{"api_version":"1","generated_at":"2026-08-04T23:37:20+00:00","cve":"CVE-2024-26944","urls":{"html":"https://cve.report/CVE-2024-26944","api":"https://cve.report/api/cve/CVE-2024-26944.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2024-26944","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-26944"},"summary":{"title":"btrfs: zoned: fix use-after-free in do_zone_finish()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix use-after-free in do_zone_finish()\n\nShinichiro reported the following use-after-free triggered by the device\nreplace operation in fstests btrfs/070.\n\n BTRFS info (device nullb1): scrub: finished on devid 1 with status: 0\n ==================================================================\n BUG: KASAN: slab-use-after-free in do_zone_finish+0x91a/0xb90 [btrfs]\n Read of size 8 at addr ffff8881543c8060 by task btrfs-cleaner/3494007\n\n CPU: 0 PID: 3494007 Comm: btrfs-cleaner Tainted: G        W          6.8.0-rc5-kts #1\n Hardware name: Supermicro Super Server/X11SPi-TF, BIOS 3.3 02/21/2020\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0x5b/0x90\n  print_report+0xcf/0x670\n  ? __virt_addr_valid+0x200/0x3e0\n  kasan_report+0xd8/0x110\n  ? do_zone_finish+0x91a/0xb90 [btrfs]\n  ? do_zone_finish+0x91a/0xb90 [btrfs]\n  do_zone_finish+0x91a/0xb90 [btrfs]\n  btrfs_delete_unused_bgs+0x5e1/0x1750 [btrfs]\n  ? __pfx_btrfs_delete_unused_bgs+0x10/0x10 [btrfs]\n  ? btrfs_put_root+0x2d/0x220 [btrfs]\n  ? btrfs_clean_one_deleted_snapshot+0x299/0x430 [btrfs]\n  cleaner_kthread+0x21e/0x380 [btrfs]\n  ? __pfx_cleaner_kthread+0x10/0x10 [btrfs]\n  kthread+0x2e3/0x3c0\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork+0x31/0x70\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork_asm+0x1b/0x30\n  </TASK>\n\n Allocated by task 3493983:\n  kasan_save_stack+0x33/0x60\n  kasan_save_track+0x14/0x30\n  __kasan_kmalloc+0xaa/0xb0\n  btrfs_alloc_device+0xb3/0x4e0 [btrfs]\n  device_list_add.constprop.0+0x993/0x1630 [btrfs]\n  btrfs_scan_one_device+0x219/0x3d0 [btrfs]\n  btrfs_control_ioctl+0x26e/0x310 [btrfs]\n  __x64_sys_ioctl+0x134/0x1b0\n  do_syscall_64+0x99/0x190\n  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\n Freed by task 3494056:\n  kasan_save_stack+0x33/0x60\n  kasan_save_track+0x14/0x30\n  kasan_save_free_info+0x3f/0x60\n  poison_slab_object+0x102/0x170\n  __kasan_slab_free+0x32/0x70\n  kfree+0x11b/0x320\n  btrfs_rm_dev_replace_free_srcdev+0xca/0x280 [btrfs]\n  btrfs_dev_replace_finishing+0xd7e/0x14f0 [btrfs]\n  btrfs_dev_replace_by_ioctl+0x1286/0x25a0 [btrfs]\n  btrfs_ioctl+0xb27/0x57d0 [btrfs]\n  __x64_sys_ioctl+0x134/0x1b0\n  do_syscall_64+0x99/0x190\n  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\n The buggy address belongs to the object at ffff8881543c8000\n  which belongs to the cache kmalloc-1k of size 1024\n The buggy address is located 96 bytes inside of\n  freed 1024-byte region [ffff8881543c8000, ffff8881543c8400)\n\n The buggy address belongs to the physical page:\n page:00000000fe2c1285 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1543c8\n head:00000000fe2c1285 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n flags: 0x17ffffc0000840(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n page_type: 0xffffffff()\n raw: 0017ffffc0000840 ffff888100042dc0 ffffea0019e8f200 dead000000000002\n raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffff8881543c7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff8881543c7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >ffff8881543c8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                                                        ^\n  ffff8881543c8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n  ffff8881543c8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nThis UAF happens because we're accessing stale zone information of a\nalready removed btrfs_device in do_zone_finish().