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CVE-2025-40134· NVD / CVE Program· CNA Linux

dm: fix NULL pointer dereference in __dm_suspend()

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.

—No exploit Fix available
Published
Nov 12, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 10th percentile
CWE
—
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Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.0affected
    • c4576aed8d85d808cd6443bda58393d525207d01 and later · before 9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98affected · git
    • c4576aed8d85d808cd6443bda58393d525207d01 and later · before 30f95b7eda5966b81cb221bd569c0f095a068cf6affected · git
    • c4576aed8d85d808cd6443bda58393d525207d01 and later · before a0e54bd8d7ea79127fe9920df3ae36f85e79ac7caffected · git
    • c4576aed8d85d808cd6443bda58393d525207d01 and later · before a802901b75e13cc306f1b7ab0f062135c8034e9eaffected · git
    • c4576aed8d85d808cd6443bda58393d525207d01 and later · before 846cafc4725ca727d94f9c4b5f789c1a7c8fb6feaffected · git
    • c4576aed8d85d808cd6443bda58393d525207d01 and later · before 19ca4528666990be376ac3eb6fe667b03db5324daffected · git
    • c4576aed8d85d808cd6443bda58393d525207d01 and later · before 331c2dd8ca8bad1a3ac10cce847ffb76158eece4affected · git
    • c4576aed8d85d808cd6443bda58393d525207d01 and later · before 8d33a030c566e1f105cd5bf27f37940b6367f3beaffected · git
    • before 5.0not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.7.1.el10_26.12.0-211.7.1.el10_2

+96

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux19ca4528666990be376ac3eb6fe667b03db5324dVendor (CNA)
Linux Linux30f95b7eda5966b81cb221bd569c0f095a068cf6Vendor (CNA)
Linux Linux331c2dd8ca8bad1a3ac10cce847ffb76158eece4Vendor (CNA)
Linux Linux846cafc4725ca727d94f9c4b5f789c1a7c8fb6feVendor (CNA)
Linux Linux8d33a030c566e1f105cd5bf27f37940b6367f3beVendor (CNA)
Linux Linux9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98Vendor (CNA)
Linux Linuxa0e54bd8d7ea79127fe9920df3ae36f85e79ac7cVendor (CNA)
Linux Linuxa802901b75e13cc306f1b7ab0f062135c8034e9eVendor (CNA)
almalinux:kernel6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.7.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.158-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.7.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+3

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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