5.5

CVE-2025-38364

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)
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.1 < 6.1.146
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.99
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.36
Linux ≫ Linux Kernel Version >= 6.13 < 6.15.5
Linux ≫ Linux Kernel Version6.16 Updaterc1
Linux ≫ Linux Kernel Version6.16 Updaterc2
Linux ≫ Linux Kernel Version6.16 Updaterc3
Debian ≫ Debian Linux Version11.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.16% 0.052
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/9e32f4700867abbd5d19abfcf698dbd0d2ce36a4
Patch
https://git.kernel.org/stable/c/cf95f8426f889949b738f51ffcd72884411f3a6a
Patch
https://git.kernel.org/stable/c/d69cd64bd5af41c6fd409313504089970edaf02f
Patch
https://git.kernel.org/stable/c/e63032e66bca1d06e600033f3369ba3db3af0870
Patch
https://git.kernel.org/stable/c/fba46a5d83ca8decb338722fb4899026d8d9ead2
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html