\n\nThe sequence of events is as follows:\n\nbtrfs_dev_replace_start\n  btrfs_scrub_dev\n   btrfs_dev_replace_finishing\n    btrfs_dev_replace_update_device_in_mapping_tree <-- devices replaced\n    btrfs_rm_dev_replace_free_srcdev\n     btrfs_free_device                              <-- device freed\n\ncleaner_kthread\n btrfs_delete_unused_bgs\n  btrfs_zone_finish\n   do_zone_finish              <-- refers the freed device\n\nThe reason for this is that we're using a\n---truncated---","state":"PUBLISHED","assigner":"Linux","published_at":"2024-05-01 06:15:10","updated_at":"2026-08-04 11:17:24"},"problem_types":["CWE-416"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302","name":"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57","name":"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2024-26944","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26944","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dcbb8ab31c1292aea6a3f240e19523f633320c2 34ca809e055eca5cfe63d9c7efbf80b7c21b4e57 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4dcbb8ab31c1292aea6a3f240e19523f633320c2 1ec17ef59168a1a6f1105f5dc517f783839a5302 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8.3 6.8.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2024","cve_id":"26944","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2024","cve_id":"26944","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"6.9","cpe7":"rc1","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2024-26944","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA 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Container"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/btrfs/zoned.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"34ca809e055eca5cfe63d9c7efbf80b7c21b4e57","status":"affected","version":"4dcbb8ab31c1292aea6a3f240e19523f633320c2","versionType":"git"},{"lessThan":"1ec17ef59168a1a6f1105f5dc517f783839a5302","status":"affected","version":"4dcbb8ab31c1292aea6a3f240e19523f633320c2","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/btrfs/zoned.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.18"},{"lessThan":"5.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.8.*","status":"unaffected","version":"6.8.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.9","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.8.3","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.9","versionStartIncluding":"5.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix use-after-free in do_zone_finish()\n\nShinichiro reported the following use-after-free triggered by the device\nreplace operation in fstests btrfs/070.\n\n BTRFS info (device nullb1): scrub: finished on devid 1 with status: 0\n ==================================================================\n BUG: KASAN: slab-use-after-free in do_zone_finish+0x91a/0xb90 [btrfs]\n Read of size 8 at addr ffff8881543c8060 by task btrfs-cleaner/3494007\n\n CPU: 0 PID: 3494007 Comm: btrfs-cleaner Tainted: G        W          6.8.0-rc5-kts #1\n Hardware name: Supermicro Super Server/X11SPi-TF, BIOS 3.3 02/21/2020\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0x5b/0x90\n  print_report+0xcf/0x670\n  ? __virt_addr_valid+0x200/0x3e0\n  kasan_report+0xd8/0x110\n  ? do_zone_finish+0x91a/0xb90 [btrfs]\n  ? do_zone_finish+0x91a/0xb90 [btrfs]\n  do_zone_finish+0x91a/0xb90 [btrfs]\n  btrfs_delete_unused_bgs+0x5e1/0x1750 [btrfs]\n  ? __pfx_btrfs_delete_unused_bgs+0x10/0x10 [btrfs]\n  ? btrfs_put_root+0x2d/0x220 [btrfs]\n  ? btrfs_clean_one_deleted_snapshot+0x299/0x430 [btrfs]\n  cleaner_kthread+0x21e/0x380 [btrfs]\n  ? __pfx_cleaner_kthread+0x10/0x10 [btrfs]\n  kthread+0x2e3/0x3c0\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork+0x31/0x70\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork_asm+0x1b/0x30\n  </TASK>\n\n Allocated by task 3493983:\n  kasan_save_stack+0x33/0x60\n  