CVE-2026-80738

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Source

https://cve.org/CVERecord?id=CVE-2026-80738

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80738.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-80738

Downstream

Published

2026-09-03T08:21:53Z

Modified

2026-10-22T02:48:53Z

Severity

7.3 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L CVSS Calculator

Summary

bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie

Details

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.

Database specific

{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80738.json"
}

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

399040847084a69f345e0a52fd62f04654e0fce3

Fixed

5702e4c259809c760912c477c4ae34e9217bb4d9

Fixed

b5525e853a2a08a9559adb84b0616025958dc542

Fixed

22c2169770ad3b3595690e51caac875178cf496d

Fixed

23f682083aa3fbc0c49667818efd6979a8bc5ac2

Fixed

31a420a822ff92e2090bd5d65efe8e34e2d6d9b8

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80738.json"

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

5.2.0

Fixed

6.6.160

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.114

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.18.57

Type: ECOSYSTEM
Events: Introduced

6.19.0

Fixed

7.1.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80738.json"