CVE-2024-26944 (GCVE-0-2024-26944)
Vulnerability from cvelistv5 – Published: 2024-05-01 05:18 – Updated: 2026-08-05 11:28
VLAI
EPSS
VEX
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
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-28 17:52 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4dcbb8ab31c1292aea6a3f240e19523f633320c2 , < 34ca809e055eca5cfe63d9c7efbf80b7c21b4e57
(git)
Affected: 4dcbb8ab31c1292aea6a3f240e19523f633320c2 , < 1ec17ef59168a1a6f1105f5dc517f783839a5302 (git) |
guessed | |
| Linux | Linux |
Affected:
5.18
Unaffected: 0 , < 5.18 (semver) Unaffected: 6.8.3 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": [
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"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 \u003cTASK\u003e\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 \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---"
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"value": "AV:L - The vulnerability is reached through ordinary local filesystem activity (writes, deletions, ordered-extent completion, unused-block-group cleanup) on a mounted zoned btrfs; there is no network-facing component.\nAC:L - Once a device replace has completed, `block_group-\u003ephysical_map` holds a permanently dangling `btrfs_device` pointer, so triggering `do_zone_finish()` via ordinary file I/O is deterministic and requires winning no race; the reporter reproduced it with a stock fstests run (btrfs/070).\nPR:L - The attacker needs only write access to the mounted zoned btrfs to drive `btrfs_zone_finish_endio()`/`btrfs_delete_unused_bgs()` into the freed device, and can additionally groom the kmalloc-1k slab from unprivileged context; the CAP_SYS_ADMIN device replace that creates the dangling pointer is routine admin maintenance (the primary use case for zoned btrfs on SMR drives), not a privilege the attacker must hold.\nUI:N - After the stale pointer exists, the btrfs cleaner kthread and normal write-completion paths call `do_zone_finish()` automatically, and the attacker can force them with their own file operations without any victim action.\nS:U - The corruption is confined to kernel slab memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed 1KB `btrfs_device` and `btrfs_zoned_device_info` objects are read after free, and slab grooming lets the attacker control the reallocated contents, turning `device-\u003ezone_info`/`device-\u003ebdev` dereferences into an attacker-directed kernel read primitive.\nI:H - `do_zone_finish()` performs UAF writes \u2014 `zinfo-\u003ereserved_active_zones++`, `atomic_inc(\u0026zone_info-\u003eactive_zones_left)`, and `test_and_clear_bit(zno, zone_info-\u003eactive_zones)` with pointer and index both taken from freed memory \u2014 giving a controllable write/bit-clear primitive usable for control-flow hijacking, plus zone-management commands issued through a dangling `bdev`.\nA:H - The bug is a KASAN-confirmed slab use-after-free in the btrfs cleaner kthread that reliably oopses or panics the kernel, and it also drives blkdev_zone_mgmt() with freed block-device state."
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"fkie_nvd": {
"configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"6.8.3\", \"matchCriteriaId\": \"45CAC835-1C61-4C27-A919-EF08207D3099\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*\", \"matchCriteriaId\": \"22BEDD49-2C6D-402D-9DBF-6646F6ECD10B\"}]}]}]",
"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 \u003cTASK\u003e\\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 \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---\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: btrfs:zoned: corrige use-after-free en do_zone_finish() Shinichiro inform\\u00f3 el siguiente use-after-free desencadenado por la operaci\\u00f3n de reemplazo de dispositivo en fstests btrfs/070. Informaci\\u00f3n BTRFS (dispositivo nullb1): limpieza: finalizado en el dispositivo 1 con estado: 0 ================================== ================================= ERROR: KASAN: uso de losa despu\\u00e9s de liberarlo en do_zone_finish+0x91a/0xb90 [btrfs] Lectura del tama\\u00f1o 8 en la direcci\\u00f3n ffff8881543c8060 mediante la tarea btrfs-cleaner/3494007 CPU: 0 PID: 3494007 Comm: btrfs-cleaner Contaminado: GW 6.8.0-rc5-kts #1 Nombre del hardware: Supermicro Super Server/X11SPi-TF , BIOS 3.3 21/02/2020 Seguimiento de llamadas: 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] clean_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 Asignado por tarea 3493983: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 __kasan_kmalloc+0xaa/0xb0 btrfs_alloc_device+0x b3/0x4e0 [btrfs] lista_dispositivo_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 entrada_SYSCALL_6 4_after_hwframe+0x6e/0x76 Liberado por la tarea 3494056: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3f/0x60 veneno_slab_object+0x102/0x170 __kasan_slab_free+0x32/0x70 kfree+0x11b/0x320 btrfs_rm_dev_replace_free_srcdev+0xca/0x280 [btrfs_dev_replace_finishing+0xd 7e/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 La direcci\\u00f3n con errores pertenece al objeto en ffff8881543c8000 que pertenece al cach\\u00e9 kmalloc-1k de tama\\u00f1o 1024 Se encuentra la direcci\\u00f3n con errores 96 bytes dentro de los 1024 bytes liberados regi\\u00f3n [ffff8881543c8000, ffff8881543c8400) La direcci\\u00f3n del error pertenece a la p\\u00e1gina f\\u00edsica: p\\u00e1gina:00000000fe2c1285 