Linux Kernel up to 5.4.1 fs/ext4/inode.c __ext4_expand_extra_isize/ext4_xattr_set_entry use after free

CVSS Meta Temp Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 5.4.1. Affected by this issue is the function __ext4_expand_extra_isize/ext4_xattr_set_entry of the file fs/ext4/inode.c. Executing a manipulation can lead to use after free. This vulnerability appears as CVE-2019-19767. The attack requires local access. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.4.1 (Operating System). It has been declared as critical. This vulnerability affects the function __ext4_expand_extra_isize/ext4_xattr_set_entry of the file fs/ext4/inode.c. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Linux kernel before 5.4.2 mishandles ext4_expand_extra_isize, as demonstrated by use-after-free errors in __ext4_expand_extra_isize and ext4_xattr_set_entry, related to fs/ext4/inode.c and fs/ext4/super.c, aka CID-4ea99936a163.

The weakness was presented 12/12/2019. This vulnerability was named CVE-2019-19767 since 12/12/2019. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 246866 (Linux Distros Unpatched Vulnerability : CVE-2019-19767), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (246866). See VDB-147151, VDB-147150 and VDB-147149 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 246866
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2019-19767

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.4.2
Patch: git.kernel.org

Timelineinfo

12/12/2019 🔍
12/12/2019 +0 days 🔍
12/13/2019 +1 days 🔍
08/10/2025 +2067 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 4ea99936a1630f51fc3a2d61a58ec4a1c4b7d55a
Status: Confirmed

CVE: CVE-2019-19767 (🔍)
GCVE (CVE): GCVE-0-2019-19767
GCVE (VulDB): GCVE-100-147148
See also: 🔍

Entryinfo

Created: 12/13/2019 09:08
Updated: 08/10/2025 18:30
Changes: 12/13/2019 09:08 (40), 12/13/2019 09:13 (18), 03/11/2024 14:38 (6), 03/11/2024 14:40 (1), 08/10/2025 18:30 (18)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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