Is CVE-2026-45899 in the CISA KEV catalog?

No. CVE-2026-45899 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-45899?

CVE-2026-45899 has a CVSS v3 base score of 9.8 (Critical).

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

CVE-2026-45899 has an EPSS score of 0.16% (6th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-45899?

Upgrade linux on debian 11 to 5.10.257-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-45899

CRITICAL

9.8

CVSS v3

NVD

Description

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.

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.257-1CVE-2026-45899

Fixed in:6.12.85-1CVE-2026-45899

Fixed in:6.18.14-1CVE-2026-45899

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.16%probability of exploitation in 30 days

6thpercentile

Low risk: more likely to be exploited than 6% of all known CVEs.

References

Patch7

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-25.