What is CVE-2026-23069?

CVE-2026-23069 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 4.8 onward and patched in 6.1.162, 6.6.122, 6.12.68 and others. CVE-2026-23069 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23069?

CVE-2026-23069 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-2026-23069?

Yes, CVE-2026-23069 has been patched. Fixed versions include 6.1.162, 6.6.122, 6.12.68 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-2026-23069 actively exploited?

CVE-2026-23069 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-23069

Medium

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix potential underflow in virtio_transport_get_credit() The credit calculation in virtio_transport_get_credit() uses unsigned arithmetic: ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); If the peer shrinks its advertised buffer (peer_buf_alloc) while bytes are in flight, the subtraction can underflow and produce a large positive value, potentially allowing more data to be queued than the peer can handle. Reuse virtio_transport_has_space() which already handles this case and add a comment to make it clear why we are doing that. [Stefano: use virtio_transport_has_space() instead of duplicating the code] [Stefano: tweak the commit message]

Package Linux Kernel

Published 2026-02-04

Last modified 2026-03-13

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

Weakness type

CWE-191

CVE-2026-23069 is classified as CWE-191

See CWE-191 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.8 and later are affected. Fixed in 6.1.162, 6.6.122, 6.12.68, 6.18.8, 6.19 and their respective stable series.

Affected from

≥ 4.8

Fixed in

✓ 6.1.162 6.1.x ✓ 6.6.122 6.6.x ✓ 6.12.68 6.12.x ✓ 6.18.8 6.18.x ✓ 6.19

References

5 total

Kernel Git
https://git.kernel.org/stable/c/02f9af192b98d15883c70dd41ac76d1b0217c899

Patch
Kernel Git
https://git.kernel.org/stable/c/3ef3d52a1a9860d094395c7a3e593f3aa26ff012

Patch
Kernel Git
https://git.kernel.org/stable/c/d05bc313788f0684b27f0f5b60c52a844669b542

Patch
Kernel Git
https://git.kernel.org/stable/c/d96de882d6b99955604669d962ae14e94b66a551

Patch
Kernel Git
https://git.kernel.org/stable/c/ec0f1b3da8061be3173d1c39faaf9504f91942c3

Patch

Details

CVE ID CVE-2026-23069

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-02-04

Modified 2026-03-13

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-23069?

CVE-2026-23069 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.8 onward and has been patched in 6.1.162, 6.6.122, 6.12.68 and others. CVE-2026-23069 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-23069?

CVE-2026-23069 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-2026-23069?

Yes. CVE-2026-23069 has been patched. Fixed versions include 6.1.162, 6.6.122, 6.12.68 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-2026-23069 actively exploited?

No. CVE-2026-23069 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.