Linux Kernel up to 6.5.5 nilfs2 nilfs_gccache_submit_read_data use after free

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.5.5. It has been classified as problematic. This affects the function nilfs_gccache_submit_read_data of the component nilfs2. This manipulation causes use after free. This vulnerability is registered as CVE-2023-52566. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.5.5 (Operating System) and classified as problematic. Affected by this vulnerability is the function nilfs_gccache_submit_read_data of the component nilfs2. 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. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data() In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the reference count of bh when the call to nilfs_dat_translate() fails. If the reference count hits 0 and its owner page gets unlocked, bh may be freed. However, bh->b_page is dereferenced to put the page after that, which may result in a use-after-free bug. This patch moves the release operation after unlocking and putting the page. NOTE: The function in question is only called in GC, and in combination with current userland tools, address translation using DAT does not occur in that function, so the code path that causes this issue will not be executed. However, it is possible to run that code path by intentionally modifying the userland GC library or by calling the GC ioctl directly. [[email protected]: NOTE added to the commit log]

The weakness was published 03/02/2024. The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2023-52566. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 271767 (Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.4-2025-112 (ALASKERNEL-5.4-2025-112)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.327, 4.19.296, 5.4.258, 5.10.198, 5.15.134, 6.1.56, 6.5.6 or 6.6 eliminates this vulnerability. Applying the patch fb1084e63ee5/bb61224f6abc/193b5a1c6c67/7130a87ca323/3936e8714907/980663f1d189/28df4646ad8b/7ee29facd8a9 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (271767). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 5.5
CNA Vector: 🔍

CVSSv2info

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

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 271767
Nessus Name: Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.4-2025-112 (ALASKERNEL-5.4-2025-112)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.14.327/4.19.296/5.4.258/5.10.198/5.15.134/6.1.56/6.5.6/6.6
Patch: fb1084e63ee5/bb61224f6abc/193b5a1c6c67/7130a87ca323/3936e8714907/980663f1d189/28df4646ad8b/7ee29facd8a9

Timelineinfo

03/02/2024 🔍
03/02/2024 +0 days 🔍
03/02/2024 +0 days 🔍
10/29/2025 +606 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-52566 (🔍)
GCVE (CVE): GCVE-0-2023-52566
GCVE (VulDB): GCVE-100-255505

Entryinfo

Created: 03/02/2024 23:26
Updated: 10/29/2025 04:25
Changes: 03/02/2024 23:26 (42), 04/04/2024 08:38 (15), 11/06/2024 17:31 (12), 10/29/2025 04:25 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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