{"id":"CVE-2022-49152","state":"PUBLISHED","title":"XArray: Fix xas_create_range() when multi-order entry present","description":"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 >= XA_CHUNK_SHIFT\nwhen we call xas_create_range(), xas_create_range() will misinterpret\nthat entry as a node and dereference xa_node->parent, 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.","publishedAt":"2025-02-26T01:55:18.249Z","updatedAt":"2026-05-11T18:54:08.688Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3","status":"affected","lessThan":"18f13edf3424b3b61814b69d5269b2e14584800c","versionType":"git"},{"version":"6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3","status":"affected","lessThan":"3e3c658055c002900982513e289398a1aad4a488","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["lib/test_xarray.c","lib/xarray.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"5.17.2","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["lib/test_xarray.c","lib/xarray.c"]}],"references":["https://git.kernel.org/stable/c/18f13edf3424b3b61814b69d5269b2e14584800c","https://git.kernel.org/stable/c/3e3c658055c002900982513e289398a1aad4a488"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49152.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49152","state":"PUBLISHED","datePublished":"2025-02-26T01:55:18.249Z","dateUpdated":"2026-05-11T18:54:08.688Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T01:49:39.274Z"},"containers":{"cna":{"title":"XArray: Fix xas_create_range() when multi-order entry present","descriptions":[{"lang":"en","value":"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 >= XA_CHUNK_SHIFT\nwhen we call xas_create_range(), xas_create_range() will misinterpret\nthat entry as a node and dereference xa_node->parent, 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3","status":"affected","lessThan":"18f13edf3424b3b61814b69d5269b2e14584800c","versionType":"git"},{"version":"6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3","status":"affected","lessThan":"3e3c658055c002900982513e289398a1aad4a488","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["lib/test_xarray.c","lib/xarray.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"5.17.2","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["lib/test_xarray.c","lib/xarray.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/18f13edf3424b3b61814b69d5269b2e14584800c"},{"url":"https://git.kernel.org/stable/c/3e3c658055c002900982513e289398a1aad4a488"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T18:54:08.688Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"5.17.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"5.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}