Local kernel memory corruption via flow-rule race
Published May 1, 2025 · Updated Aug 5, 2026
Use-after-free in Linux nf_tables in affected 5.x kernels allows local users to corrupt kernel memory through a control-plane race. During NFT_MSG_DELRULE commit, delayed nft_flow_rule_destroy leaves an offloaded flow-rule object referenced until nft_commit_release while the netlink notifier can free it. Low-privileged local access and a hardware-offloaded chain are required; successful exploitation can disclose or alter kernel memory or crash the system.
Summary
What happened
Use-after-free in Linux nf_tables in affected 5.x kernels allows local users to corrupt kernel memory through a control-plane race. During NFT_MSG_DELRULE commit, delayed nft_flow_rule_destroy leaves an offloaded flow-rule object referenced until nft_commit_release while the netlink notifier can free it. Low-privileged local access and a hardware-offloaded chain are required; successful exploitation can disclose or alter kernel memory or crash the system.
The record
- CVE
- CVE-2022-49919
- Published
- May 1, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 1, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 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=330c0c6cd2150a2d7f47af16aa590078b0d2f736 <b2d7a92aff0fbd93c29d2aa6451fb99f050e2c4e
- Affected versionversion=5.10.122 <5.10.154
- Affected versionversion=5.15.47 <5.15.78
- Affected versionversion=5.17.15 <5.18
- Affected versionversion=5.18.4 <5.19
- Affected versionversion=5.19
- Affected versionversion=5.4.198 <5.4.224
- Affected versionversion=5b8d63489c3b701eb2a76f848ec94d8cbc9373b9 <74fd5839467054cd9c4d050614d3ee8788386171
- Affected versionversion=80de9ea1f5b808a6601e91111fae601df2b26369
- Affected versionversion=9dd732e0bdf538b1b76dc7c157e2b5e560ff30d3 <26b5934ff4194e13196bedcba373cd4915071d0e
- Affected versionversion=9dd732e0bdf538b1b76dc7c157e2b5e560ff30d3 <4ab6f96444e936f5e4a936d5c0bc948144bcded3
- Affected versionversion=ab9f34a30c23f656e76f4c5b83125a4e7b53c86e
- Affected versionversion=e33d9bd563e71f6c6528b96008d65524a459c4dc <6044791b7be707fd0e709f26e961a446424e5051
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
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Public exploit references
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Technologies
Your stack
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Your stack
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