CVE-2026-72417
Critical
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto() Add sanity check for iph->ihl field in nf_flow_ip4_tunnel_proto() before using it to compute the header size, avoiding out-of-bounds access with malformed IP headers. While at it, use iph->protocol instead of the hardcoded IPPROTO_IPIP constant when setting ctx->tun.proto and reference ctx->tun.hdr_size when updating ctx->offset.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Linux
PublishedAug 15, 2026
First seenAug 15, 2026
How to fix
Update
- Linux Linux025a41e76b51fbc7b8eaa5bacbaa9621d00e6aa7, 84460b644329e25809b4a6d9279d6359d7fd8ebc or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ab427db17885814069bae891834f20842f0ac3a4 ≤ v < 025a41e76b51fbc7b8eaa5bacbaa9621d00e6aa7, ab427db17885814069bae891834f20842f0ac3a4 ≤ v < 84460b644329e25809b4a6d9279d6359d7fd8ebc, 6.19 | 025a41e76b51fbc7b8eaa5bacbaa9621d00e6aa7, 84460b644329e25809b4a6d9279d6359d7fd8ebc |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.