What is CVE-2026-80588?

CVE-2026-80588 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10, affecting Linux kernel versions from 6.18.35 onward and patched in 6.18.46, 7.1.10 and 7.2. CVE-2026-80588 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-80588?

CVE-2026-80588 has a CVSS score of 7.5 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-80588?

Yes, CVE-2026-80588 has been patched. Fixed versions include 6.18.46, 7.1.10 and 7.2. If you are running Linux kernel 6.18.35 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-80588 actively exploited?

CVE-2026-80588 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-80588

High

In the Linux kernel, the following vulnerability has been resolved: mptcp: reclaim forward-allocated memory on RX path errors After commit 9db5b3cec4ec ("mptcp: borrow forward memory from subflow"), errors in the receive path prior to queueing skbs into the receive queue do not trigger forward-allocated memory reclaiming. Prevent forward memory from growing unboundedly in pathological drop scenarios by explicitly reclaiming memory when skbs are dropped.

Package Linux Kernel

Published 2026-08-26

Last modified 2026-08-27

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.5

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.18.35, 6.19 and later are affected. Fixed in 6.18.46, 7.1.10, 7.2 and their respective stable series.

Affected from

≥ 6.18.35 ≥ 6.19

Fixed in

✓ 6.18.46 6.18.x ✓ 7.1.10 7.1.x ✓ 7.2

References

3 total

Details

CVE ID CVE-2026-80588

Severity High

CVSS score 7.5 / 10

CVSS version 3.1

Published 2026-08-26

Modified 2026-08-27

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-80588?

CVE-2026-80588 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10 . It affects Linux kernel versions from 6.18.35 onward and has been patched in 6.18.46, 7.1.10 and 7.2. CVE-2026-80588 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-80588?

CVE-2026-80588 has a CVSS score of 7.5 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-80588?

Yes. CVE-2026-80588 has been patched. Fixed versions include 6.18.46, 7.1.10 and 7.2. If you are running Linux kernel 6.18.35 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-80588 actively exploited?

No. CVE-2026-80588 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.