What is CVE-2026-80738?

CVE-2026-80738 is a High severity Linux kernel vulnerability with a CVSS score of 7.3 out of 10, affecting Linux kernel versions from 5.2 onward and patched in 6.18.57, 7.1.9 and 7.2. CVE-2026-80738 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-80738?

CVE-2026-80738 has a CVSS score of 7.3 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:L.

Is there a patch available for CVE-2026-80738?

Yes, CVE-2026-80738 has been patched. Fixed versions include 6.18.57, 7.1.9 and 7.2. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-80738 actively exploited?

CVE-2026-80738 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-80738

High

In the Linux kernel, the following vulnerability has been resolved: bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie accept a socket pointer 'sk' with argument type ARG_PTR_TO_BTF_ID_SOCK_COMMON. However, they access sk->sk_protocol without validating whether 'sk' represents a full socket. Fix this issue by checking sk->sk_state != TCP_LISTEN before inspecting sk->sk_protocol in both bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie. Since mini-sockets are never in the TCP_LISTEN state, the condition short-circuits and prevents dereferencing fullsock-specific fields.

Package Linux Kernel

Published 2026-09-03

Last modified 2026-10-15

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.3

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

Vector string

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

Affected versions

Linux kernel versions 5.2 and later are affected. Fixed in 6.18.57, 7.1.9, 7.2 and their respective stable series.

Affected from

≥ 5.2

Fixed in

✓ 6.18.57 6.18.x ✓ 7.1.9 7.1.x ✓ 7.2

References

3 total

Details

CVE ID CVE-2026-80738

Severity High

CVSS score 7.3 / 10

CVSS version 3.1

Published 2026-09-03

Modified 2026-10-15

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-80738?

CVE-2026-80738 is a High severity Linux kernel vulnerability with a CVSS score of 7.3 out of 10 . It affects Linux kernel versions from 5.2 onward and has been patched in 6.18.57, 7.1.9 and 7.2. CVE-2026-80738 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-80738?

CVE-2026-80738 has a CVSS score of 7.3 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:L.
Is there a patch available for CVE-2026-80738?

Yes. CVE-2026-80738 has been patched. Fixed versions include 6.18.57, 7.1.9 and 7.2. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-80738 actively exploited?

No. CVE-2026-80738 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.