Bug 2464419 (CVE-2026-31738) - CVE-2026-31738 kernel: vxlan: validate ND option lengths in vxlan_na_create
Summary: CVE-2026-31738 kernel: vxlan: validate ND option lengths in vxlan_na_create
Keywords:
Status: NEW
Alias: CVE-2026-31738
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-01 15:05 UTC by OSIDB Bzimport
Modified: 2026-05-01 21:35 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:


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Description OSIDB Bzimport 2026-05-01 15:05:49 UTC
In the Linux kernel, the following vulnerability has been resolved:

vxlan: validate ND option lengths in vxlan_na_create

vxlan_na_create() walks ND options according to option-provided
lengths. A malformed option can make the parser advance beyond the
computed option span or use a too-short source LLADDR option payload.

Validate option lengths against the remaining NS option area before
advancing, and only read source LLADDR when the option is large enough
for an Ethernet address.


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