What’s Vulnerable › Vulnerabilities

CVE-2021-47498: dm rq: don't queue request to blk-mq during DM suspend

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-22 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: dm rq: don't queue request to blk-mq during DM suspend DM uses blk-mq's quiesce/unquiesce to stop/start device mapper queue. But blk-mq's unquiesce may come from outside events, such as elevator switch, updating nr_requests or others, and request may come during suspend, so simply ask for blk-mq to requeue it. Fixes one kernel panic issue when running updating nr_requests and dm-mpath suspend/resume stress test.

Affected products

• Linux kernel: before 5.14.14; 5.15-rc1, 5.15-rc2, 5.15-rc3, 5.15-rc4, 5.15-rc5 — fixed in 5.14.14

How to fix

Upgrade to a fixed version: Linux kernel 5.14.14. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/8050652810bf38241edec8717393d2446e8036f1
• https://git.kernel.org/stable/c/8ca9745efe3528feb06ca4e117188038eea2d351
• https://git.kernel.org/stable/c/b4459b11e84092658fa195a2587aff3b9637f0e7
• https://git.kernel.org/stable/c/8ca9745efe3528feb06ca4e117188038eea2d351
• https://git.kernel.org/stable/c/b4459b11e84092658fa195a2587aff3b9637f0e7
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

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