CVE-2023-53380: md/raid10: fix null-ptr-deref of mreplace in raid10_sync_request

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: 2025-09-18 · updated 2026-06-17
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: md/raid10: fix null-ptr-deref of mreplace in raid10_sync_request There are two check of 'mreplace' in raid10_sync_request(). In the first check, 'need_replace' will be set and 'mreplace' will be used later if no-Faulty 'mreplace' exists, In the second check, 'mreplace' will be set to NULL if it is Faulty, but 'need_replace' will not be changed accordingly. null-ptr-deref occurs if Faulty is set between two check. Fix it by merging two checks into one. And replace 'need_replace' with 'mreplace' because their values are always the same.

Affected products

Linux kernel: from 4.20 before 5.4.251; from 5.5 before 5.10.188; from 5.11 before 5.15.121; from 5.16 before 6.1.39; from 6.2 before 6.3.13; from 6.4 before 6.4.4 — fixed in 5.10.188, 5.15.121, 5.4.251, 6.1.39, 6.3.13, 6.4.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.188, 5.15.121, 5.4.251, 6.1.39. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2023-53380 or the next vulnerability affects your stack