Network policy removal via unchecked BPF detach
Published May 27, 2026 · Updated May 27, 2026
Missing authorization in the Linux Kernel BPF subsystem allows local users to detach tcx or netkit programs through a local syscall. When no program fd is supplied, the BPF_PROG_DETACH path proceeds without checking CAP_NET_ADMIN or CAP_SYS_ADMIN before detaching the program. A basic local account and an existing tcx or netkit attachment are sufficient; repeated calls can remove network-policy programs, expose traffic, and interrupt connectivity.
Summary
What happened
Missing authorization in the Linux Kernel BPF subsystem allows local users to detach tcx or netkit programs through a local syscall. When no program fd is supplied, the BPF_PROG_DETACH path proceeds without checking CAP_NET_ADMIN or CAP_SYS_ADMIN before detaching the program. A basic local account and an existing tcx or netkit attachment are sufficient; repeated calls can remove network-policy programs, expose traffic, and interrupt connectivity.
The record
- CVE
- CVE-2026-45932
- Published
- May 27, 2026
- Updated
- May 27, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1562.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 27, 2026CVE publishedPublication date reported by the CVE source.
- May 27, 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=6.6
- Affected versionversion=e420bed025071a623d2720a92bc2245c84757ecb <3f04cc1e5374da4c5e791ae010a06cfea7bacbe6
- Affected versionversion=e420bed025071a623d2720a92bc2245c84757ecb <4e0772cded109c238411f2fac36ac39302758b81
- Affected versionversion=e420bed025071a623d2720a92bc2245c84757ecb <ae23bc81ddf7c17b663c4ed1b21e35527b0a7131
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
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Technologies
Your stack
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Your stack
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