CVE-2024-50087: btrfs: fix uninitialized pointer free on read_alloc_one_name() error

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: 2024-10-29 · updated 2026-08-04
Weakness: CWE-824

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix uninitialized pointer free on read_alloc_one_name() error The function read_alloc_one_name() does not initialize the name field of the passed fscrypt_str struct if kmalloc fails to allocate the corresponding buffer. Thus, it is not guaranteed that fscrypt_str.name is initialized when freeing it. This is a follow-up to the linked patch that fixes the remaining instances of the bug introduced by commit e43eec81c516 ("btrfs: use struct qstr instead of name and namelen pairs").

Affected products

Linux kernel: from 6.1.57 before 6.1.114; from 6.2 before 6.6.58; from 6.7 before 6.11.5; 6.12-rc1, 6.12-rc2, 6.12-rc3 — fixed in 6.1.114, 6.11.5, 6.6.58

How to fix

Upgrade to a fixed version: Linux kernel 6.1.114, 6.11.5, 6.6.58. Check the vendor advisory for mitigations.

References

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