What’s Vulnerable › Vulnerabilities

CVE-2023-53292: blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-16 · updated 2026-10-15
• Weakness: CWE-476

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.

Affected products

• Linux kernel: before 6.4.7 — fixed in 6.4.7

How to fix

Upgrade to a fixed version: Linux kernel 6.4.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/245165658e1c9f95c0fecfe02b9b1ebd30a1198a
• https://git.kernel.org/stable/c/3e977386521b71471e66ec2ba82efdfcc456adf2
• https://git.kernel.org/stable/c/988ddb77218d3975dd13dee7bb0e1fae098a9fdb
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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