What is CVE-2026-45915?

CVE-2026-45915 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 2.6.19 onward and patched in 5.10.252, 5.15.202, 6.1.165 and others. CVE-2026-45915 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45915?

CVE-2026-45915 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-2026-45915?

Yes, CVE-2026-45915 has been patched. Fixed versions include 5.10.252, 5.15.202, 6.1.165 and others. If you are running Linux kernel 2.6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45915 actively exploited?

CVE-2026-45915 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-45915

Medium

In the Linux kernel, the following vulnerability has been resolved: fat: avoid parent link count underflow in rmdir Corrupted FAT images can leave a directory inode with an incorrect i_nlink (e.g. 2 even though subdirectories exist). rmdir then unconditionally calls drop_nlink(dir) and can drive i_nlink to 0, triggering the WARN_ON in drop_nlink(). Add a sanity check in vfat_rmdir() and msdos_rmdir(): only drop the parent link count when it is at least 3, otherwise report a filesystem error.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-06-24

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 2.6.19 and later are affected. Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0 and their respective stable series.

Affected from

≥ 2.6.19

Fixed in

✓ 5.10.252 5.10.x ✓ 5.15.202 5.15.x ✓ 6.1.165 6.1.x ✓ 6.6.128 6.6.x ✓ 6.12.75 6.12.x ✓ 6.18.14 6.18.x ✓ 6.19.4 6.19.x ✓ 7.0

References

8 total

Kernel Git
https://git.kernel.org/stable/c/17866f8a0822d414cb02e621cf003a7d04396ef8

Patch
Kernel Git
https://git.kernel.org/stable/c/7fe0de287e931e07cb96ecf1f449b2ebdb0e1115

Patch
Kernel Git
https://git.kernel.org/stable/c/8cafcb881364af5ef3a8b9fed4db254054033d8a

Patch
Kernel Git
https://git.kernel.org/stable/c/955c5d670b5ae07c78f4345e23a895638db96ce1

Patch
Kernel Git
https://git.kernel.org/stable/c/9894c79fd9466612d0514be157b5c30cd93aa645

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-45915

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-06-24

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-45915?

CVE-2026-45915 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 2.6.19 onward and has been patched in 5.10.252, 5.15.202, 6.1.165 and others. CVE-2026-45915 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-45915?

CVE-2026-45915 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-2026-45915?

Yes. CVE-2026-45915 has been patched. Fixed versions include 5.10.252, 5.15.202, 6.1.165 and others. If you are running Linux kernel 2.6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45915 actively exploited?

No. CVE-2026-45915 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.