What is CVE-2026-89500?

CVE-2026-89500 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 6.8 onward and patched in 6.12.112, 6.18.51, 7.2.4 and others. CVE-2026-89500 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-89500?

CVE-2026-89500 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-89500?

Yes, CVE-2026-89500 has been patched. Fixed versions include 6.12.112, 6.18.51, 7.2.4 and others. If you are running Linux kernel 6.8 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-89500 actively exploited?

CVE-2026-89500 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-89500

High

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page Discarding a cached reader page after a concurrent ring buffer resize uses the new global subbuf_order for the free_pages() call. This mismatched order may crashes the kernel or leaks memory because the cached page was allocated under the old size. Save the actual free_page order alongside the page address to ensure we always refer to the correct value and do not rely on the potentially stalled cpu_buffer->subbuf_order value. The simplest is to make free_page a buffer_data_read_page which already covers exactly what we need: a page address and a page order.

Package Linux Kernel

Published 2026-09-11

Last modified 2026-10-03

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.8 and later are affected. Fixed in 6.12.112, 6.18.51, 7.2.4, 7.3-rc1 and their respective stable series.

Affected from

≥ 6.8

Fixed in

✓ 6.12.112 6.12.x ✓ 6.18.51 6.18.x ✓ 7.2.4 7.2.x ✓ 7.3-rc1

References

4 total

Details

CVE ID CVE-2026-89500

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-09-11

Modified 2026-10-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-89500?

CVE-2026-89500 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 6.8 onward and has been patched in 6.12.112, 6.18.51, 7.2.4 and others. CVE-2026-89500 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-89500?

CVE-2026-89500 has a CVSS score of 7.8 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:H/I:H/A:H.
Is there a patch available for CVE-2026-89500?

Yes. CVE-2026-89500 has been patched. Fixed versions include 6.12.112, 6.18.51, 7.2.4 and others. If you are running Linux kernel 6.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-89500 actively exploited?

No. CVE-2026-89500 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.