Riskcovery

CVE-2026-23293

net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled

State
Published
Severity
Not scored
Published
Mar 25, 2026
Updated
Oct 15, 2026
Reserved
Jan 13, 2026

Read the record on cve.org

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: <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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 to before 649e2bb74da54c96cf20729001e283626a2fefa0Affected
  • e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 to before dc3e62cf3bbf66280a907ec379f373d0c3b8b2bcAffected
  • e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 to before b5190fcd75a1f1785c766a8d1e44d3938e168f45Affected
  • e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 to before 5f93e6b4d12bd3a4517a6d447ea675f448f21434Affected
  • e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 to before f0373e9317bc904e7bdb123d3106fe4f3cea2fb7Affected
  • e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 to before fbbd2118982c55fb9b0a753ae0cf7194e77149fbAffected
  • e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 to before abcd48ecdeb2e12eccb8339a35534c757782afcdAffected
  • e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 to before 168ff39e4758897d2eee4756977d036d52884c7eAffected
LinuxLinux
  • 3.12Affected
  • before 3.12Not affected
  • 5.10.253 through 5.10.*Not affected
  • 5.15.203 through 5.15.*Not affected
  • 6.1.167 through 6.1.*Not affected
  • 6.6.130 through 6.6.*Not affected
  • 6.12.77 through 6.12.*Not affected
  • 6.18.17 through 6.18.*Not affected
  • 6.19.7 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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