{"id":"CVE-2026-80960","revision":"f3e83a2f39f144789f65793dc71716a3","records":[{"revision":"f3e83a2f39f144789f65793dc71716a3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80960","aliases":[],"title":"dm-pcache: validate on-media seg_num against the cache device size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate on-media seg_num against the cache device size\n\nseg_num is read from the crc32c-only superblock, so whoever supplies the\ncache device on a table load (CAP_SYS_ADMIN) controls it. It sizes\ncache->segments[] and is the value every later on-media segment id is\nbounded against, yet it is never checked against the device. Because\ncache_dev->mapping is the direct map of the pmem, CACHE_DEV_SEGMENT() for\na segment id past the device resolves to ordinary kernel memory beyond\nthe mapping; a new-cache init reaching such an id has cache_seg_init() ->\ncache_dev_zero_range() memset() 12 KiB over that memory -- an\nout-of-bounds write into the kernel heap at table load. A zero seg_num\nmakes the segment allocations ZERO_SIZE_PTR.\n\nReject a seg_num that is zero, larger than the device can hold, or larger\nthan PCACHE_CACHE_SEGS_MAX before it is used.","state":0,"publishedAt":"2026-09-11T19:42:27.182+00:00","modifiedAt":"2026-10-19T08:45:44.213+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/md/dm-pcache/cache_dev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0\",\n                            \"lessThan\": \"91b93fe5cf4d62d5ecc642a6c8f15a3c11b00e3c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0\",\n                            \"lessThan\": \"e889c0ee81165fc90aad2979b51f930f77895703\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0\",\n                            \"lessThan\": \"62d92e45abe9e087370f9fc5d876b95673aced34\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/md/dm-pcache/cache_dev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/91b93fe5cf4d62d5ecc642a6c8f15a3c11b00e3c","https://git.kernel.org/stable/c/e889c0ee81165fc90aad2979b51f930f77895703","https://git.kernel.org/stable/c/62d92e45abe9e087370f9fc5d876b95673aced34"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80960","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80960","identifiers":["CVE-2026-80960"]},"retained":false,"historicalAffected":[]}],"coverage":[]}