{"id":"CVE-2026-80962","summary":"dm-pcache: validate geometry fields from on-disk cache_info","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate geometry fields from on-disk cache_info\n\ncache_segs_init() iterates cache_info-\u003en_segs times indexing\ncache-\u003esegments[], which is sized to the cache device geometry, and\nget_seg_id() takes each segment id from the on-media cache_info and the\nper-segment next_seg link. Both come from cache device metadata that is\nonly CRC-protected with a fixed public seed, so whoever supplies the\ncache device on a table load (CAP_SYS_ADMIN) controls them: an oversized\nn_segs or an out-of-range id drives an out-of-bounds access of\ncache-\u003esegments[] and a wild CACHE_DEV_SEGMENT() pointer into the device\nmapping -- an out-of-bounds read and write from on-disk data.\n\nReject an n_segs that exceeds the device segment count and a segment id\nthat is out of range before either is used. Valid metadata is unaffected.","modified":"2026-09-13T03:46:57.508561499Z","published":"2026-09-11T19:42:28.500Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80962.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/32d1809da31094ef76fd98dc1f1a8b55ca1295dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3e19172089ec81132a8a48e802b1034a744209f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ab5dcde6fa96bc115b85f3621c60e39c66229a90"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80962.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80962"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0"},{"fixed":"ab5dcde6fa96bc115b85f3621c60e39c66229a90"},{"fixed":"3e19172089ec81132a8a48e802b1034a744209f4"},{"fixed":"32d1809da31094ef76fd98dc1f1a8b55ca1295dd"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80962.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80962.json"}}],"schema_version":"1.9.0"}