{"id":"CVE-2022-49152","summary":"XArray: Fix xas_create_range() when multi-order entry present","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nXArray: Fix xas_create_range() when multi-order entry present\n\nIf there is already an entry present that is of order \u003e= XA_CHUNK_SHIFT\nwhen we call xas_create_range(), xas_create_range() will misinterpret\nthat entry as a node and dereference xa_node-\u003eparent, generally leading\nto a crash that looks something like this:\n\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000001:\n0000 [#1] PREEMPT SMP KASAN\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\nCPU: 0 PID: 32 Comm: khugepaged Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0\nRIP: 0010:xa_parent_locked include/linux/xarray.h:1207 [inline]\nRIP: 0010:xas_create_range+0x2d9/0x6e0 lib/xarray.c:725\n\nIt's deterministically reproducable once you know what the problem is,\nbut producing it in a live kernel requires khugepaged to hit a race.\nWhile the problem has been present since xas_create_range() was\nintroduced, I'm not aware of a way to hit it before the page cache was\nconverted to use multi-index entries.","modified":"2026-04-02T08:27:20.667761Z","published":"2025-02-26T01:55:18.249Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49152.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/18f13edf3424b3b61814b69d5269b2e14584800c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3e3c658055c002900982513e289398a1aad4a488"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49152.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49152"},{"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":"6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3"},{"fixed":"18f13edf3424b3b61814b69d5269b2e14584800c"},{"fixed":"3e3c658055c002900982513e289398a1aad4a488"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49152.json"}}],"schema_version":"1.7.5"}