CVE-2022-50534
published 2025-10-07CVE-2022-50534: In the Linux kernel, the following vulnerability has been resolved: dm thin: Use last transaction's pmd->root when commit failed Recently we found a softlock…
PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.15%
4.7th percentile
In the Linux kernel, the following vulnerability has been resolved:
dm thin: Use last transaction's pmd->root when commit failed
Recently we found a softlock up problem in dm thin pool btree lookup
code due to corrupted metadata:
Kernel panic - not syncing: softlockup: hung tasks
CPU: 7 PID: 2669225 Comm: kworker/u16:3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Workqueue: dm-thin do_worker [dm_thin_pool]
Call Trace:
dump_stack+0x9c/0xd3
panic+0x35d/0x6b9
watchdog_timer_fn.cold+0x16/0x25
__run_hrtimer+0xa2/0x2d0
RIP: 0010:__relink_lru+0x102/0x220 [dm_bufio]
__bufio_new+0x11f/0x4f0 [dm_bufio]
new_read+0xa3/0x1e0 [dm_bufio]
dm_bm_read_lock+0x33/0xd0 [dm_persistent_data]
ro_step+0x63/0x100 [dm_persistent_data]
btree_lookup_raw.constprop.0+0x44/0x220 [dm_persistent_data]
dm_btree_lookup+0x16f/0x210 [dm_persistent_data]
dm_thin_find_block+0x12c/0x210 [dm_thin_pool]
__process_bio_read_only+0xc5/0x400 [dm_thin_pool]
process_thin_deferred_bios+0x1a4/0x4a0 [dm_thin_pool]
process_one_work+0x3c5/0x730
Following process may generate a broken btree mixed with fresh and
stale btree nodes, which could get dm thin trapped in an infinite loop
while looking up data block:
Transaction 1: pmd->root = A, A->B->C // One path in btree
pmd->root = X, X->Y->Z // Copy-up
Transaction 2: X,Z is updated on disk, Y write failed.
// Commit failed, dm thin becomes read-only.
process_bio_read_only
dm_thin_find_block
__find_block
dm_btree_lookup(pmd->root)
The pmd->root points to a broken btree, Y may contain stale node
pointing to any block, for example X, which gets dm thin trapped into
a dead loop while looking up Z.
Fix this by setting pmd->root in __open_metadata(), so that dm thin
will use the last transaction's pmd->root if commit failed.
Fetch a reproducer in [Link].
Linke: https://bugzilla.kernel.org/show_bug.cgi?id=216790
Affected
23 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.4-1 (bookworm) | linux 6.1.4-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < b35a22760aa5008d82533e59b0f0b5eb1b02d4e5 | b35a22760aa5008d82533e59b0f0b5eb1b02d4e5 |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < 87d69b8824ca9b090f5a8ed47f758e8f6eecb871 | 87d69b8824ca9b090f5a8ed47f758e8f6eecb871 |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < 3db757ffdd87ed8d7118b2250236a496502a660f | 3db757ffdd87ed8d7118b2250236a496502a660f |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < f758987ff0af3a4b5ee69e95cab6a5294e4367b0 | f758987ff0af3a4b5ee69e95cab6a5294e4367b0 |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < 94f01ecc2aa0be992865acc80ebb6701f731f955 | 94f01ecc2aa0be992865acc80ebb6701f731f955 |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < 4b710e8481ade7c9200e94d3018e99dc42a0a0e8 | 4b710e8481ade7c9200e94d3018e99dc42a0a0e8 |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < a63ce4eca86fd207e3db07c00fb7ccf4adf1b230 | a63ce4eca86fd207e3db07c00fb7ccf4adf1b230 |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < b91f481300e3a10eaf66b94fc39b740928762aaf | b91f481300e3a10eaf66b94fc39b740928762aaf |
