What is CVE-2026-45899?

CVE-2026-45899 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 3.12 onward and patched in 5.10.253, 5.15.203, 6.6.130 and others. CVE-2026-45899 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45899?

CVE-2026-45899 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-2026-45899?

Yes, CVE-2026-45899 has been patched. Fixed versions include 5.10.253, 5.15.203, 6.6.130 and others. If you are running Linux kernel 3.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45899 actively exploited?

CVE-2026-45899 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-45899

Medium

In the Linux kernel, the following vulnerability has been resolved: ext4: drop extent cache when splitting extent fails When the split extent fails, we might leave some extents still being processed and return an error directly, which will result in stale extent entries remaining in the extent status tree. So drop all of the remaining potentially stale extents if the splitting fails.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-06-25

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 3.12 and later are affected. Fixed in 5.10.253, 5.15.203, 6.6.130, 6.12.75, 6.18.14, 6.19.4, 7.0 and their respective stable series.

Affected from

≥ 3.12

Fixed in

✓ 5.10.253 5.10.x ✓ 5.15.203 5.15.x ✓ 6.6.130 6.6.x ✓ 6.12.75 6.12.x ✓ 6.18.14 6.18.x ✓ 6.19.4 6.19.x ✓ 7.0

References

7 total

Kernel Git
https://git.kernel.org/stable/c/120c6bd7ca9d3e80a968b758cbb3fbd67570f132

Patch
Kernel Git
https://git.kernel.org/stable/c/31bf37cf53ede8145e2bc62da803d4506da92975

Patch
Kernel Git
https://git.kernel.org/stable/c/337506dc652383c80839edb8d8dcdd8ff2129b4f

Patch
Kernel Git
https://git.kernel.org/stable/c/6e54f8dfee359bbd58086c883ea8cffd5312999d

Patch
Kernel Git
https://git.kernel.org/stable/c/79b592e8f1b435796cbc2722190368e3e8ffd7a1

Patch

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2026-45899

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-06-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-45899?

CVE-2026-45899 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 3.12 onward and has been patched in 5.10.253, 5.15.203, 6.6.130 and others. CVE-2026-45899 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-45899?

CVE-2026-45899 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-2026-45899?

Yes. CVE-2026-45899 has been patched. Fixed versions include 5.10.253, 5.15.203, 6.6.130 and others. If you are running Linux kernel 3.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45899 actively exploited?

No. CVE-2026-45899 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.