CVE-2026-31738
What it is
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.
At a glance
- Exploitability
- Can be exploited locally on the machine with a low-privilege account. High risk of service disruption.
- Exploit odds
- 0.1% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.1% in the next 30 days (EPSS).
- Severity: 5.5 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.1% · EPSS, next 30 days
- Record status
- Analyzed
Affected
- Linux Kernel < 3.13
- Linux Kernel < 3.14
- Linux Kernel < 5.10.253
- Linux Kernel < 5.15.203
- Linux Kernel < 6.1.168
- Linux Kernel < 6.6.134
- Linux Kernel < 6.12.81
- Linux Kernel < 6.18.22
Attack profile CVSS 3.1 · 5.5
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-31738.md and follow it. Check whether this project is affected by CVE-2026-31738. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500
- https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7
- https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958
- https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385
- https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1
- https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b
- https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3
- https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679
References
- https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500
- https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7
- https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958
- https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385
- https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1
- https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b
- https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3
- https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679