refcount:1 mapcount:0 mapeo:00000000000000000 index:0x0 pfn:0x1543c8 head:00000000fe2c1285 entero_mapcount:0 nr_pages_mapped:0 pincount:0 banderas: 0x17ffffc0000840(slab|head|node=0|zone=2|lastcpupid=0x1fffff) tipo de p\\u00e1gina: 0xffffffff() raw: 0017ffffc0000840 ffff888100042dc0 ffffea0019e8f200 dead000000000002 raw: 0000000000 0000000000100010 00000001ffffffff 0000000000000000 p\\u00e1gina volcada porque: kasan: mal acceso detectado Estado de la memoria alrededor de la direcci\\u00f3n con errores : 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 \u0026gt;ffff8881543c8000: fa 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 ffff8881543c8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb Esta UAF sucede porque estamos acceder a informaci\\u00f3n de zona obsoleta de un btrfs_device ya eliminado en do_zone_finish(). La secuencia de eventos es la siguiente: btrfs_dev_replace_start btrfs_scrub_dev btrfs_dev_replace_finishing btrfs_dev_replace_update_device_in_mapping_tree \u0026lt;-- dispositivos reemplazados btrfs_rm_dev_replace_free_srcdev btrfs_free_device \u0026lt;-- dispositivo liberado clean_kthread btrfs_delete_unused_ bgs btrfs_zone_finish do_zone_finish \u0026lt;-- hace referencia al dispositivo liberado. La raz\\u00f3n de esto es que estamos usando un ---truncado ---\"}]",
"id": "CVE-2024-26944",
"lastModified": "2025-01-14T14:29:21.517",
"metrics": "{\"cvssMetricV31\": [{\"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}]}",
"published": "2024-05-01T06:15:10.010",
"references": "[{\"url\": \"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
},
"microsoft_vex": {
"current_release_date": "2026-06-28T02:03:22.000Z",
"cve": "CVE-2024-26944",
"id": "msrc_CVE-2024-26944",
"initial_release_date": "2024-05-02T07:00:00.000Z",
"product_status:known_affected": "17",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "btrfs: zoned: fix use-after-free in do_zone_finish()",
"url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-26944.json",
"version": "14"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2024-26944\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-01T06:15:10.010\",\"lastModified\":\"2026-08-04T11:17:24.413\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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 \u003cTASK\u003e\\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 \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---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: btrfs:zoned: corrige use-after-free en do_zone_finish() Shinichiro inform\u00f3 el siguiente use-after-free desencadenado por la operaci\u00f3n de reemplazo de dispositivo en fstests btrfs/070. Informaci\u00f3n BTRFS (dispositivo nullb1): limpieza: finalizado en el dispositivo 1 con estado: 0 ================================== ================================= ERROR: KASAN: uso de losa despu\u00e9s de liberarlo en do_zone_finish+0x91a/0xb90 [btrfs] Lectura del tama\u00f1o 8 en la direcci\u00f3n ffff8881543c8060 mediante la tarea btrfs-cleaner/3494007 CPU: 0 PID: 3494007 Comm: btrfs-cleaner Contaminado: GW 6.8.0-rc5-kts #1 Nombre del hardware: Supermicro Super Server/X11SPi-TF , BIOS 3.3 21/02/2020 Seguimiento de llamadas: 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] clean_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 Asignado por tarea 3493983: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 __kasan_kmalloc+0xaa/0xb0 btrfs_alloc_device+0x b3/0x4e0 [btrfs] lista_dispositivo_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 entrada_SYSCALL_6 4_after_hwframe+0x6e/0x76 Liberado por la tarea 3494056: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3f/0x60 veneno_slab_object+0x102/0x170 __kasan_slab_free+0x32/0x70 kfree+0x11b/0x320 btrfs_rm_dev_replace_free_srcdev+0xca/0x280 [btrfs_dev_replace_finishing+0xd 7e/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 La direcci\u00f3n con errores pertenece al objeto en ffff8881543c8000 que pertenece al cach\u00e9 kmalloc-1k de tama\u00f1o 1024 Se encuentra la direcci\u00f3n con errores 96 bytes dentro de los 1024 bytes liberados regi\u00f3n [ffff8881543c8000, ffff8881543c8400) La direcci\u00f3n del error pertenece a la p\u00e1gina f\u00edsica: p\u00e1gina:00000000fe2c1285 refcount:1 mapcount:0 mapeo:00000000000000000 index:0x0 pfn:0x1543c8 head:00000000fe2c1285 entero_mapcount:0 nr_pages_mapped:0 pincount:0 banderas: 0x17ffffc0000840(slab|head|node=0|zone=2|lastcpupid=0x1fffff) tipo de p\u00e1gina: 0xffffffff() raw: 0017ffffc0000840 ffff888100042dc0 ffffea0019e8f200 dead000000000002 raw: 0000000000 0000000000100010 00000001ffffffff 0000000000000000 p\u00e1gina volcada porque: kasan: mal acceso detectado Estado de la memoria alrededor de la direcci\u00f3n con errores : 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 \u0026gt;ffff8881543c8000: fa 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 ffff8881543c8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb Esta UAF sucede porque estamos acceder a informaci\u00f3n de zona obsoleta de un btrfs_device ya eliminado en do_zone_finish(). La secuencia de eventos es la siguiente: btrfs_dev_replace_start btrfs_scrub_dev btrfs_dev_replace_finishing btrfs_dev_replace_update_device_in_mapping_tree \u0026lt;-- dispositivos reemplazados btrfs_rm_dev_replace_free_srcdev btrfs_free_device \u0026lt;-- dispositivo liberado clean_kthread btrfs_delete_unused_ bgs btrfs_zone_finish do_zone_finish \u0026lt;-- hace referencia al dispositivo liberado. La raz\u00f3n de esto es que estamos usando un ---truncado ---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/btrfs/zoned.