CVE-2022-50381 (GCVE-0-2022-50381)
Vulnerability from cvelistv5 – Published: 2025-09-18 13:33 – Updated: 2026-05-11 19:18
VLAI
EPSS
VEX
Title
md: fix a crash in mempool_free
Summary
In the Linux kernel, the following vulnerability has been resolved:
md: fix a crash in mempool_free
There's a crash in mempool_free when running the lvm test
shell/lvchange-rebuild-raid.sh.
The reason for the crash is this:
* super_written calls atomic_dec_and_test(&mddev->pending_writes) and
wake_up(&mddev->sb_wait). Then it calls rdev_dec_pending(rdev, mddev)
and bio_put(bio).
* so, the process that waited on sb_wait and that is woken up is racing
with bio_put(bio).
* if the process wins the race, it calls bioset_exit before bio_put(bio)
is executed.
* bio_put(bio) attempts to free a bio into a destroyed bio set - causing
a crash in mempool_free.
We fix this bug by moving bio_put before atomic_dec_and_test.
We also move rdev_dec_pending before atomic_dec_and_test as suggested by
Neil Brown.
The function md_end_flush has a similar bug - we must call bio_put before
we decrement the number of in-progress bios.
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 11557f0067 P4D 11557f0067 PUD 0
Oops: 0002 [#1] PREEMPT SMP
CPU: 0 PID: 73 Comm: kworker/0:1 Not tainted 6.1.0-rc3 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
Workqueue: kdelayd flush_expired_bios [dm_delay]
RIP: 0010:mempool_free+0x47/0x80
Code: 48 89 ef 5b 5d ff e0 f3 c3 48 89 f7 e8 32 45 3f 00 48 63 53 08 48 89 c6 3b 53 04 7d 2d 48 8b 43 10 8d 4a 01 48 89 df 89 4b 08 <48> 89 2c d0 e8 b0 45 3f 00 48 8d 7b 30 5b 5d 31 c9 ba 01 00 00 00
RSP: 0018:ffff88910036bda8 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff8891037b65d8 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000202 RDI: ffff8891037b65d8
RBP: ffff8891447ba240 R08: 0000000000012908 R09: 00000000003d0900
R10: 0000000000000000 R11: 0000000000173544 R12: ffff889101a14000
R13: ffff8891562ac300 R14: ffff889102b41440 R15: ffffe8ffffa00d05
FS: 0000000000000000(0000) GS:ffff88942fa00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000001102e99000 CR4: 00000000000006b0
Call Trace:
<TASK>
clone_endio+0xf4/0x1c0 [dm_mod]
clone_endio+0xf4/0x1c0 [dm_mod]
__submit_bio+0x76/0x120
submit_bio_noacct_nocheck+0xb6/0x2a0
flush_expired_bios+0x28/0x2f [dm_delay]
process_one_work+0x1b4/0x300
worker_thread+0x45/0x3e0
? rescuer_thread+0x380/0x380
kthread+0xc2/0x100
? kthread_complete_and_exit+0x20/0x20
ret_from_fork+0x1f/0x30
</TASK>
Modules linked in: brd dm_delay dm_raid dm_mod af_packet uvesafb cfbfillrect cfbimgblt cn cfbcopyarea fb font fbdev tun autofs4 binfmt_misc configfs ipv6 virtio_rng virtio_balloon rng_core virtio_net pcspkr net_failover failover qemu_fw_cfg button mousedev raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 md_mod sd_mod t10_pi crc64_rocksoft crc64 virtio_scsi scsi_mod evdev psmouse bsg scsi_common [last unloaded: brd]
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:47 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f8b58edf3acf0dcc186b8330939000ecf709368a , < 732cd66ec19a17f2b9183d7d5b7bdb9c39b0776e
(git)
Affected: f8b58edf3acf0dcc186b8330939000ecf709368a , < cf06b162f5b6337b688072a1a47941280b8f7110 (git) Affected: f8b58edf3acf0dcc186b8330939000ecf709368a , < b5be563b4356b3089b3245d024cae3f248ba7090 (git) Affected: f8b58edf3acf0dcc186b8330939000ecf709368a , < 384ef33d37cefb2ac539d44597d03f06c9b8975c (git) Affected: f8b58edf3acf0dcc186b8330939000ecf709368a , < ae7793027766491c5f8635b12d15a5940d3b8698 (git) Affected: f8b58edf3acf0dcc186b8330939000ecf709368a , < 91bd504128a51776472445070e11a3b0f9348c90 (git) Affected: f8b58edf3acf0dcc186b8330939000ecf709368a , < 842f222fc42a9239831e15b1fd49a51c546902cb (git) Affected: f8b58edf3acf0dcc186b8330939000ecf709368a , < 97ce99984be12b9acb49ddce0f5d8ebb037adbb6 (git) Affected: f8b58edf3acf0dcc186b8330939000ecf709368a , < 341097ee53573e06ab9fc675d96a052385b851fa (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.13
