CVE-2025-38364
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)
How to fix
- linux linux_kernel6.1.146, 6.6.99, 6.12.36, 6.15.5 or later
- git.kernel.org/stable/c/9e32f4700867abbd5d19abfcf698dbd0d2ce36a4
- git.kernel.org/stable/c/cf95f8426f889949b738f51ffcd72884411f3a6a
- git.kernel.org/stable/c/d69cd64bd5af41c6fd409313504089970edaf02f
- git.kernel.org/stable/c/e63032e66bca1d06e600033f3369ba3db3af0870
- git.kernel.org/stable/c/fba46a5d83ca8decb338722fb4899026d8d9ead2
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.1 ≤ v < 6.1.146, 6.2 ≤ v < 6.6.99, 6.7 ≤ v < 6.12.36, 6.13 ≤ v < 6.15.5, 6.16 | 6.1.146, 6.6.99, 6.12.36, 6.15.5 |
| debian debian_linux | 11.0 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.