PT-2024-7600 · Linux+8 · Linux Kernel+8
Baokun Li
·
Published
2024-09-03
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Updated
2025-09-29
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CVE-2024-49983
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.6.58
Description
The issue is related to the function
ext4 ext replay update ex() in the Linux kernel's ext4 file system module. It involves a double-free vulnerability, where previously freed memory is accessed again, potentially leading to confidentiality, integrity, and availability impacts. The vulnerability occurs when ext4 force split extent at() is called within ext4 ext replay update ex(), updating ppath but freeing path, which can trigger a double-free. The fix involves dropping the unnecessary ppath and using path directly, as well as using ext4 find extent() to update path and propagate its error return.Recommendations
For Linux kernel versions prior to 6.6.58, update to version 6.6.58 or later to resolve the issue. As a temporary workaround, consider restricting access to the vulnerable
ext4 ext replay update ex() function until a patch is available. Additionally, avoid using the ppath variable in the affected code path to minimize the risk of exploitation.Exploit
Fix
Double Free
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Hat
Red Os
Suse
Ubuntu