What is CVE-2023-53391?

CVE-2023-53391 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 2.6.30 onward and patched in 5.10.188, 5.15.121, 6.1.39 and others. CVE-2023-53391 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-53391?

CVE-2023-53391 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-2023-53391?

Yes, CVE-2023-53391 has been patched. Fixed versions include 5.10.188, 5.15.121, 6.1.39 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-2023-53391 actively exploited?

CVE-2023-53391 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-53391

Medium

In the Linux kernel, the following vulnerability has been resolved: shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs As the ramfs-based tmpfs uses ramfs_init_fs_context() for the init_fs_context method, which allocates fc->s_fs_info, use ramfs_kill_sb() to free it and avoid a memory leak.

Package Linux Kernel

Published 2025-09-18

Last modified 2026-01-14

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

Affected versions

Linux kernel versions 2.6.30 and later are affected. Fixed in 5.10.188, 5.15.121, 6.1.39, 6.4.4, 6.5 and their respective stable series.

Affected from

≥ 2.6.30

Fixed in

✓ 5.10.188 5.10.x ✓ 5.15.121 5.15.x ✓ 6.1.39 6.1.x ✓ 6.4.4 6.4.x ✓ 6.5

References

The following references provide additional information about CVE-2023-53391 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/1f34bf8b442c6d720e7fa6f15e8702427e48aea9
Patch
Kernel patch commit
https://git.kernel.org/stable/c/36ce9d76b0a93bae799e27e4f5ac35478c676592
Patch
Kernel patch commit
https://git.kernel.org/stable/c/487f229efea80c00dd7397547ec4f25fb8999d99
Patch

5 patch commits total View all on NVD

Details

CVE ID CVE-2023-53391

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-09-18

Modified 2026-01-14

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2023-53391?

CVE-2023-53391 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 2.6.30 onward and has been patched in 5.10.188, 5.15.121, 6.1.39 and others. CVE-2023-53391 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2023-53391?

CVE-2023-53391 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-2023-53391?

Yes — CVE-2023-53391 has been patched. Fixed versions include 5.10.188, 5.15.121, 6.1.39 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-2023-53391 actively exploited?

No — CVE-2023-53391 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.