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4dcbb8ab31c1292aea6a3f240e19523f633320c2\",\"lessThan\":\"34ca809e055eca5cfe63d9c7efbf80b7c21b4e57\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4dcbb8ab31c1292aea6a3f240e19523f633320c2\",\"lessThan\":\"1ec17ef59168a1a6f1105f5dc517f783839a5302\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/btrfs/zoned.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8.3\",\"lessThanOrEqual\":\"6.8.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"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\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-18T14:14:49+00:00",
"cve": "CVE-2024-26944",
"id": "CVE-2024-26944",
"initial_release_date": "2024-05-01T00:00:00+00:00",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: btrfs: zoned: fix use-after-free in do_zone_finish()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26944.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-09T00:33:22Z",
"cve": "CVE-2024-26944",
"id": "CVE-2024-26944",
"initial_release_date": "2024-05-03T02:09:50Z",
"product_status:known_affected": "394",
"product_status:known_not_affected": "368",
"product_status:recommended": "435",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2024-26944",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26944.json",
"version": "86"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T00:21:05.525Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26944\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-28T17:52:17.817601Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-28T17:52:23.464Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"btrfs: zoned: fix use-after-free in do_zone_finish()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerability is reached through ordinary local filesystem activity (writes, deletions, ordered-extent completion, unused-block-group cleanup) on a mounted zoned btrfs; there is no network-facing component.\\nAC:L - Once a device replace has completed, `block_group-\u003ephysical_map` holds a permanently dangling `btrfs_device` pointer, so triggering `do_zone_finish()` via ordinary file I/O is deterministic and requires winning no race; the reporter reproduced it with a stock fstests run (btrfs/070).\\nPR:L - The attacker needs only write access to the mounted zoned btrfs to drive `btrfs_zone_finish_endio()`/`btrfs_delete_unused_bgs()` into the freed device, and can additionally groom the kmalloc-1k slab from unprivileged context; the CAP_SYS_ADMIN device replace that creates the dangling pointer is routine admin maintenance (the primary use case for zoned btrfs on SMR drives), not a privilege the attacker must hold.\\nUI:N - After the stale pointer exists, the btrfs cleaner kthread and normal write-completion paths call `do_zone_finish()` automatically, and the attacker can force them with their own file operations without any victim action.\\nS:U - The corruption is confined to kernel slab memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The freed 1KB `btrfs_device` and `btrfs_zoned_device_info` objects are read after free, and slab grooming lets the attacker control the reallocated contents, turning `device-\u003ezone_info`/`device-\u003ebdev` dereferences into an attacker-directed kernel read primitive.\\nI:H - `do_zone_finish()` performs UAF writes \\u2014 `zinfo-\u003ereserved_active_zones++`, `atomic_inc(\u0026zone_info-\u003eactive_zones_left)`, and `test_and_clear_bit(zno, zone_info-\u003eactive_zones)` with pointer and index both taken from freed memory \\u2014 giving a controllable write/bit-clear primitive usable for control-flow hijacking, plus zone-management commands issued through a dangling `bdev`.\\nA:H - The bug is a KASAN-confirmed slab use-after-free in the btrfs cleaner kthread that reliably oopses or panics the kernel, and it also drives blkdev_zone_mgmt() with freed block-device state.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4dcbb8ab31c1292aea6a3f240e19523f633320c2\", \"lessThan\": \"34ca809e055eca5cfe63d9c7efbf80b7c21b4e57\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4dcbb8ab31c1292aea6a3f240e19523f633320c2\", \"lessThan\": \"1ec17ef59168a1a6f1105f5dc517f783839a5302\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/btrfs/zoned.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.8.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/btrfs/zoned.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/34ca809e055eca5cfe63d9c7efbf80b7c21b4e57\"}, {\"url\": \"https://git.kernel.org/stable/c/1ec17ef59168a1a6f1105f5dc517f783839a5302\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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 \u003cTASK\u003e\\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 \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\": \"2026-08-05T11:28:29.917Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-26944\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:28:29.917Z\", \"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": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- 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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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