Medium severity5.5NVD Advisory· Published Mar 25, 2026· Updated May 29, 2026
CVE-2026-23293
CVE-2026-23293
Description
In the Linux kernel, the following vulnerability has been resolved:
net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled
When booting with the 'ipv6.disable=1' parameter, the nd_tbl is never initialized because inet6_init() exits before ndisc_init() is called which initializes it. If an IPv6 packet is injected into the interface, route_shortcircuit() is called and a NULL pointer dereference happens on neigh_lookup().
BUG: kernel NULL pointer dereference, address: 0000000000000380 Oops: Oops: 0000 [#1] SMP NOPTI [...] RIP: 0010:neigh_lookup+0x20/0x270 [...] Call Trace:
vxlan_xmit+0x638/0x1ef0 [vxlan] dev_hard_start_xmit+0x9e/0x2e0 __dev_queue_xmit+0xbee/0x14e0 packet_sendmsg+0x116f/0x1930 __sys_sendto+0x1f5/0x200 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x12f/0x1590 entry_SYSCALL_64_after_hwframe+0x76/0x7e
Fix this by adding an early check on route_shortcircuit() when protocol is ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because VXLAN can be built-in even when IPv6 is built as a module.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
39- osv-coords38 versionspkg:linux/kernelpkg: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%20Micro%206.2pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Micro%205.2pkg: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%20Micro%205.2pkg: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-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_11&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.2pkg: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%20Micro%205.2pkg: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%20Enterprise%20Micro%205.2pkg: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-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7
>= 3.12.0, < 6.1.167+ 37 more
- (no CPE)range: >= 3.12.0, < 6.1.167
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.27.1.160000.2.8
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 5.3.18-150300.59.241.1.150300.18.144.1
- (no CPE)range: < 6.4.0-41.1.21.18
- (no CPE)range: < 6.4.0-41.1.21.18
- (no CPE)range: < 6.12.0-160000.27.1.160000.2.8
- (no CPE)range: < 5.3.18-150300.59.241.1
- (no CPE)range: < 6.4.0-41.1
- (no CPE)range: < 6.4.0-41.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.4.0-41.1
- (no CPE)range: < 6.4.0-41.1
- (no CPE)range: < 1-150700.1.3.1
- (no CPE)range: < 5.3.18-150300.241.1
- (no CPE)range: < 6.4.0-41.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 6.4.0-150700.7.37.2
- (no CPE)range: < 5.3.18-150300.59.241.1
- (no CPE)range: < 6.4.0-41.1
- (no CPE)range: < 6.4.0-41.1
- (no CPE)range: < 6.12.0-160000.28.1
- (no CPE)range: < 5.3.18-150300.241.1
- (no CPE)range: < 6.4.0-41.1
- (no CPE)range: < 6.4.0-150700.7.37.2
- (no CPE)range: < 6.4.0-150700.7.37.1
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7envdPatch
- git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434nvdPatch
- git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0nvdPatch
- git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcdnvdPatch
- git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45nvdPatch
- git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bcnvdPatch
- git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7nvdPatch
- git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fbnvdPatch
News mentions
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