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CVE-2024-49960

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ext4: fix timer use-after-free on failed mount Syzbot has found an ODEBUG bug in ext4_fill_super The del_timer_sync function c…

Published Oct 21, 2024CWE-416EPSS 0.29%

Overview

CVE-2024-49960 is a high-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ext4: fix timer use-after-free on failed mount

Syzbot has found an ODEBUG bug in ext4_fill_super

The del_timer_sync function cancels the s_err_report timer,

which reminds about filesystem errors daily. We should

guarantee the timer is no longer active before kfree(sbi).

When filesystem mounting fails, the flow goes to failed_mount3,

where an error occurs when ext4_stop_mmpd is called, causing

a read I/O failure. This triggers the ext4_handle_error function

that ultimately re-arms the timer,

leaving the s_err_report timer active before kfree(sbi) is called.

Fix the issue by canceling the s_err_report timer after calling ext4_stop_mmpd.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22aRefgit.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04Refgit.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076cRefgit.kernel.org/stable/c/9203817ba46ebba7c865c8de2aba399537b6e891Refgit.kernel.org/stable/c/b85569585d0154d4db1e4f9e3e6a4731d407feb0Refgit.kernel.org/stable/c/cf3196e5e2f36cd80dab91ffae402e13935724bcRefgit.kernel.org/stable/c/fa78fb51d396f4f2f80f8e96a3b1516f394258beReflists.debian.org/debian-lts-announce/2025/01/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/05/msg00030.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-49960?

CVE-2024-49960 is a high-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-49960?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-49960?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-49960?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-49960 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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