Kernel disclosure and crash via undersized header pulls
Published Aug 15, 2026 · Updated Aug 15, 2026
Out-of-bounds access in Linux VXLAN allows remote attackers to disclose kernel data, redirect traffic, or crash affected hosts. In vxlan_xmit, arp_reduce, and vxlan_mdb_entry_skb_get, pskb_may_pull checks from the MAC-header data pointer without adding the 14-byte network offset, leaving network headers partly in non-linear fragments. Exploitation requires an existing VXLAN device with proxy or MDB handling and crafted overlay traffic; consequences are limited to kernel-data exposure, forwarding manipulation, or host failure.
Summary
What happened
Out-of-bounds access in Linux VXLAN allows remote attackers to disclose kernel data, redirect traffic, or crash affected hosts. In vxlan_xmit, arp_reduce, and vxlan_mdb_entry_skb_get, pskb_may_pull checks from the MAC-header data pointer without adding the 14-byte network offset, leaving network headers partly in non-linear fragments. Exploitation requires an existing VXLAN device with proxy or MDB handling and crafted overlay traffic; consequences are limited to kernel-data exposure, forwarding manipulation, or host failure.
The record
- CVE
- CVE-2026-74474
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 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=3.8
- Affected versionversion=e4f67addf158f98f8197e08974966b18480dc751 <7076a34b6e33315dc160b4612bfea1c597495585
- Affected versionversion=e4f67addf158f98f8197e08974966b18480dc751 <94dee751aad627b3645d424b5d0c736d394573e9
- Affected versionversion=e4f67addf158f98f8197e08974966b18480dc751 <b9553558b48db54ac9273e6b98d7263ef5c1a329
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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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Your stack
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