Local service hang via recursive neighbor-table locking
Published Jun 20, 2024 · Updated May 11, 2026
Deadlock in the Linux kernel 5.16 through 5.16.7 allows local users to hang the system by failing an NTF_MANAGED neighbor entry. neigh_managed_work holds the neighbor-table lock while __neigh_event_send triggers an immediate neigh_probe, which recursively attempts to acquire that lock. Low-privileged local access and an NTF_MANAGED entry are required; the established consequence is a kernel deadlock and service hang, not data access or modification.
Summary
What happened
Deadlock in the Linux kernel 5.16 through 5.16.7 allows local users to hang the system by failing an NTF_MANAGED neighbor entry. neigh_managed_work holds the neighbor-table lock while __neigh_event_send triggers an immediate neigh_probe, which recursively attempts to acquire that lock. Low-privileged local access and an NTF_MANAGED entry are required; the established consequence is a kernel deadlock and service hang, not data access or modification.
The record
- CVE
- CVE-2022-48719
- Published
- Jun 20, 2024
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-667, CAPEC-25, T1499.004
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Jun 20, 2024CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.16
- Affected versionversion=7482e3841d520a368426ac196720601687e2dc47 <203a35ebb49cdce377416b0690215d3ce090d364
- Affected versionversion=7482e3841d520a368426ac196720601687e2dc47 <4a81f6da9cb2d1ef911131a6fd8bd15cb61fc772
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
- syzbot managed-neighbor deadlock reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo