CVE-2026-23293net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled
- 5.5MediumCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 – < 649e2bb74da54c96cf20729001e283626a2fefa0
- affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 – < dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc
- affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 – < b5190fcd75a1f1785c766a8d1e44d3938e168f45
- affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 – < 5f93e6b4d12bd3a4517a6d447ea675f448f21434
- affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 – < f0373e9317bc904e7bdb123d3106fe4f3cea2fb7
- affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 – < fbbd2118982c55fb9b0a753ae0cf7194e77149fb
- affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 – < abcd48ecdeb2e12eccb8339a35534c757782afcd
- affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 – < 168ff39e4758897d2eee4756977d036d52884c7e
- affected 3.12
- unaffected < 3.12
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.77 – ≤ 6.12.*
- unaffected 6.18.17 – ≤ 6.18.*
- unaffected 6.19.7 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References11
- https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0 (opens in a new tab)
- https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc (opens in a new tab)
- https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45 (opens in a new tab)
- https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434 (opens in a new tab)
- https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7 (opens in a new tab)
- https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb (opens in a new tab)
- https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd (opens in a new tab)
- https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-15224 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-23293)Record last updated .