Kernel panic via uninitialized BPF LSM offset
Published Jul 20, 2026 · Updated Jul 20, 2026
Denial of service in affected Linux Kernel releases allows local users to trigger a kernel panic through a privileged BPF map update. A stale eight-byte bpf_lsm_blob_sizes.lbs_inode offset makes bpf_inode() alias the inode security blob's rcu_head.func pointer, which cleanup clears before RCU executes it. Exploitation requires CONFIG_BPF_LSM=y, the BPF LSM omitted at boot, and privilege to create and update an inode-storage map; execution of the cleared callback crashes the host.
Summary
What happened
Denial of service in affected Linux Kernel releases allows local users to trigger a kernel panic through a privileged BPF map update. A stale eight-byte bpf_lsm_blob_sizes.lbs_inode offset makes bpf_inode() alias the inode security blob's rcu_head.func pointer, which cleanup clears before RCU executes it. Exploitation requires CONFIG_BPF_LSM=y, the BPF LSM omitted at boot, and privilege to create and update an inode-storage map; execution of the cleared callback crashes the host.
The record
- CVE
- CVE-2026-64192
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-476, T1499
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 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=5.10
- Affected versionversion=8ea636848aca35b9f97c5b5dee30225cf2dd0fe6 <a6f0643e4f63cfaa0d5d4a69de4f132eac4b8fe4
- Affected versionversion=8ea636848aca35b9f97c5b5dee30225cf2dd0fe6 <c76b8abce575e0c6e4096957220b4515ed847d89
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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Your stack
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