Denial of service via sleepable cgroup BPF program
Published Aug 15, 2026 · Updated Aug 15, 2026
Denial of service in the Linux kernel 6.0 through 7.1.4 allows local users to trigger an invalid-context kernel fault through a BPF program. The verifier accepts a BPF_LSM_CGROUP program marked BPF_F_SLEEPABLE even though the cgroup shim executes under rcu_read_lock_dont_migrate(), where sleeping is invalid. Reaching the path requires bypassing libbpf with bpf(2) and attaching the program to an LSM cgroup hook; the demonstrated consequence is a kernel splat.
Summary
What happened
Denial of service in the Linux kernel 6.0 through 7.1.4 allows local users to trigger an invalid-context kernel fault through a BPF program. The verifier accepts a BPF_LSM_CGROUP program marked BPF_F_SLEEPABLE even though the cgroup shim executes under rcu_read_lock_dont_migrate(), where sleeping is invalid. Reaching the path requires bypassing libbpf with bpf(2) and attaching the program to an LSM cgroup hook; the demonstrated consequence is a kernel splat.
The record
- CVE
- CVE-2026-74338
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
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
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Is a vulnerable build present?
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- Affected versionversion=6.0
- Affected versionversion=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <5b038319be442c620f774e6fc9e9283deeca1c75
- Affected versionversion=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <be9eaf2bb5db4ad3de61ef739fd268fd7f135737
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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