Linux Kernel TCP stack Vulnerability Rated 7.3 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-80738

Key Details

CVE	CVE-2026-80738
CVSS Score / Version	7.3 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is low.
Affected products	Linux Kernel
Exploitation prediction (EPSS)	0.16% probability of exploitation in the next 30 days (5% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-80738
CVE	https://www.cve.org/CVERecord?id=CVE-2026-80738

Source

Reference

NVD

CVE