CVE-2026-23293 (GCVE-0-2026-23293)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:26 – Updated: 2026-03-25 10:26
VLAI?
Title
net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < b5190fcd75a1f1785c766a8d1e44d3938e168f45 (git)
Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < 5f93e6b4d12bd3a4517a6d447ea675f448f21434 (git)
Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < f0373e9317bc904e7bdb123d3106fe4f3cea2fb7 (git)
Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < fbbd2118982c55fb9b0a753ae0cf7194e77149fb (git)
Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < abcd48ecdeb2e12eccb8339a35534c757782afcd (git)
Affected: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 , < 168ff39e4758897d2eee4756977d036d52884c7e (git)
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    Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc3 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_core.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\n\nWhen booting with the \u0027ipv6.disable=1\u0027 parameter, the nd_tbl is never\ninitialized because inet6_init() exits before ndisc_init() is called\nwhich initializes it. If an IPv6 packet is injected into the interface,\nroute_shortcircuit() is called and a NULL pointer dereference happens on\nneigh_lookup().\n\n BUG: kernel NULL pointer dereference, address: 0000000000000380\n Oops: Oops: 0000 [#1] SMP NOPTI\n [...]\n RIP: 0010:neigh_lookup+0x20/0x270\n [...]\n Call Trace:\n  \u003cTASK\u003e\n  vxlan_xmit+0x638/0x1ef0 [vxlan]\n  dev_hard_start_xmit+0x9e/0x2e0\n  __dev_queue_xmit+0xbee/0x14e0\n  packet_sendmsg+0x116f/0x1930\n  __sys_sendto+0x1f5/0x200\n  __x64_sys_sendto+0x24/0x30\n  do_syscall_64+0x12f/0x1590\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFix this by adding an early check on route_shortcircuit() when protocol\nis ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because\nVXLAN can be built-in even when IPv6 is built as a module."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:26:51.160Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23293",
    "datePublished": "2026-03-25T10:26:51.160Z",
    "dateReserved": "2026-01-13T15:37:45.993Z",
    "dateUpdated": "2026-03-25T10:26:51.160Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23293\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:24.520\",\"lastModified\":\"2026-03-25T15:41:33.977\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled\\n\\nWhen booting with the \u0027ipv6.disable=1\u0027 parameter, the nd_tbl is never\\ninitialized because inet6_init() exits before ndisc_init() is called\\nwhich initializes it. If an IPv6 packet is injected into the interface,\\nroute_shortcircuit() is called and a NULL pointer dereference happens on\\nneigh_lookup().\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000380\\n Oops: Oops: 0000 [#1] SMP NOPTI\\n [...]\\n RIP: 0010:neigh_lookup+0x20/0x270\\n [...]\\n Call Trace:\\n  \u003cTASK\u003e\\n  vxlan_xmit+0x638/0x1ef0 [vxlan]\\n  dev_hard_start_xmit+0x9e/0x2e0\\n  __dev_queue_xmit+0xbee/0x14e0\\n  packet_sendmsg+0x116f/0x1930\\n  __sys_sendto+0x1f5/0x200\\n  __x64_sys_sendto+0x24/0x30\\n  do_syscall_64+0x12f/0x1590\\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nFix this by adding an early check on route_shortcircuit() when protocol\\nis ETH_P_IPV6. Note that ipv6_mod_enabled() cannot be used here because\\nVXLAN can be built-in even when IPv6 is built as a module.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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