Kernel interruption via unlocked sock_ops callback
Published Aug 15, 2026 · Updated Aug 15, 2026
Race condition in Linux kernel TCP teardown allows remote attackers to interrupt BPF-enabled hosts via failed child-socket setup. A failed tcp_v4_syn_recv_sock or tcp_v6_syn_recv_sock path drops the child lock, yet an inherited BPF_SOCK_OPS_STATE_CB_FLAG makes tcp_done invoke tcp_call_bpf on the unlocked, partially destroyed socket. Reachability requires a listener with a cgroup BPF sock_ops program enabling state callbacks; repeated triggers produce a warning and can cause an oops or panic.
Summary
What happened
Race condition in Linux kernel TCP teardown allows remote attackers to interrupt BPF-enabled hosts via failed child-socket setup. A failed tcp_v4_syn_recv_sock or tcp_v6_syn_recv_sock path drops the child lock, yet an inherited BPF_SOCK_OPS_STATE_CB_FLAG makes tcp_done invoke tcp_call_bpf on the unlocked, partially destroyed socket. Reachability requires a listener with a cgroup BPF sock_ops program enabling state callbacks; repeated triggers produce a warning and can cause an oops or panic.
The record
- CVE
- CVE-2026-74268
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-362, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.16
- Affected versionversion=d44874910a26f3a8f81edf873a2473363f07f660 <8874dafc9099bc49c2e5ebba030f85d276421f92
- Affected versionversion=d44874910a26f3a8f81edf873a2473363f07f660 <990348e5bb457697c2f1f7f7b65154a3334d9d2b
- Affected versionversion=d44874910a26f3a8f81edf873a2473363f07f660 <ce311bd2e36596f0aa2c92ca86fb3e019ac57eae
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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