Kernel service interruption via TCP skb tailroom reuse
Published Feb 26, 2025 · Updated Aug 5, 2026
Denial of service in affected Linux kernel versions allows local users to interrupt availability through TCP receive processing. After skb_unclone_keeptruesize() preserves truesize but loses the original skb end offset, TCP can reuse extra tailroom from pskb_expand_head() and violate skb_try_coalesce()'s length invariant. The trigger requires local low-privileged execution with KFENCE active, and the published trace demonstrates a kernel warning rather than code execution or data access.
Summary
What happened
Denial of service in affected Linux kernel versions allows local users to interrupt availability through TCP receive processing. After skb_unclone_keeptruesize() preserves truesize but loses the original skb end offset, TCP can reuse extra tailroom from pskb_expand_head() and violate skb_try_coalesce()'s length invariant. The trigger requires local low-privileged execution with KFENCE active, and the published trace demonstrates a kernel warning rather than code execution or data access.
The record
- CVE
- CVE-2022-49142
- Published
- Feb 26, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 26, 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=097b9146c0e26aabaa6ff3e5ea536a53f5254a79 <23629b673b780d967b88a850b1518cf0f0ffc6aa
- Affected versionversion=097b9146c0e26aabaa6ff3e5ea536a53f5254a79 <2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01
- Affected versionversion=097b9146c0e26aabaa6ff3e5ea536a53f5254a79 <a903e516f5df44b46d526b403d93e7be1a425538
- Affected versionversion=097b9146c0e26aabaa6ff3e5ea536a53f5254a79 <a9a6d30264327d8ff7f23da33e7a77ffb793fa3f
- Affected versionversion=4.14.224 <4.15
- Affected versionversion=4.19.179 <4.20
- Affected versionversion=4.4.260 <4.5
- Affected versionversion=4.9.260 <4.10
- Affected versionversion=5.10.21 <5.11
- Affected versionversion=5.11.4 <5.12
- Affected versionversion=5.12
- Affected versionversion=5.4.103 <5.5
- Affected versionversion=5d55a6a46a7f70bc1d270c50200edd3096cb380c
- Affected versionversion=7118945cdf0d4b5a76eb4f5f330ac6f48d372025
- Affected versionversion=7582edf28f5d1f0a4d2f7abdb7d9560d09fd41b5
- Affected versionversion=97ff09a7ed484fef2b1bbc103857444b7332fca8
- Affected versionversion=bf5a58d143d7899d2c89e585be6e98ec81fe9683
- Affected versionversion=e6af7cb64b7b37b8a371acdbe33a636496ffb5a4
- Affected versionversion=ec697f7f3f6a89d4dd1af113587d0330b5a033e8
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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