CVE-2025-40134 (GCVE-0-2025-40134)
Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-05-11 21:43
VLAI
EPSS
VEX
Title
dm: fix NULL pointer dereference in __dm_suspend()
Summary
In the Linux kernel, the following vulnerability has been resolved:
dm: fix NULL pointer dereference in __dm_suspend()
There is a race condition between dm device suspend and table load that
can lead to null pointer dereference. The issue occurs when suspend is
invoked before table load completes:
BUG: kernel NULL pointer dereference, address: 0000000000000054
Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 6 PID: 6798 Comm: dmsetup Not tainted 6.6.0-g7e52f5f0ca9b #62
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014
RIP: 0010:blk_mq_wait_quiesce_done+0x0/0x50
Call Trace:
<TASK>
blk_mq_quiesce_queue+0x2c/0x50
dm_stop_queue+0xd/0x20
__dm_suspend+0x130/0x330
dm_suspend+0x11a/0x180
dev_suspend+0x27e/0x560
ctl_ioctl+0x4cf/0x850
dm_ctl_ioctl+0xd/0x20
vfs_ioctl+0x1d/0x50
__se_sys_ioctl+0x9b/0xc0
__x64_sys_ioctl+0x19/0x30
x64_sys_call+0x2c4a/0x4620
do_syscall_64+0x9e/0x1b0
The issue can be triggered as below:
T1 T2
dm_suspend table_load
__dm_suspend dm_setup_md_queue
dm_mq_init_request_queue
blk_mq_init_allocated_queue
=> q->mq_ops = set->ops; (1)
dm_stop_queue / dm_wait_for_completion
=> q->tag_set NULL pointer! (2)
=> q->tag_set = set; (3)
Fix this by checking if a valid table (map) exists before performing
request-based suspend and waiting for target I/O. When map is NULL,
skip these table-dependent suspend steps.
Even when map is NULL, no I/O can reach any target because there is
no table loaded; I/O submitted in this state will fail early in the
DM layer. Skipping the table-dependent suspend logic in this case
is safe and avoids NULL pointer dereferences.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
c4576aed8d85d808cd6443bda58393d525207d01 , < 9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98
(git)
Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 30f95b7eda5966b81cb221bd569c0f095a068cf6 (git) Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c (git) Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < a802901b75e13cc306f1b7ab0f062135c8034e9e (git) Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe (git) Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 19ca4528666990be376ac3eb6fe667b03db5324d (git) Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 331c2dd8ca8bad1a3ac10cce847ffb76158eece4 (git) Affected: c4576aed8d85d808cd6443bda58393d525207d01 , < 8d33a030c566e1f105cd5bf27f37940b6367f3be (git) |
guessed | |
| Linux | Linux |
Affected:
5.0
Unaffected: 0 , < 5.0 (semver) Unaffected: 5.4.301 , ≤ 5.4.* (semver) Unaffected: 5.10.246 , ≤ 5.10.* (semver) Unaffected: 5.15.195 , ≤ 5.15.* (semver) Unaffected: 6.1.156 , ≤ 6.1.* (semver) Unaffected: 6.6.112 , ≤ 6.6.* (semver) Unaffected: 6.12.53 , ≤ 6.12.* (semver) Unaffected: 6.17.3 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
{
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"descriptions": [
{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix NULL pointer dereference in __dm_suspend()\n\nThere is a race condition between dm device suspend and table load that\ncan lead to null pointer dereference. The issue occurs when suspend is\ninvoked before table load completes:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000054\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 6 PID: 6798 Comm: dmsetup Not tainted 6.6.0-g7e52f5f0ca9b #62\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014\nRIP: 0010:blk_mq_wait_quiesce_done+0x0/0x50\nCall Trace:\n \u003cTASK\u003e\n blk_mq_quiesce_queue+0x2c/0x50\n dm_stop_queue+0xd/0x20\n __dm_suspend+0x130/0x330\n dm_suspend+0x11a/0x180\n dev_suspend+0x27e/0x560\n ctl_ioctl+0x4cf/0x850\n dm_ctl_ioctl+0xd/0x20\n vfs_ioctl+0x1d/0x50\n __se_sys_ioctl+0x9b/0xc0\n __x64_sys_ioctl+0x19/0x30\n x64_sys_call+0x2c4a/0x4620\n do_syscall_64+0x9e/0x1b0\n\nThe issue can be triggered as below:\n\nT1 \t\t\t\t\t\tT2\ndm_suspend\t\t\t\t\ttable_load\n__dm_suspend\t\t\t\t\tdm_setup_md_queue\n\t\t\t\t\t\tdm_mq_init_request_queue\n\t\t\t\t\t\tblk_mq_init_allocated_queue\n\t\t\t\t\t\t=\u003e q-\u003emq_ops = set-\u003eops; (1)\ndm_stop_queue / dm_wait_for_completion\n=\u003e q-\u003etag_set NULL pointer!\t(2)\n\t\t\t\t\t\t=\u003e q-\u003etag_set = set; (3)\n\nFix this by checking if a valid table (map) exists before performing\nrequest-based suspend and waiting for target I/O. When map is NULL,\nskip these table-dependent suspend steps.\n\nEven when map is NULL, no I/O can reach any target because there is\nno table loaded; I/O submitted in this state will fail early in the\nDM layer. Skipping the table-dependent suspend logic in this case\nis safe and avoids NULL pointer dereferences."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T21:43:24.586Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"references": [
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"url": "https://git.kernel.org/stable/c/9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98"
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{
"url": "https://git.kernel.org/stable/c/30f95b7eda5966b81cb221bd569c0f095a068cf6"
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{
"url": "https://git.kernel.org/stable/c/a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c"
},
{
"url": "https://git.kernel.org/stable/c/a802901b75e13cc306f1b7ab0f062135c8034e9e"
},
{
"url": "https://git.kernel.org/stable/c/846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe"
},
{
"url": "https://git.kernel.org/stable/c/19ca4528666990be376ac3eb6fe667b03db5324d"
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"url": "https://git.kernel.org/stable/c/331c2dd8ca8bad1a3ac10cce847ffb76158eece4"
},
{
"url": "https://git.kernel.org/stable/c/8d33a030c566e1f105cd5bf27f37940b6367f3be"
}
],
"title": "dm: fix NULL pointer dereference in __dm_suspend()",
"x_generator": {
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"cveId": "CVE-2025-40134",
"datePublished": "2025-11-12T10:23:22.771Z",
"dateReserved": "2025-04-16T07:20:57.170Z",
"dateUpdated": "2026-05-11T21:43:24.586Z",
"state": "PUBLISHED"
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix NULL pointer dereference in __dm_suspend()\n\nThere is a race condition between dm device suspend and table load that\ncan lead to null pointer dereference. The issue occurs when suspend is\ninvoked before table load completes:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000054\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 6 PID: 6798 Comm: dmsetup Not tainted 6.6.0-g7e52f5f0ca9b #62\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014\nRIP: 0010:blk_mq_wait_quiesce_done+0x0/0x50\nCall Trace:\n \u003cTASK\u003e\n blk_mq_quiesce_queue+0x2c/0x50\n dm_stop_queue+0xd/0x20\n __dm_suspend+0x130/0x330\n dm_suspend+0x11a/0x180\n dev_suspend+0x27e/0x560\n ctl_ioctl+0x4cf/0x850\n dm_ctl_ioctl+0xd/0x20\n vfs_ioctl+0x1d/0x50\n __se_sys_ioctl+0x9b/0xc0\n __x64_sys_ioctl+0x19/0x30\n x64_sys_call+0x2c4a/0x4620\n do_syscall_64+0x9e/0x1b0\n\nThe issue can be triggered as below:\n\nT1 \t\t\t\t\t\tT2\ndm_suspend\t\t\t\t\ttable_load\n__dm_suspend\t\t\t\t\tdm_setup_md_queue\n\t\t\t\t\t\tdm_mq_init_request_queue\n\t\t\t\t\t\tblk_mq_init_allocated_queue\n\t\t\t\t\t\t=\u003e q-\u003emq_ops = set-\u003eops; (1)\ndm_stop_queue / dm_wait_for_completion\n=\u003e q-\u003etag_set NULL pointer!\t(2)\n\t\t\t\t\t\t=\u003e q-\u003etag_set = set; (3)\n\nFix this by checking if a valid table (map) exists before performing\nrequest-based suspend and waiting for target I/O. When map is NULL,\nskip these table-dependent suspend steps.\n\nEven when map is NULL, no I/O can reach any target because there is\nno table loaded; I/O submitted in this state will fail early in the\nDM layer. Skipping the table-dependent suspend logic in this case\nis safe and avoids NULL pointer dereferences."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndm: corrige la desreferencia de puntero NULL en __dm_suspend()\n\nExiste una condici\u00f3n de carrera entre la suspensi\u00f3n del dispositivo dm y la carga de la tabla que puede llevar a una desreferencia de puntero nulo. El problema ocurre cuando la suspensi\u00f3n es invocada antes de que la carga de la tabla se complete:\n\nBUG: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000054\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 6 PID: 6798 Comm: dmsetup No contaminado 6.6.0-g7e52f5f0ca9b #62\nNombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014\nRIP: 0010:blk_mq_wait_quiesce_done+0x0/0x50\nTraza de llamada:\n \u003cTAREA\u003e\n blk_mq_quiesce_queue+0x2c/0x50\n dm_stop_queue+0xd/0x20\n __dm_suspend+0x130/0x330\n dm_suspend+0x11a/0x180\n dev_suspend+0x27e/0x560\n ctl_ioctl+0x4cf/0x850\n dm_ctl_ioctl+0xd/0x20\n vfs_ioctl+0x1d/0x50\n __se_sys_ioctl+0x9b/0xc0\n __x64_sys_ioctl+0x19/0x30\n x64_sys_call+0x2c4a/0x4620\n do_syscall_64+0x9e/0x1b0\n\nEl problema puede ser activado como se muestra a continuaci\u00f3n:\n\nT1 \t\t\t\t\t\tT2\ndm_suspend\t\t\t\t\ttable_load\n__dm_suspend\t\t\t\t\tdm_setup_md_queue\n\t\t\t\t\t\tdm_mq_init_request_queue\n\t\t\t\t\t\tblk_mq_init_allocated_queue\n\t\t\t\t\t\t=\u003e q-\u003emq_ops = set-\u003eops; (1)\ndm_stop_queue / dm_wait_for_completion\n=\u003e \u00a1puntero NULL q-\u003etag_set!\t(2)\n\t\t\t\t\t\t=\u003e q-\u003etag_set = set; (3)\n\nSoluciona esto comprobando si existe una tabla (mapa) v\u00e1lida antes de realizar la suspensi\u00f3n basada en solicitudes y esperar la E/S del objetivo. Cuando el mapa es NULL, omite estos pasos de suspensi\u00f3n dependientes de la tabla.\n\nIncluso cuando el mapa es NULL, ninguna E/S puede alcanzar ning\u00fan objetivo porque no hay ninguna tabla cargada; la E/S enviada en este estado fallar\u00e1 tempranamente en la capa DM. Omitir la l\u00f3gica de suspensi\u00f3n dependiente de la tabla en este caso es seguro y evita las desreferencias de puntero NULL."
}
],
"id": "CVE-2025-40134",
"lastModified": "2026-10-19T21:10:00.160",
"metrics": {},
"published": "2025-11-12T11:15:43.100",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/19ca4528666990be376ac3eb6fe667b03db5324d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/30f95b7eda5966b81cb221bd569c0f095a068cf6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/331c2dd8ca8bad1a3ac10cce847ffb76158eece4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8d33a030c566e1f105cd5bf27f37940b6367f3be"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a802901b75e13cc306f1b7ab0f062135c8034e9e"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T10:20:43+00:00",
"cve": "CVE-2025-40134",
"id": "CVE-2025-40134",
"initial_release_date": "2025-11-12T00:00:00+00:00",
"product_status:fixed": "612",
"product_status:known_affected": "112",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: dm: fix NULL pointer dereference in __dm_suspend()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40134.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.