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CVE

CVE-2026-72417

netfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()
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CVE

CVE-2026-72417

netfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()

In the Linux kernel, the following vulnerability has been resolved:

netfilter: flowtable: Validate iph->ihl in nfflowip4tunnelproto()

Add sanity check for iph->ihl field in nfflowip4tunnelproto() 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/025a41e76b51fbc7b8eaa5bacbaa9621d00e6aa7, https://git.kernel.org/stable/c/84460b644329e25809b4a6d9279d6359d7fd8ebc, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72417.json, https://nvd.nist.gov/vuln/detail/CVE-2026-72417, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00554%
EPSS Percentile
0.43874%
Introduced Version
ab427db17885814069bae891834f20842f0ac3a4,6.19.0,0
Fix Available
84460b644329e25809b4a6d9279d6359d7fd8ebc,7.1.5

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