What is CVE-2026-23459?

CVE-2026-23459 is a High severity Linux kernel vulnerability with a CVSS score of 8.2 out of 10, affecting Linux kernel versions from 6.14 onward and patched in 6.19.10 and 7.0. CVE-2026-23459 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23459?

CVE-2026-23459 has a CVSS score of 8.2 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:L/A:H.

Is there a patch available for CVE-2026-23459?

Yes, CVE-2026-23459 has been patched. Fixed versions include 6.19.10 and 7.0. If you are running Linux kernel 6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-23459 actively exploited?

CVE-2026-23459 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-23459

High

In the Linux kernel, the following vulnerability has been resolved: ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS Blamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which call iptunnel_xmit_stats(). iptunnel_xmit_stats() was assuming tunnels were only using NETDEV_PCPU_STAT_TSTATS. @syncp offset in pcpu_sw_netstats and pcpu_dstats is different. 32bit kernels would either have corruptions or freezes if the syncp sequence was overwritten. This patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid a potential cache line miss since iptunnel_xmit_stats() needs to read it.

Package Linux Kernel

Published 2026-04-03

Last modified 2026-05-26

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.2

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.14 and later are affected. Fixed in 6.19.10, 7.0 and their respective stable series.

Affected from

≥ 6.14

Fixed in

✓ 6.19.10 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-23459 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/0d087d00161f562d5047cc4009bb0c6a19daf9f1
Patch
Kernel patch commit
https://git.kernel.org/stable/c/8431c602f551549f082bbfa67f3003f2d8e3e132
Patch

Details

CVE ID CVE-2026-23459

Severity High

CVSS score 8.2 / 10

CVSS version 3.1

Published 2026-04-03

Modified 2026-05-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-23459?

CVE-2026-23459 is a High severity Linux kernel vulnerability with a CVSS score of 8.2 out of 10 . It affects Linux kernel versions from 6.14 onward and has been patched in 6.19.10 and 7.0. CVE-2026-23459 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-23459?

CVE-2026-23459 has a CVSS score of 8.2 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:L/A:H.
Is there a patch available for CVE-2026-23459?

Yes — CVE-2026-23459 has been patched. Fixed versions include 6.19.10 and 7.0. If you are running Linux kernel 6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-23459 actively exploited?

No — CVE-2026-23459 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.