| linux | linux | >= 991d9fa02da0dd1f843dc011376965e0c8c6c9b5 < 7991dbff6849f67e823b7cc0c15e5a90b0549b9f | 7991dbff6849f67e823b7cc0c15e5a90b0549b9f |
| linux | linux_kernel | >= 0 < 5.10.178-1 | 5.10.178-1 |
| linux | linux_kernel | >= 0 < 6.1.4-1 | 6.1.4-1 |
| linux | linux_kernel | >= 0 < 6.1.4-1 | 6.1.4-1 |
| linux | linux_kernel | >= 0 < 6.1.4-1 | 6.1.4-1 |
| linux | linux_kernel | >= 3.2 < 4.9.337 | 4.9.337 |
| linux | linux_kernel | >= 4.10 < 4.14.303 | 4.14.303 |
| linux | linux_kernel | >= 4.15 < 4.19.270 | 4.19.270 |
| linux | linux_kernel | >= 4.20 < 5.4.229 | 5.4.229 |
| linux | linux_kernel | >= 5.11 < 5.15.87 | 5.15.87 |
| linux | linux_kernel | >= 5.16 < 6.0.18 | 6.0.18 |
| linux | linux_kernel | >= 5.5 < 5.10.163 | 5.10.163 |
| linux | linux_kernel | >= 6.1 < 6.1.4 | 6.1.4 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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OSV
CVE-2022-50534: In the Linux kernel, the following vulnerability has been resolved: dm thin: Use last transaction's pmd->root when commit failed Recently we found a s
osv·2025-10-07·CVSS 5.5
CVE-2022-50534 [MEDIUM] CVE-2022-50534: In the Linux kernel, the following vulnerability has been resolved: dm thin: Use last transaction's pmd->root when commit failed Recently we found a s
In the Linux kernel, the following vulnerability has been resolved: dm thin: Use last transaction's pmd->root when commit failed Recently we found a softlock up problem in dm thin pool btree lookup code due to corrupted metadata: Kernel panic - not syncing: softlockup: hung tasks CPU: 7 PID: 2669225 Comm: kworker/u16:3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: dm-thin do_worker [dm_thin_pool] Call Trace: dump_stack+0x9c/0xd3 panic+0x35d/0x6b9 watchdog_timer_fn.cold+0x16/0x25 __run_hrtimer+0xa2/0x2d0 RIP: 0010:__relink_lru+0x102/0x220 [dm_bufio] __bufio_new+0x11f/0x4f0 [dm_bufio] new_read+0xa3/0x1e0 [dm_bufio] dm_bm_read_lock+0x33/0xd0 [dm_persistent_data] ro_step+0x63/0x100 [dm_persistent_data] btree_lookup_raw.constprop.0+0x44/0x220 [dm_persistent_data] dm_btree_loo
GHSA
GHSA-84fr-rw9r-j8p4: In the Linux kernel, the following vulnerability has been resolved:
dm thin: Use last transaction's pmd->root when commit failed
Recently we found a
ghsa_unreviewed·2025-10-07
CVE-2022-50534 [MEDIUM] GHSA-84fr-rw9r-j8p4: In the Linux kernel, the following vulnerability has been resolved:
dm thin: Use last transaction's pmd->root when commit failed
Recently we found a
In the Linux kernel, the following vulnerability has been resolved:
dm thin: Use last transaction's pmd->root when commit failed
Recently we found a softlock up problem in dm thin pool btree lookup
code due to corrupted metadata:
Kernel panic - not syncing: softlockup: hung tasks
CPU: 7 PID: 2669225 Comm: kworker/u16:3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Workqueue: dm-thin do_worker [dm_thin_pool]
Call Trace:
