CVE-2024-41077: null_blk: fix validation of block size

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: 2024-07-29 · updated 2026-06-17
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: null_blk: fix validation of block size Block size should be between 512 and PAGE_SIZE and be a power of 2. The current check does not validate this, so update the check. Without this patch, null_blk would Oops due to a null pointer deref when loaded with bs=1536 [1]. [axboe: remove unnecessary braces and != 0 check]

Affected products

Linux kernel: before 5.10.223; from 5.11 before 5.15.164; from 5.16 before 6.1.101; from 6.2 before 6.6.42; from 6.7 before 6.9.11; 6.10-rc1, 6.10-rc2 — fixed in 5.10.223, 5.15.164, 6.1.101, 6.6.42, 6.9.11

How to fix

Upgrade to a fixed version: Linux kernel 5.10.223, 5.15.164, 6.1.101, 6.6.42. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-41077 or the next vulnerability affects your stack