Unaffected: 0 , < 2.6.13 (semver) Unaffected: 4.9.337 , ≤ 4.9.* (semver) Unaffected: 4.14.303 , ≤ 4.14.* (semver) Unaffected: 4.19.270 , ≤ 4.19.* (semver) Unaffected: 5.4.229 , ≤ 5.4.* (semver) Unaffected: 5.10.163 , ≤ 5.10.* (semver) Unaffected: 5.15.87 , ≤ 5.15.* (semver) Unaffected: 6.0.17 , ≤ 6.0.* (semver) Unaffected: 6.1.3 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix a crash in mempool_free\n\nThere\u0027s a crash in mempool_free when running the lvm test\nshell/lvchange-rebuild-raid.sh.\n\nThe reason for the crash is this:\n* super_written calls atomic_dec_and_test(\u0026mddev-\u003epending_writes) and\n wake_up(\u0026mddev-\u003esb_wait). Then it calls rdev_dec_pending(rdev, mddev)\n and bio_put(bio).\n* so, the process that waited on sb_wait and that is woken up is racing\n with bio_put(bio).\n* if the process wins the race, it calls bioset_exit before bio_put(bio)\n is executed.\n* bio_put(bio) attempts to free a bio into a destroyed bio set - causing\n a crash in mempool_free.\n\nWe fix this bug by moving bio_put before atomic_dec_and_test.\n\nWe also move rdev_dec_pending before atomic_dec_and_test as suggested by\nNeil Brown.\n\nThe function md_end_flush has a similar bug - we must call bio_put before\nwe decrement the number of in-progress bios.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 11557f0067 P4D 11557f0067 PUD 0\n Oops: 0002 [#1] PREEMPT SMP\n CPU: 0 PID: 73 Comm: kworker/0:1 Not tainted 6.1.0-rc3 #5\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014\n Workqueue: kdelayd flush_expired_bios [dm_delay]\n RIP: 0010:mempool_free+0x47/0x80\n Code: 48 89 ef 5b 5d ff e0 f3 c3 48 89 f7 e8 32 45 3f 00 48 63 53 08 48 89 c6 3b 53 04 7d 2d 48 8b 43 10 8d 4a 01 48 89 df 89 4b 08 \u003c48\u003e 89 2c d0 e8 b0 45 3f 00 48 8d 7b 30 5b 5d 31 c9 ba 01 00 00 00\n RSP: 0018:ffff88910036bda8 EFLAGS: 00010093\n RAX: 0000000000000000 RBX: ffff8891037b65d8 RCX: 0000000000000001\n RDX: 0000000000000000 RSI: 0000000000000202 RDI: ffff8891037b65d8\n RBP: ffff8891447ba240 R08: 0000000000012908 R09: 00000000003d0900\n R10: 0000000000000000 R11: 0000000000173544 R12: ffff889101a14000\n R13: ffff8891562ac300 R14: ffff889102b41440 R15: ffffe8ffffa00d05\n FS: 0000000000000000(0000) GS:ffff88942fa00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 0000001102e99000 CR4: 00000000000006b0\n Call Trace:\n \u003cTASK\u003e\n clone_endio+0xf4/0x1c0 [dm_mod]\n clone_endio+0xf4/0x1c0 [dm_mod]\n __submit_bio+0x76/0x120\n submit_bio_noacct_nocheck+0xb6/0x2a0\n flush_expired_bios+0x28/0x2f [dm_delay]\n process_one_work+0x1b4/0x300\n worker_thread+0x45/0x3e0\n ? rescuer_thread+0x380/0x380\n kthread+0xc2/0x100\n ? kthread_complete_and_exit+0x20/0x20\n ret_from_fork+0x1f/0x30\n \u003c/TASK\u003e\n Modules linked in: brd dm_delay dm_raid dm_mod af_packet uvesafb cfbfillrect cfbimgblt cn cfbcopyarea fb font fbdev tun autofs4 binfmt_misc configfs ipv6 virtio_rng virtio_balloon rng_core virtio_net pcspkr net_failover failover qemu_fw_cfg button mousedev raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 md_mod sd_mod t10_pi crc64_rocksoft crc64 virtio_scsi scsi_mod evdev psmouse bsg scsi_common [last unloaded: brd]\n CR2: 0000000000000000\n ---[ end trace 0000000000000000 ]---"
}
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"title": "md: fix a crash in mempool_free",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix a crash in mempool_free\n\nThere\u0027s a crash in mempool_free when running the lvm test\nshell/lvchange-rebuild-raid.sh.\n\nThe reason for the crash is this:\n* super_written calls atomic_dec_and_test(\u0026mddev-\u003epending_writes) and\n wake_up(\u0026mddev-\u003esb_wait). Then it calls rdev_dec_pending(rdev, mddev)\n and bio_put(bio).\n* so, the process that waited on sb_wait and that is woken up is racing\n with bio_put(bio).\n* if the process wins the race, it calls bioset_exit before bio_put(bio)\n is executed.\n* bio_put(bio) attempts to free a bio into a destroyed bio set - causing\n a crash in mempool_free.\n\nWe fix this bug by moving bio_put before atomic_dec_and_test.\n\nWe also move rdev_dec_pending before atomic_dec_and_test as suggested by\nNeil Brown.\n\nThe function md_end_flush has a similar bug - we must call bio_put before\nwe decrement the number of in-progress bios.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 11557f0067 P4D 11557f0067 PUD 0\n Oops: 0002 [#1] PREEMPT SMP\n CPU: 0 PID: 73 Comm: kworker/0:1 Not tainted 6.1.0-rc3 #5\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014\n Workqueue: kdelayd flush_expired_bios [dm_delay]\n RIP: 0010:mempool_free+0x47/0x80\n Code: 48 89 ef 5b 5d ff e0 f3 c3 48 89 f7 e8 32 45 3f 00 48 63 53 08 48 89 c6 3b 53 04 7d 2d 48 8b 43 10 8d 4a 01 48 89 df 89 4b 08 \u003c48\u003e 89 2c d0 e8 b0 45 3f 00 48 8d 7b 30 5b 5d 31 c9 ba 01 00 00 00\n RSP: 0018:ffff88910036bda8 EFLAGS: 00010093\n RAX: 0000000000000000 RBX: ffff8891037b65d8 RCX: 0000000000000001\n RDX: 0000000000000000 RSI: 0000000000000202 RDI: ffff8891037b65d8\n RBP: ffff8891447ba240 R08: 0000000000012908 R09: 00000000003d0900\n R10: 0000000000000000 R11: 0000000000173544 R12: ffff889101a14000\n R13: ffff8891562ac300 R14: ffff889102b41440 R15: ffffe8ffffa00d05\n FS: 0000000000000000(0000) GS:ffff88942fa00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 0000001102e99000 CR4: 00000000000006b0\n Call Trace:\n \u003cTASK\u003e\n clone_endio+0xf4/0x1c0 [dm_mod]\n clone_endio+0xf4/0x1c0 [dm_mod]\n __submit_bio+0x76/0x120\n submit_bio_noacct_nocheck+0xb6/0x2a0\n flush_expired_bios+0x28/0x2f [dm_delay]\n process_one_work+0x1b4/0x300\n worker_thread+0x45/0x3e0\n ? rescuer_thread+0x380/0x380\n kthread+0xc2/0x100\n ? kthread_complete_and_exit+0x20/0x20\n ret_from_fork+0x1f/0x30\n \u003c/TASK\u003e\n Modules linked in: brd dm_delay dm_raid dm_mod af_packet uvesafb cfbfillrect cfbimgblt cn cfbcopyarea fb font fbdev tun autofs4 binfmt_misc configfs ipv6 virtio_rng virtio_balloon rng_core virtio_net pcspkr net_failover failover qemu_fw_cfg button mousedev raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 md_mod sd_mod t10_pi crc64_rocksoft crc64 virtio_scsi scsi_mod evdev psmouse bsg scsi_common [last unloaded: brd]\n CR2: 0000000000000000\n ---[ end trace 0000000000000000 ]---"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T19:18:26.291Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/732cd66ec19a17f2b9183d7d5b7bdb9c39b0776e"
},
{
"url": "https://git.kernel.org/stable/c/cf06b162f5b6337b688072a1a47941280b8f7110"
},
{
"url": "https://git.kernel.org/stable/c/b5be563b4356b3089b3245d024cae3f248ba7090"
},
{
"url": "https://git.kernel.org/stable/c/384ef33d37cefb2ac539d44597d03f06c9b8975c"
},
{
"url": "https://git.kernel.org/stable/c/ae7793027766491c5f8635b12d15a5940d3b8698"
},
{
"url": "https://git.kernel.org/stable/c/91bd504128a51776472445070e11a3b0f9348c90"
},
{
"url": "https://git.kernel.org/stable/c/842f222fc42a9239831e15b1fd49a51c546902cb"
},
{
"url": "https://git.kernel.org/stable/c/97ce99984be12b9acb49ddce0f5d8ebb037adbb6"
},
{
"url": "https://git.kernel.org/stable/c/341097ee53573e06ab9fc675d96a052385b851fa"
}
],
"title": "md: fix a crash in mempool_free",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-50381",
"datePublished": "2025-09-18T13:33:03.439Z",
"dateReserved": "2025-09-17T14:53:06.996Z",
"dateUpdated": "2026-05-11T19:18:26.291Z",
"state": "PUBLISHED"
},
"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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