CVE-2024-26791: btrfs: dev-replace: properly validate device names

Severity: high (CVSS 7.1 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: 2024-04-04 · updated 2026-06-17
Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: dev-replace: properly validate device names There's a syzbot report that device name buffers passed to device replace are not properly checked for string termination which could lead to a read out of bounds in getname_kernel(). Add a helper that validates both source and target device name buffers. For devid as the source initialize the buffer to empty string in case something tries to read it later. This was originally analyzed and fixed in a different way by Edward Adam Davis (see links).

Affected products

Linux kernel: before 4.19.309; from 4.20 before 5.4.271; from 5.5 before 5.10.212; from 5.11 before 5.15.151; from 5.16 before 6.1.81; from 6.2 before 6.6.21 — fixed in 4.19.309, 5.10.212, 5.15.151, 5.4.271, 6.1.81, 6.6.21

How to fix

Upgrade to a fixed version: Linux kernel 4.19.309, 5.10.212, 5.15.151, 5.4.271. Check the vendor advisory for mitigations.

References

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