
https://git.kernel.org/stable/c/e63032e66bca1d06e600033f3369ba3db3af0870
https://git.kernel.org/stable/c/cf95f8426f889949b738f51ffcd72884411f3a6a
https://git.kernel.org/stable/c/9e32f4700867abbd5d19abfcf698dbd0d2ce36a4
https://git.kernel.org/stable/c/fba46a5d83ca8decb338722fb4899026d8d9ead2

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.