In the Linux kernel, the following vulnerability has been resolved: ext4: avoid use-after-free in ext4_ext_show_leaf() In ext4_find_extent(), path may be freed by error or be reallocated, so using a previously saved *ppath may have been freed and thus may trigger use-after-free, as follows: ext4_split_extent path = *ppath; ext4_split_extent_at(ppath) path = ext4_find_extent(ppath) ext4_split_extent_at(ppath) // ext4_find_extent fails to free path // but zeroout succeeds ext4_ext_show_leaf(inode, path) eh = path[depth].p_hdr // path use-after-free !!! Similar to ext4_split_extent_at(), we use *ppath directly as an input to ext4_ext_show_leaf(). Fix a spelling error by the way. Same problem in ext4_ext_handle_unwritten_extents(). Since 'path' is only used in ext4_ext_show_leaf(), remove 'path' and use *ppath directly. This issue is triggered only when EXT_DEBUG is defined and therefore does not affect functionality.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel
Redhat
  • Enterprise Linux

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Package CPE Advisory Released Date
Red Hat Enterprise Linux 9
kernel-0:5.14.0-570.12.1.el9_6 cpe:/a:redhat:enterprise_linux:9 RHSA-2025:6966 2025-05-13T00:00:00Z
kernel-0:5.14.0-570.12.1.el9_6 cpe:/o:redhat:enterprise_linux:9 RHSA-2025:6966 2025-05-13T00:00:00Z
References
Link Providers
https://git.kernel.org/stable/c/2eba3b0cc5b8de624918d21f32b5b8db59a90b39 cve-icon cve-icon
https://git.kernel.org/stable/c/34b2096380ba475771971a778a478661a791aa15 cve-icon cve-icon
https://git.kernel.org/stable/c/4999fed877bb64e3e7f9ab9996de2ca983c41928 cve-icon cve-icon
https://git.kernel.org/stable/c/4e2524ba2ca5f54bdbb9e5153bea00421ef653f5 cve-icon cve-icon
https://git.kernel.org/stable/c/8b114f2cc7dd5d36729d040b68432fbd0f0a8868 cve-icon cve-icon
https://git.kernel.org/stable/c/b0cb4561fc4284d04e69c8a66c8504928ab2484e cve-icon cve-icon
https://git.kernel.org/stable/c/d483c7cc1796bd6a80e7b3a8fd494996260f6b67 cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html cve-icon
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html cve-icon
https://lore.kernel.org/linux-cve-announce/2024102117-CVE-2024-49889-6140@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2024-49889 cve-icon
https://www.cve.org/CVERecord?id=CVE-2024-49889 cve-icon
History

Mon, 03 Nov 2025 23:30:00 +0000

Type Values Removed Values Added
References

Mon, 03 Nov 2025 21:30:00 +0000

Type Values Removed Values Added
References

Wed, 14 May 2025 02:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux

Fri, 25 Oct 2024 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Weaknesses CWE-416
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Wed, 23 Oct 2024 01:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Tue, 22 Oct 2024 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 21 Oct 2024 18:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ext4: avoid use-after-free in ext4_ext_show_leaf() In ext4_find_extent(), path may be freed by error or be reallocated, so using a previously saved *ppath may have been freed and thus may trigger use-after-free, as follows: ext4_split_extent path = *ppath; ext4_split_extent_at(ppath) path = ext4_find_extent(ppath) ext4_split_extent_at(ppath) // ext4_find_extent fails to free path // but zeroout succeeds ext4_ext_show_leaf(inode, path) eh = path[depth].p_hdr // path use-after-free !!! Similar to ext4_split_extent_at(), we use *ppath directly as an input to ext4_ext_show_leaf(). Fix a spelling error by the way. Same problem in ext4_ext_handle_unwritten_extents(). Since 'path' is only used in ext4_ext_show_leaf(), remove 'path' and use *ppath directly. This issue is triggered only when EXT_DEBUG is defined and therefore does not affect functionality.
Title ext4: avoid use-after-free in ext4_ext_show_leaf()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-10-21T18:01:24.941Z

Updated: 2025-11-03T22:22:53.988Z

Reserved: 2024-10-21T12:17:06.022Z

Link: CVE-2024-49889

cve-icon Vulnrichment

Updated: 2025-11-03T22:22:53.988Z

cve-icon NVD

Status : Modified

Published: 2024-10-21T18:15:11.513

Modified: 2025-11-03T23:16:29.053

Link: CVE-2024-49889

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-10-21T00:00:00Z

Links: CVE-2024-49889 - Bugzilla