Answer in brief
CVE-2025-40134 records a Unknown severity vulnerability in dm: fix NULL pointer dereference in __dm_suspend(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c4576aed8d85d808cd6443bda58393d525207d01 <9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98 || >=c4576aed8d85d808cd6443bda58393d525207d01 <30f95b7eda5966b81cb221bd569c0f095a068cf6 || >=c4576aed8d85d808cd6443bda58393d525207d01 <a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c || >=c4576aed8d85d808cd6443bda58393d525207d01 <a802901b75e13cc306f1b7ab0f062135c8034e9e || >=c4576aed8d85d808cd6443bda58393d525207d01 <846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe || >=c4576aed8d85d808cd6443bda58393d525207d01 <19ca4528666990be376ac3eb6fe667b03db5324d || >=c4576aed8d85d808cd6443bda58393d525207d01 <331c2dd8ca8bad1a3ac10cce847ffb76158eece4 || >=c4576aed8d85d808cd6443bda58393d525207d01 <8d33a030c566e1f105cd5bf27f37940b6367f3be | 9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98, 30f95b7eda5966b81cb221bd569c0f095a068cf6, a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c, a802901b75e13cc306f1b7ab0f062135c8034e9e, 846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe, 19ca4528666990be376ac3eb6fe667b03db5324d, 331c2dd8ca8bad1a3ac10cce847ffb76158eece4, 8d33a030c566e1f105cd5bf27f37940b6367f3be |
| Linux/Linuxgeneric | 5.0 | Not reported |
Published upstream
Nov 12, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 28, 2026
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.
Quoted source text, attributed separately from HOL analysis.