CVE-2026-90004
UnknownSummary
In the Linux kernel, mm/damon/core function damon_apply_min_nr_regions() assumes damon_split_region_at() always succeeds. On memory allocation failure and when the region was the last, fetching the next region returns an invalid pointer, leading to invalid memory dereference and corruption. The fix breaks all loops on any split failure.
Risk Assessment
It can lead to invalid memory dereference and kernel corruption, potentially causing system crash, though the likelihood is low due to small allocations.
Recommendation
Update the Linux kernel to a version with the fix that breaks all loops on any region split failure.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: handle region split failure in apply_min_nr_regions() damon_apply_min_nr_regions() repeatedly split each region until its size becomes small enough to meet the user-defined low limit of the number of regions. The loop assumes the split operation (damon_split_region_at()) will always succeed and create the new region. But the operation could silently fail for memory allocation failures, for example. If such failure happens and the region was the last region, the linked list-based next region fetching returns invalid pointer. As a result, invalid memory dereference and corruption could happen. Even if the corner case is handled, it imposes stress to the allocator by trying split regions for other targets. Fix the issue by breaking all the loops for any region split failure. This means there could be a min_nr_regions violation. It will only rarely happen since the allocation is arguably too small to fail. Even if it happens, it is only temporal. damon_apply_min_nr_regions() will be called again after the aggregation interval. The user impact of the issue should be minor, since the allocation is arguably too small to fail. But, it could still theoretically happen, and the consequence is very bad. This issue was discovered [1] by Sashiko.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS