dm: fix NULL pointer dereference in __dm_suspend()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-40134
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-12 11:15:43 UTC
Updated2026-10-19 21:10:00 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002270000 probability, percentile 0.125830000 (date 2026-10-19)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c4576aed8d85d808cd6443bda58393d525207d01 9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98 git Not specified
CNA Linux Linux affected c4576aed8d85d808cd6443bda58393d525207d01 30f95b7eda5966b81cb221bd569c0f095a068cf6 git Not specified
CNA Linux Linux affected c4576aed8d85d808cd6443bda58393d525207d01 a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c git Not specified
CNA Linux Linux affected c4576aed8d85d808cd6443bda58393d525207d01 a802901b75e13cc306f1b7ab0f062135c8034e9e git Not specified
CNA Linux Linux affected c4576aed8d85d808cd6443bda58393d525207d01 846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe git Not specified
CNA Linux Linux affected c4576aed8d85d808cd6443bda58393d525207d01 19ca4528666990be376ac3eb6fe667b03db5324d git Not specified
CNA Linux Linux affected c4576aed8d85d808cd6443bda58393d525207d01 331c2dd8ca8bad1a3ac10cce847ffb76158eece4 git Not specified
CNA Linux Linux affected c4576aed8d85d808cd6443bda58393d525207d01 8d33a030c566e1f105cd5bf27f37940b6367f3be git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 5.4.301 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.246 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.195 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.156 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.112 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.53 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.3 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d33a030c566e1f105cd5bf27f37940b6367f3be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/19ca4528666990be376ac3eb6fe667b03db5324d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a802901b75e13cc306f1b7ab0f062135c8034e9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/30f95b7eda5966b81cb221bd569c0f095a068cf6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/331c2dd8ca8bad1a3ac10cce847ffb76158eece4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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