{"id":"CVE-2026-90043","revision":"0cbda8697a394af0a06a91e236c526ca","records":[{"revision":"0cbda8697a394af0a06a91e236c526ca","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90043","aliases":[],"title":"zram: fix slot lock bit position on big-endian 64-bit","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix slot lock bit position on big-endian 64-bit\n\nThe slot lock is a bit operation on the whole __lock word, which flags and\nac_time alias as two u32s.  On little-endian the lock bit lands in the\nposition ZRAM_ENTRY_LOCK reserves in flags, so the aliasing works out.  On\n64-bit big-endian it lands in ac_time instead: with\nZRAM_TRACK_ENTRY_ACTIME enabled, storing the access time from\nmark_slot_accessed() or slot_free() wipes out the held lock bit, letting\nanother CPU take the same slot lock; an access time value with that bit\nset makes the slot look locked forever.\n\nShift the lock bit into the flags half of the word on big-endian 64-bit.","state":0,"publishedAt":"2026-09-16T10:33:40.907+00:00","modifiedAt":"2026-10-19T08:57:01.055+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/block/zram/zram_drv.c\",\n                        \"drivers/block/zram/zram_drv.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2e8ff2f51dde73a26b94aed2df4827177bd25e6e\",\n                            \"lessThan\": \"052b6b2d5fe97547bd2cdb73fa894f6cfea68b11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2e8ff2f51dde73a26b94aed2df4827177bd25e6e\",\n                            \"lessThan\": \"a8b5875741d416703e19ad8eeac6fce8a12bd6e4\",\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/block/zram/zram_drv.c\",\n                        \"drivers/block/zram/zram_drv.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\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":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/052b6b2d5fe97547bd2cdb73fa894f6cfea68b11","https://git.kernel.org/stable/c/a8b5875741d416703e19ad8eeac6fce8a12bd6e4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90043","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90043","identifiers":["CVE-2026-90043"]},"retained":false,"historicalAffected":[]}],"coverage":[]}