Local system crash via short fragment headers
Published Mar 18, 2024 · Updated May 23, 2026
Uninitialized-value use in the Linux kernel IPv6 tunnel parser allows local users to crash the system with short fragment headers. The ip6_tnl_parse_tlv_enc_lim() function reads frag_off after pulling only the IPv6 header into contiguous memory, without first ensuring that the fragment header is available. Low-privileged local access is required, and successful triggering interrupts availability without reported data disclosure or modification.
Summary
What happened
Uninitialized-value use in the Linux kernel IPv6 tunnel parser allows local users to crash the system with short fragment headers. The ip6_tnl_parse_tlv_enc_lim() function reads frag_off after pulling only the IPv6 header into contiguous memory, without first ensuring that the fragment header is available. Low-privileged local access is required, and successful triggering interrupts availability without reported data disclosure or modification.
The record
- CVE
- CVE-2024-26633
- Published
- Mar 18, 2024
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 18, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 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=3.10.106 <3.11
- Affected versionversion=3.12.71 <3.13
- Affected versionversion=3.16.42 <3.17
- Affected versionversion=3.18.49 <3.19
- Affected versionversion=3.2.87 <3.3
- Affected versionversion=4.10
- Affected versionversion=41e07a7e01d951cfd4c9a7dac90c921269d89513
- Affected versionversion=4.4.50 <4.5
- Affected versionversion=4.9.11 <4.10
- Affected versionversion=72bbf335e7aad09c88c50dbdd238f4faabd12174
- Affected versionversion=a6f6bb6bc04a5f88a31f47a6123d3fbf5ee8d694
- Affected versionversion=a7fe4e5d06338e1a82b1977eca37400951f99730
- Affected versionversion=d397f7035d2c754781bbe93b07b94d8cd898620c
- Affected versionversion=d3d9b59ab32160e3cc4edcf7e5fa7cecb53a7d25
- Affected versionversion=decccc92ee0a978a1c268b5df16824cb6384ed3c
- Affected versionversion=fbfa743a9d2a0ffa24251764f10afc13eb21e739 <135414f300c5db995e2a2f3bf0f455de9d014aee
- Affected versionversion=fbfa743a9d2a0ffa24251764f10afc13eb21e739 <3f15ba3dc14e6ee002ea01b4faddc3d49200377c
- Affected versionversion=fbfa743a9d2a0ffa24251764f10afc13eb21e739 <4329426cf6b8e22b798db2331c7ef1dd2a9c748d
- Affected versionversion=fbfa743a9d2a0ffa24251764f10afc13eb21e739 <62a1fedeb14c7ac0947ef33fadbabd35ed2400a2
- Affected versionversion=fbfa743a9d2a0ffa24251764f10afc13eb21e739 <687c5d52fe53e602e76826dbd4d7af412747e183
- Affected versionversion=fbfa743a9d2a0ffa24251764f10afc13eb21e739 <ba8d904c274268b18ef3dc11d3ca7b24a96cb087
- Affected versionversion=fbfa743a9d2a0ffa24251764f10afc13eb21e739 <d375b98e0248980681e5e56b712026174d617198
- Affected versionversion=fbfa743a9d2a0ffa24251764f10afc13eb21e739 <da23bd709b46168f7dfc36055801011222b076cd
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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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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