CVE-2024-0775: Kernel: use-after-free while changing the mount option in __ext4_remount leading

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: 2024-01-22 · updated 2026-08-10
Weakness: CWE-416

Description

A use-after-free flaw was found in the __ext4_remount in fs/ext4/super.c in ext4 in the Linux kernel. This flaw allows a local user to cause an information leak problem while freeing the old quota file names before a potential failure, leading to a use-after-free.

Affected products

Linux kernel: before 6.4; 6.4-rc1 — fixed in 6.4
Red Hat Enterprise Linux: 9.0

How to fix

Upgrade to a fixed version: Linux kernel 6.4. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2024-0775
https://bugzilla.redhat.com/show_bug.cgi?id=2259414
https://scm.linefinity.com/common/linux-stable/commit/4c0b4818b1f636bc96359f7817a2d8bab6370162
https://access.redhat.com/security/cve/CVE-2024-0775
https://bugzilla.redhat.com/show_bug.cgi?id=2259414
https://scm.linefinity.com/common/linux-stable/commit/4c0b4818b1f636bc96359f7817a2d8bab6370162

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