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)
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.147-1 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 6.12.37-1 |
| debian | sid | fixed | 6.12.37-1 |
| debian | trixie | fixed | 6.12.37-1 |
| linux-kernel | affected | 6.1.146 | |
| linux-kernel | 6.16 | affected | |
| debian | 11.0 | affected | |
References
- https://git.kernel.org/stable/c/9e32f4700867abbd5d19abfcf698dbd0d2ce36a4
- https://git.kernel.org/stable/c/cf95f8426f889949b738f51ffcd72884411f3a6a
- https://git.kernel.org/stable/c/d69cd64bd5af41c6fd409313504089970edaf02f
- https://git.kernel.org/stable/c/e63032e66bca1d06e600033f3369ba3db3af0870
- https://git.kernel.org/stable/c/fba46a5d83ca8decb338722fb4899026d8d9ead2
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://www.suse.com/security/cve/CVE-2025-38364.html
- https://security-tracker.debian.org/tracker/CVE-2025-38364
CWEs
CWE-476
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.