Medium 5.5Published Mar 25, 2026

CVE-2026-23293net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled

Updated under an hour ago (2026-10-19 09:30 UTC)

Does this affect you?

It affects Linux and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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: <TASK> 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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before 649e2bb74da54c96cf20729001e283626a2fefa0; from e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc; from e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before b5190fcd75a1f1785c766a8d1e44d3938e168f45; from e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before 5f93e6b4d12bd3a4517a6d447ea675f448f21434; from e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before f0373e9317bc904e7bdb123d3106fe4f3cea2fb7; from e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before fbbd2118982c55fb9b0a753ae0cf7194e77149fb; from e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before abcd48ecdeb2e12eccb8339a35534c757782afcd; from e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before 168ff39e4758897d2eee4756977d036d52884c7e	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 3.12 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 7.0; and 1 more ranges	NVD

References

https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0patch
https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bcpatch
https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45patch
https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434patch
https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7patch
https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fbpatch
https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcdpatch
https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7epatch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.