CVE-2026-80956
Last modified
CVE-2026-80956 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: dm-pcache: only hand out initialized cache segments get_cache_segment() scans the segment map up to cache->n_segs, the physical device segment count, but cache_segs_init() only initializes the first cache_info->n_segs segments. A crafted image with cache_info->n_segs smaller than the device count leaves the remaining pcache_cache_segment structs zeroed (segment.data == NULL), and the allocator can hand one to cache_kset_close(), which writes through the returned segment's data pointer with no NULL check. Bound the allocator's search to cache_info->n_segs so only initialized segments are ever returned.
Description
In the Linux kernel, the following vulnerability has been resolved: dm-pcache: only hand out initialized cache segments get_cache_segment() scans the segment map up to cache->n_segs, the physical device segment count, but cache_segs_init() only initializes the first cache_info->n_segs segments. A crafted image with cache_info->n_segs smaller than the device count leaves the remaining pcache_cache_segment structs zeroed (segment.data == NULL), and the allocator can hand one to cache_kset_close(), which writes through the returned segment's data pointer with no NULL check. Bound the allocator's search to cache_info->n_segs so only initialized segments are ever returned. A conforming cache sets n_segs equal to the device segment count, so this rejects nothing legitimate.
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, < 83e3116283ed2c6a6a1fa662862a4b4d7d2701a2; >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, < 692037ae1a7cfacc2f0c22c6e034c1dfee0e553f; >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, < 2df0fc042e299bae3c0f60ea5cd2af9285658e9f |
| Linux | Linux | 6.18 |
References
Timeline
- Published
- Last Modified
- Status
- Received
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