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CVE-2026-80738

bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie

Published: Sep 3, 2026Updated: Sep 4, 2026 Sources: CVE List NVD
7.3HIGH
NVD MITRE
EPSS Score
0.1%
Top 98.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:L
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
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Affected Products

Linux
oss-projectaka the linux kernel
LinuxOn-premOS
Operating Systems / linux-distro

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

https://git.kernel.org/stable/c/23f682083aa3fbc0c49667818efd6979a8bc5ac2
git.kernel.org
https://git.kernel.org/stable/c/31a420a822ff92e2090bd5d65efe8e34e2d6d9b8
git.kernel.org
News mentions
1

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