What is CVE-2026-89840?

CVE-2026-89840 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, affecting Linux kernel versions from 4.8 onward and patched in 6.12.112, 6.18.53, 7.2.5 and others. CVE-2026-89840 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-89840?

CVE-2026-89840 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

Is there a patch available for CVE-2026-89840?

Yes, CVE-2026-89840 has been patched. Fixed versions include 6.12.112, 6.18.53, 7.2.5 and others. If you are running Linux kernel 4.8 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-89840 actively exploited?

CVE-2026-89840 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-89840

High

In the Linux kernel, the following vulnerability has been resolved: f2fs: validate MOVE_RANGE destination size F2FS_IOC_MOVE_RANGE checks the source range, but not the destination end before updating i_size. A source hole can expose this: __clone_blkaddrs() skips NULL_ADDR entries and returns success, so the caller can still extend the destination inode with unchecked pos_out + len. Reject destination overflow and use inode_newsize_ok() before extending the destination inode.

Package Linux Kernel

Published 2026-09-16

Last modified 2026-10-03

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 4.8 and later are affected. Fixed in 6.12.112, 6.18.53, 7.2.5, 7.3-rc1 and their respective stable series.

Affected from

≥ 4.8

Fixed in

✓ 6.12.112 6.12.x ✓ 6.18.53 6.18.x ✓ 7.2.5 7.2.x ✓ 7.3-rc1

References

4 total

Details

CVE ID CVE-2026-89840

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2026-09-16

Modified 2026-10-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-89840?

CVE-2026-89840 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 . It affects Linux kernel versions from 4.8 onward and has been patched in 6.12.112, 6.18.53, 7.2.5 and others. CVE-2026-89840 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-89840?

CVE-2026-89840 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
Is there a patch available for CVE-2026-89840?

Yes. CVE-2026-89840 has been patched. Fixed versions include 6.12.112, 6.18.53, 7.2.5 and others. If you are running Linux kernel 4.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-89840 actively exploited?

No. CVE-2026-89840 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.