CVE-2026-31738
vxlan: validate ND option lengths in vxlan_na_create
Reported by linux · Published May 1, 2026
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.
EPSS 0.12% · 2.0th percentile
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| bpftool6.18 | Amazon Linux | 1:6.18.25-52.107.amzn2023 |
| kernel6.18 | Amazon Linux | 1:6.18.25-52.107.amzn2023 |
| kernel-livepatch-6.18.25-52.107 | Amazon Linux | 1:1.0-0.amzn2023 |
| kernel6.12-devel | Amazon Linux | 1:6.12.83-113.160.amzn2023 |
| kernel-libbpf-devel | Amazon Linux | 1:6.1.168-202.320.amzn2023 |
| kernel-devel | Amazon Linux | 1:6.1.168-202.320.amzn2023 |
| Linux | Linux | e476745917a1e288eb15e7ff49d286a86a4861d3, b69c4236255bd8de16cd876e58c6f0867d1d78b1, afa9a05e6c4971bd5586f1b304e14d61fb3d9385, 602596c69a70e50d9ab8c6ae0290a01f88229dd7, 3.14, 2029712fb2c87e9a8c75094906f2ee29bf08c500 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa, 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa |
| Linux | Linux | 3.14, 0, 5.10.253 |
| amazon:2023 | bpftool6.18 | 0 |
| amazon:2023 | kernel6.18 | 0 |
| amazon:2023 | kernel-livepatch-6.18.25-52.107 | 0 |
| amazon:2023 | kernel6.12-devel | 0 |
| amazon:2023 | kernel-libbpf-devel | 0 |
| amazon:2023 | kernel-devel | 0 |
| amazon:2023 | kernel-libbpf | 0 |
| amazon:2023 | bpftool6.12 | 0 |
| amazon:2023 | bpftool | 0 |
| amazon:2023 | kernel6.18-modules-extra-common | 0 |
| amazon:2023 | kernel-tools | 0 |
| amazon:2023 | perf6.12 | 0 |
| amazon:2023 | kernel6.18-headers | 0 |
| amazon:2023 | python3-perf6.12 | 0 |
| amazon:2023 | perf6.18 | 0 |
| amazon:2023 | python3-perf6.18 | 0 |
| amazon:2023 | kernel-modules-extra-common | 0 |
| amazon:2023 | kernel6.18-modules-extra | 0 |
…and 20 more
Timeline
- May 1, 2026 CVE Published
- May 18, 2026 EPSS Score (24 in total, the first dated here)
- Jun 2, 2026 Security Advisory (120 in total, the first dated here)
- Jun 17, 2026 CVE Updated
- Jul 28, 2026 Coalition ESS Score
- Aug 11, 2026 Distribution Patch (114 in total, the first dated here)
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-31738
vulnetix vdb fixes CVE-2026-31738Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-31738/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart