CVE-2026-80956: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 преди 83e3116283ed2c6a6a1fa662862a4b4d7d2701a2; 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 преди 692037ae1a7cfacc2f0c22c6e034c1dfee0e553f; 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 преди 2df0fc042e299bae3c0f60ea5cd2af9285658e9f
• Linux Linux: 6.18; преди 6.18; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-80956
• https://nvd.nist.gov/vuln/detail/CVE-2026-80956
• https://git.kernel.org/stable/c/83e3116283ed2c6a6a1fa662862a4b4d7d2701a2
• https://git.kernel.org/stable/c/692037ae1a7cfacc2f0c22c6e034c1dfee0e553f
• https://git.kernel.org/stable/c/2df0fc042e299bae3c0f60ea5cd2af9285658e9f