What is CVE-2023-52566?

CVE-2023-52566 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 2.6.30 onward and patched in 4.14.327, 4.19.296, 5.4.258 and others. CVE-2023-52566 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-52566?

CVE-2023-52566 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2023-52566?

Yes, CVE-2023-52566 has been patched. Fixed versions include 4.14.327, 4.19.296, 5.4.258 and others. If you are running Linux kernel 2.6.30 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-52566 actively exploited?

CVE-2023-52566 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2023-52566

Medium

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]

Package Linux Kernel

Published 2024-03-02

Last modified 2025-04-08

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-416

CVE-2023-52566 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.30 and later are affected. Fixed in 4.14.327, 4.19.296, 5.4.258, 5.10.198, 5.15.134, 6.1.56, 6.5.6, 6.6 and their respective stable series.

Affected from

≥ 2.6.30

Fixed in

✓ 4.14.327 4.14.x ✓ 4.19.296 4.19.x ✓ 5.4.258 5.4.x ✓ 5.10.198 5.10.x ✓ 5.15.134 5.15.x ✓ 6.1.56 6.1.x ✓ 6.5.6 6.5.x ✓ 6.6

References

8 total

Kernel Git
https://git.kernel.org/stable/c/193b5a1c6c67c36b430989dc063fe7ea4e200a33

Patch
Kernel Git
https://git.kernel.org/stable/c/28df4646ad8b433340772edc90ca709cdefc53e2

Patch
Kernel Git
https://git.kernel.org/stable/c/3936e8714907cd55e37c7cc50e50229e4a9042e8

Patch
Kernel Git
https://git.kernel.org/stable/c/7130a87ca32396eb9bf48b71a2d42259ae44c6c7

Patch
Kernel Git
https://git.kernel.org/stable/c/7ee29facd8a9c5a26079148e36bcf07141b3a6bc

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2023-52566

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-03-02

Modified 2025-04-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-52566?

CVE-2023-52566 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 2.6.30 onward and has been patched in 4.14.327, 4.19.296, 5.4.258 and others. CVE-2023-52566 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-52566?

CVE-2023-52566 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2023-52566?

Yes. CVE-2023-52566 has been patched. Fixed versions include 4.14.327, 4.19.296, 5.4.258 and others. If you are running Linux kernel 2.6.30 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-52566 actively exploited?

No. CVE-2023-52566 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.