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)
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to < d69cd64bd5af41c6fd409313504089970edaf02faffected54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to < e63032e66bca1d06e600033f3369ba3db3af0870affected54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to < cf95f8426f889949b738f51ffcd72884411f3a6aaffected54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to < 9e32f4700867abbd5d19abfcf698dbd0d2ce36a4affected54a611b605901c7d5d05b6b8f5d04a6ceb0962aa to < fba46a5d83ca8decb338722fb4899026d8d9ead2affected
Linux Linux
Default version status: affected
6.1affected0 to < 6.1unaffected6.1.146 to ≤ 6.1.*unaffected6.6.99 to ≤ 6.6.*unaffected6.12.36 to ≤ 6.12.*unaffected6.15.5 to ≤ 6.15.*unaffected6.16 to ≤ *unaffected
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 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