CVE-2024-26944 (GCVE-0-2024-26944)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:18 – Updated: 2025-05-21 08:05
VLAI?
Title
btrfs: zoned: fix use-after-free in do_zone_finish()
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix use-after-free in do_zone_finish() Shinichiro reported the following use-after-free triggered by the device replace operation in fstests btrfs/070. BTRFS info (device nullb1): scrub: finished on devid 1 with status: 0 ================================================================== BUG: KASAN: slab-use-after-free in do_zone_finish+0x91a/0xb90 [btrfs] Read of size 8 at addr ffff8881543c8060 by task btrfs-cleaner/3494007 CPU: 0 PID: 3494007 Comm: btrfs-cleaner Tainted: G W 6.8.0-rc5-kts #1 Hardware name: Supermicro Super Server/X11SPi-TF, BIOS 3.3 02/21/2020 Call Trace: <TASK> dump_stack_lvl+0x5b/0x90 print_report+0xcf/0x670 ? __virt_addr_valid+0x200/0x3e0 kasan_report+0xd8/0x110 ? do_zone_finish+0x91a/0xb90 [btrfs] ? do_zone_finish+0x91a/0xb90 [btrfs] do_zone_finish+0x91a/0xb90 [btrfs] btrfs_delete_unused_bgs+0x5e1/0x1750 [btrfs] ? __pfx_btrfs_delete_unused_bgs+0x10/0x10 [btrfs] ? btrfs_put_root+0x2d/0x220 [btrfs] ? btrfs_clean_one_deleted_snapshot+0x299/0x430 [btrfs] cleaner_kthread+0x21e/0x380 [btrfs] ? __pfx_cleaner_kthread+0x10/0x10 [btrfs] kthread+0x2e3/0x3c0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x31/0x70 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK> Allocated by task 3493983: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 __kasan_kmalloc+0xaa/0xb0 btrfs_alloc_device+0xb3/0x4e0 [btrfs] device_list_add.constprop.0+0x993/0x1630 [btrfs] btrfs_scan_one_device+0x219/0x3d0 [btrfs] btrfs_control_ioctl+0x26e/0x310 [btrfs] __x64_sys_ioctl+0x134/0x1b0 do_syscall_64+0x99/0x190 entry_SYSCALL_64_after_hwframe+0x6e/0x76 Freed by task 3494056: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3f/0x60 poison_slab_object+0x102/0x170 __kasan_slab_free+0x32/0x70 kfree+0x11b/0x320 btrfs_rm_dev_replace_free_srcdev+0xca/0x280 [btrfs] btrfs_dev_replace_finishing+0xd7e/0x14f0 [btrfs] btrfs_dev_replace_by_ioctl+0x1286/0x25a0 [btrfs] btrfs_ioctl+0xb27/0x57d0 [btrfs] __x64_sys_ioctl+0x134/0x1b0 do_syscall_64+0x99/0x190 entry_SYSCALL_64_after_hwframe+0x6e/0x76 The buggy address belongs to the object at ffff8881543c8000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 96 bytes inside of freed 1024-byte region [ffff8881543c8000, ffff8881543c8400) The buggy address belongs to the physical page: page:00000000fe2c1285 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1543c8 head:00000000fe2c1285 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x17ffffc0000840(slab|head|node=0|zone=2|lastcpupid=0x1fffff) page_type: 0xffffffff() raw: 0017ffffc0000840 ffff888100042dc0 ffffea0019e8f200 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881543c7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881543c7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881543c8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881543c8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881543c8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb This UAF happens because we're accessing stale zone information of a already removed btrfs_device in do_zone_finish(). The sequence of events is as follows: btrfs_dev_replace_start btrfs_scrub_dev btrfs_dev_replace_finishing btrfs_dev_replace_update_device_in_mapping_tree <-- devices replaced btrfs_rm_dev_replace_free_srcdev btrfs_free_device <-- device freed cleaner_kthread btrfs_delete_unused_bgs btrfs_zone_finish do_zone_finish <-- refers the freed device The reason for this is that we're using a ---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4dcbb8ab31c1292aea6a3f240e19523f633320c2 , < 34ca809e055eca5cfe63d9c7efbf80b7c21b4e57 (git)
Affected: 4dcbb8ab31c1292aea6a3f240e19523f633320c2 , < 1ec17ef59168a1a6f1105f5dc517f783839a5302 (git)
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    Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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    "vulnrichment": {
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__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  \u003c/TASK\u003e\\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 \u003effff8881543c8000: 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\u0027re 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 \u003c-- devices replaced\\n    btrfs_rm_dev_replace_free_srcdev\\n     btrfs_free_device                              \u003c-- device freed\\n\\ncleaner_kthread\\n btrfs_delete_unused_bgs\\n  btrfs_zone_finish\\n   do_zone_finish              \u003c-- refers the freed device\\n\\nThe reason for this is that we\u0027re using a\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.3\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-21T08:05:14.479Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26944\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-21T08:05:14.479Z\", \"dateReserved\": \"2024-02-19T14:20:24.197Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:18:04.909Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.