Kernel crash via double socket release
Published Aug 5, 2026 · Updated Aug 5, 2026
Expired pointer dereference in the BPF TCP iterator in Linux 6.17 allows local users to crash the kernel through local BPF syscalls. The batch-growth failure path leaves socket cookies in slots still marked as live, so bpf_iter_tcp_seq_stop() releases the batch again and treats a cookie as a struct sock pointer. Exploitation requires CAP_BPF and CAP_PERFMON, more than INIT_BATCH_SZ sockets in one hash bucket, and memory pressure that makes reallocation fail; the demonstrated outcome is a kernel panic.
Summary
What happened
Expired pointer dereference in the BPF TCP iterator in Linux 6.17 allows local users to crash the kernel through local BPF syscalls. The batch-growth failure path leaves socket cookies in slots still marked as live, so bpf_iter_tcp_seq_stop() releases the batch again and treats a cookie as a struct sock pointer. Exploitation requires CAP_BPF and CAP_PERFMON, more than INIT_BATCH_SZ sockets in one hash bucket, and memory pressure that makes reallocation fail; the demonstrated outcome is a kernel panic.
The record
- CVE
- CVE-2026-64575
- Published
- Aug 5, 2026
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-825, T1499
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 5, 2026CVE publishedPublication date reported by the CVE source.
- Aug 5, 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=6.17
- Affected versionversion=cdec67a489d4fdae3e83e04fca0419136a83c4c2 <8a726e9585ffe7bfbfad2b5279277a00973970f3
- Affected versionversion=cdec67a489d4fdae3e83e04fca0419136a83c4c2 <980a813452754f8001704744e92f7aa697c53dd3
- Affected versionversion=cdec67a489d4fdae3e83e04fca0419136a83c4c2 <9f27c4f0ae35b5390ce4f7a54d3501144e41a54d
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.
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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