dump_stack+0x9c/0xd3
panic+0x35d/0x6b9
watchdog_timer_fn.cold+0x16/0x25
__run_hrtimer+0xa2/0x2d0
RIP: 0010:__relink_lru+0x102/0x220 [dm_bufio]
__bufio_new+0x11f/0x4f0 [dm_bufio]
new_read+0xa3/0x1e0 [dm_bufio]
dm_bm_read_lock+0x33/0xd0 [dm_persistent_data]
ro_step+0x63/0x100 [dm_persistent_data]
btree_lookup_raw.constprop.0+0x44/0x220 [dm_persistent_data]
dm_btre
Red Hat
kernel: dm thin: Use last transaction's pmd->root when commit failed
vendor_redhat·2025-10-07·CVSS 5.5
CVE-2022-50534 [MEDIUM] kernel: dm thin: Use last transaction's pmd->root when commit failed
kernel: dm thin: Use last transaction's pmd->root when commit failed
In the Linux kernel, the following vulnerability has been resolved:
dm thin: Use last transaction's pmd->root when commit failed
Recently we found a softlock up problem in dm thin pool btree lookup
code due to corrupted metadata:
Kernel panic - not syncing: softlockup: hung tasks
CPU: 7 PID: 2669225 Comm: kworker/u16:3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Workqueue: dm-thin do_worker [dm_thin_pool]
Call Trace:
dump_stack+0x9c/0xd3
panic+0x35d/0x6b9
watchdog_timer_fn.cold+0x16/0x25
__run_hrtimer+0xa2/0x2d0
RIP: 0010:__relink_lru+0x102/0x220 [dm_bufio]
__bufio_new+0x11f/0x4f0 [dm_bufio]
new_read+0xa3/0x1e0 [dm_bufio]
dm_bm_read_lock+0x33/0xd0 [dm_persistent_data]
ro_step+0x63/0x100 [dm_persistent_data]
b
Debian
CVE-2022-50534: linux - In the Linux kernel, the following vulnerability has been resolved: dm thin: Us...
vendor_debian·2022·CVSS 5.5
CVE-2022-50534 [MEDIUM] CVE-2022-50534: linux - In the Linux kernel, the following vulnerability has been resolved: dm thin: Us...
In the Linux kernel, the following vulnerability has been resolved: dm thin: Use last transaction's pmd->root when commit failed Recently we found a softlock up problem in dm thin pool btree lookup code due to corrupted metadata: Kernel panic - not syncing: softlockup: hung tasks CPU: 7 PID: 2669225 Comm: kworker/u16:3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: dm-thin do_worker [dm_thin_pool] Call Trace: dump_stack+0x9c/0xd3 panic+0x35d/0x6b9 watchdog_timer_fn.cold+0x16/0x25 __run_hrtimer+0xa2/0x2d0 RIP: 0010:__relink_lru+0x102/0x220 [dm_bufio] __bufio_new+0x11f/0x4f0 [dm_bufio] new_read+0xa3/0x1e0 [dm_bufio] dm_bm_read_lock+0x33/0xd0 [dm_persistent_data] ro_step+0x63/0x100 [dm_persistent_data] btree_lookup_raw.constprop.0+0x44/0x220 [dm_persistent_data] dm_btree_loo
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/3db757ffdd87ed8d7118b2250236a496502a660fhttps://git.kernel.org/stable/c/4b710e8481ade7c9200e94d3018e99dc42a0a0e8https://git.kernel.org/stable/c/7991dbff6849f67e823b7cc0c15e5a90b0549b9fhttps://git.kernel.org/stable/c/87d69b8824ca9b090f5a8ed47f758e8f6eecb871https://git.kernel.org/stable/c/94f01ecc2aa0be992865acc80ebb6701f731f955https://git.kernel.org/stable/c/a63ce4eca86fd207e3db07c00fb7ccf4adf1b230https://git.kernel.org/stable/c/b35a22760aa5008d82533e59b0f0b5eb1b02d4e5https://git.kernel.org/stable/c/b91f481300e3a10eaf66b94fc39b740928762aafhttps://git.kernel.org/stable/c/f758987ff0af3a4b5ee69e95cab6a5294e4367b0
2025-10-07
Published