CVE-2026-80956dm-pcache: only hand out initialized cache segments
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before 83e3116283ed2c6a6a1fa662862a4b4d7d2701a2; from 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before 692037ae1a7cfacc2f0c22c6e034c1dfee0e553f; from 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before 2df0fc042e299bae3c0f60ea5cd2af9285658e9f | CNA record |
References
- https://git.kernel.org/stable/c/83e3116283ed2c6a6a1fa662862a4b4d7d2701a2
- https://git.kernel.org/stable/c/692037ae1a7cfacc2f0c22c6e034c1dfee0e553f
- https://git.kernel.org/stable/c/2df0fc042e299bae3c0f60ea5cd2af9285658e9f
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.