Local privilege escalation via RCU hook-list race
Published Jun 9, 2026 · Updated Jun 9, 2026
Race condition in Linux Kernel netfilter nf_tables allows local users to escalate privileges through concurrent hook teardown and dumps. nft_netdev_unregister_hooks and __nft_unregister_flowtable_net_hooks unlink RCU-walked hook entries with list_del(), permitting concurrent dumpers to access freed or corrupted list objects. Exploitation requires CAP_NET_ADMIN, including within enabled user and network namespaces, and can expose or corrupt kernel memory or trigger a kernel panic.
Summary
What happened
Race condition in Linux Kernel netfilter nf_tables allows local users to escalate privileges through concurrent hook teardown and dumps. nft_netdev_unregister_hooks and __nft_unregister_flowtable_net_hooks unlink RCU-walked hook entries with list_del(), permitting concurrent dumpers to access freed or corrupted list objects. Exploitation requires CAP_NET_ADMIN, including within enabled user and network namespaces, and can expose or corrupt kernel memory or trigger a kernel panic.
The record
- CVE
- CVE-2026-46324
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 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?
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- Affected versionversion=3fac8ce48fa9fd61ee9056d3ed48b2edefca8b82
- Affected versionversion=4.19.316 <4.20
- Affected versionversion=5.10.198 <5.11
- Affected versionversion=5.15.45 <5.16
- Affected versionversion=5.17.13 <5.18
- Affected versionversion=5.18.2 <5.19
- Affected versionversion=5.19
- Affected versionversion=5.4.262 <5.5
- Affected versionversion=86c0154f4c3a56c5db8b9dd09e3ce885382c2c19
- Affected versionversion=9c413a8c8bb49cc16796371805ecb260e885bb2b
- Affected versionversion=a3940dcf552f2393d1e8f263b386593f98abe829
- Affected versionversion=b09e6ccf0d12f9356e8e3508d3e3dce126298538
- Affected versionversion=c73955a09408e7374d9abfd0e78ce3de9cda0635
- Affected versionversion=f9a43007d3f7ba76d5e7f9421094f00f2ef202f8 <0bd93ce4f3c35e845532184331d7917d7e562c80
- Affected versionversion=f9a43007d3f7ba76d5e7f9421094f00f2ef202f8 <0f33e8ad6ac563ae2233dd7f75884e0ee010521d
- Affected versionversion=f9a43007d3f7ba76d5e7f9421094f00f2ef202f8 <f3224ee463f8f6f6ced7dcdf6081add4f8128527
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Technologies
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Your stack
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