kasan_save_track+0x14/0x30\n  __kasan_kmalloc+0xaa/0xb0\n  btrfs_alloc_device+0xb3/0x4e0 [btrfs]\n  device_list_add.constprop.0+0x993/0x1630 [btrfs]\n  btrfs_scan_one_device+0x219/0x3d0 [btrfs]\n  btrfs_control_ioctl+0x26e/0x310 [btrfs]\n  __x64_sys_ioctl+0x134/0x1b0\n  do_syscall_64+0x99/0x190\n  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\n Freed by task 3494056:\n  kasan_save_stack+0x33/0x60\n  kasan_save_track+0x14/0x30\n  kasan_save_free_info+0x3f/0x60\n  poison_slab_object+0x102/0x170\n  __kasan_slab_free+0x32/0x70\n  kfree+0x11b/0x320\n  btrfs_rm_dev_replace_free_srcdev+0xca/0x280 [btrfs]\n  btrfs_dev_replace_finishing+0xd7e/0x14f0 [btrfs]\n  btrfs_dev_replace_by_ioctl+0x1286/0x25a0 [btrfs]\n  btrfs_ioctl+0xb27/0x57d0 [btrfs]\n  __x64_sys_ioctl+0x134/0x1b0\n  do_syscall_64+0x99/0x190\n  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\n The buggy address belongs to the object at ffff8881543c8000\n  which belongs to the cache kmalloc-1k of size 1024\n The buggy address is located 96 bytes inside of\n  freed 1024-byte region [ffff8881543c8000, ffff8881543c8400)\n\n The buggy address belongs to the physical page:\n page:00000000fe2c1285 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1543c8\n head:00000000fe2c1285 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n flags: 0x17ffffc0000840(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n page_type: 0xffffffff()\n raw: 0017ffffc0000840 ffff888100042dc0 ffffea0019e8f200 dead000000000002\n raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffff8881543c7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff8881543c7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >ffff8881543c8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                                                        ^\n  ffff8881543c8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n  ffff8881543c8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nThis UAF happens because we're accessing stale zone information of a\nalready removed btrfs_device in do_zone_finish().\n\nThe sequence of events is as follows:\n\nbtrfs_dev_replace_start\n  btrfs_scrub_dev\n   btrfs_dev_replace_finishing\n    btrfs_dev_replace_update_device_in_mapping_tree <-- devices replaced\n    btrfs_rm_dev_replace_free_srcdev\n     btrfs_free_device                              <-- device freed\n\ncleaner_kthread\n btrfs_delete_unused_bgs\n  btrfs_zone_finish\n   do_zone_finish              <-- refers the freed device\n\nThe reason for this is that we're using a\n---truncated---"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:21:24.120Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57"},{"url":"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302"}],"title":"btrfs: zoned: fix use-after-free in do_zone_finish()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2024-26944","datePublished":"2024-05-01T05:18:04.909Z","dateReserved":"2024-02-19T14:20:24.197Z","dateUpdated":"2026-08-04T09:21:24.120Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2024-05-01 06:15:10","lastModifiedDate":"2026-08-04 11:17:24","problem_types":["CWE-416"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2024-05-28T17:52:17.817601Z","id":"CVE-2024-26944","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.8.3","matchCriteriaId":"37507A99-EDD7-48D9-80EE-8FFDB0704A2E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*","matchCriteriaId":"22BEDD49-2C6D-402D-9DBF-6646F6ECD10B"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2024","CveId":"26944","Ordinal":"1","Title":"btrfs: zoned: fix use-after-free in do_zone_finish()","CVE":"CVE-2024-26944","Year":"2024"},"notes":[{"CveYear":"2024","CveId":"26944","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix use-after-free in do_zone_finish()\n\nShinichiro reported the following use-after-free triggered by the device\nreplace operation in fstests btrfs/070.\n\n BTRFS info (device nullb1): scrub: finished on devid 1 with status: 0\n ==================================================================\n BUG: KASAN: slab-use-after-free in do_zone_finish+0x91a/0xb90 [btrfs]\n Read of size 8 at addr ffff8881543c8060 by task btrfs-cleaner/3494007\n\n CPU: 0 PID: 3494007 Comm: btrfs-cleaner Tainted: G        W          6.8.0-rc5-kts #1\n Hardware name: Supermicro Super Server/X11SPi-TF, BIOS 3.3 02/21/2020\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0x5b/0x90\n  print_report+0xcf/0x670\n  ? __virt_addr_valid+0x200/0x3e0\n  kasan_report+0xd8/0x110\n  ? do_zone_finish+0x91a/0xb90 [btrfs]\n  ? do_zone_finish+0x91a/0xb90 [btrfs]\n  do_zone_finish+0x91a/0xb90 [btrfs]\n  btrfs_delete_unused_bgs+0x5e1/0x1750 [btrfs]\n  ? __pfx_btrfs_delete_unused_bgs+0x10/0x10 [btrfs]\n  ? btrfs_put_root+0x2d/0x220 [btrfs]\n  ? btrfs_clean_one_deleted_snapshot+0x299/0x430 [btrfs]\n  cleaner_kthread+0x21e/0x380 [btrfs]\n  ? __pfx_cleaner_kthread+0x10/0x10 [btrfs]\n  kthread+0x2e3/0x3c0\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork+0x31/0x70\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork_asm+0x1b/0x30\n  </TASK>\n\n Allocated by task 3493983:\n  kasan_save_stack+0x33/0x60\n  kasan_save_track+0x14/0x30\n  __kasan_kmalloc+0xaa/0xb0\n  btrfs_alloc_device+0xb3/0x4e0 [btrfs]\n  device_list_add.constprop.0+0x993/0x1630 [btrfs]\n  btrfs_scan_one_device+0x219/0x3d0 [btrfs]\n  btrfs_control_ioctl+0x26e/0x310 [btrfs]\n  __x64_sys_ioctl+0x134/0x1b0\n  do_syscall_64+0x99/0x190\n  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\n Freed by task 3494056:\n  kasan_save_stack+0x33/0x60\n  kasan_save_track+0x14/0x30\n  kasan_save_free_info+0x3f/0x60\n  poison_slab_object+0x102/0x170\n  __kasan_slab_free+0x32/0x70\n  kfree+0x11b/0x320\n  btrfs_rm_dev_replace_free_srcdev+0xca/0x280 [btrfs]\n  btrfs_dev_replace_finishing+0xd7e/0x14f0 [btrfs]\n  btrfs_dev_replace_by_ioctl+0x1286/0x25a0 [btrfs]\n  btrfs_ioctl+0xb27/0x57d0 [btrfs]\n  __x64_sys_ioctl+0x134/0x1b0\n  do_syscall_64+0x99/0x190\n  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\n The buggy address belongs to the object at ffff8881543c8000\n  which belongs to the cache kmalloc-1k of size 1024\n The buggy address is located 96 bytes inside of\n  freed 1024-byte region [ffff8881543c8000, ffff8881543c8400)\n\n The buggy address belongs to the physical page:\n page:00000000fe2c1285 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1543c8\n head:00000000fe2c1285 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n flags: 0x17ffffc0000840(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\n page_type: 0xffffffff()\n raw: 0017ffffc0000840 ffff888100042dc0 ffffea0019e8f200 dead000000000002\n raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffff8881543c7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff8881543c7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >ffff8881543c8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                                                        ^\n  ffff8881543c8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n  ffff8881543c8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nThis UAF happens because we're accessing stale zone information of a\nalready removed btrfs_device in do_zone_finish().\n\nThe sequence of events is as follows:\n\nbtrfs_dev_replace_start\n  btrfs_scrub_dev\n   btrfs_dev_replace_finishing\n    btrfs_dev_replace_update_device_in_mapping_tree <-- devices replaced\n    btrfs_rm_dev_replace_free_srcdev\n     btrfs_free_device                              <-- device freed\n\ncleaner_kthread\n btrfs_delete_unused_bgs\n  btrfs_zone_finish\n   do_zone_finish              <-- refers the freed device\n\nThe reason for this is that we're using a\n---truncated---","Type":"Description","Title":"btrfs: zoned: fix use-after-free in do_zone_finish()"}]}}}