Unrated severityNVD Advisory· Published Feb 4, 2026· Updated Feb 9, 2026
fou: Don't allow 0 for FOU_ATTR_IPPROTO.
CVE-2026-23083
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
79- osv-coords77 versionspkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2016.0pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-livepatch-SLE15-SP7-RT_Update_10&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7pkg:rpm/suse/kernel-livepatch-SLE15-SP7_Update_10&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/kernel-obs-qa&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-obs-qa&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_78&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5
< 6.12.0-160000.27.1+ 76 more
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1.160000.2.8
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.4.0-150700.53.34.1.150700.17.23.1
- (no CPE)range: < 6.12.0-160000.27.1.160000.2.8
- (no CPE)range: < 6.12.0-160000.27.1.160000.2.8
- (no CPE)range: < 6.4.0-40.1.21.17
- (no CPE)range: < 6.4.0-40.1.21.17
- (no CPE)range: < 6.12.0-160000.27.1.160000.2.8
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 4.12.14-122.296.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 4.12.14-122.296.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 4.12.14-122.296.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 1-150700.1.3.1
- (no CPE)range: < 1-150700.15.3.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.4.0-150700.7.34.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 4.12.14-122.296.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 4.12.14-122.296.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-150700.7.34.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 4.12.14-122.296.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 4.12.14-122.296.1
- (no CPE)range: < 6.4.0-150700.7.34.1
- (no CPE)range: < 6.4.0-150700.53.34.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 6.12.0-160000.27.1
- (no CPE)range: < 1-8.3.1
Patches
Vulnerability mechanics
References
7- git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771mitre
- git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91eamitre
- git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19mitre
- git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5mitre
- git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956mitre
- git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823mitre
- git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03mitre
News mentions
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