CVE-2026-23083

HighCVSS 7.8/10Last modified Nov 10, 2026

Description

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

fou: Don't allow 0 for FOU_ATTR_IPPROTO.

fou_udp_recv() has the same problem mentioned in the previous patch.

If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu().

Let's forbid 0 for FOU_ATTR_IPPROTO.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-20

Affected software

VendorProductVersions
LinuxLinux>= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < c7498f9bc390479ccfad7c7f2332237ff4945b03; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 6e983789b7588ee59cbf303583546c043bad8e19; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 1cc98b8887cabb1808d2f4a37cd10a7be7574771; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < b7db31a52c3862a1a32202a273a4c32e7f5f4823; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 9b75dff8446ec871030d8daf5a69e74f5fe8b956; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5
LinuxLinux3.18
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)>= V3.1.6, < *
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)>= V3.1.7, < *
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)>= V3.1.6, < *
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)>= V3.1.7, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)>= V3.1.6, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)>= V3.1.7, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)>= V3.1.6, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)>= V3.1.7, < *
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)>= V3.1.6, < *
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)>= V3.1.7, < *

References

Timeline

Published
Feb 4, 2026
Last modified
Nov 10, 2026
NVD status
Modified

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CVE-2026-23083: High severity, CVSS 7.8 | Vulnix