CVE-2026-23293 (GCVE-0-2026-23293)
Vulnerability from cvelistv5
Published
2026-03-25 10:26
Modified
2026-04-18 08:57
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 Version: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 Version: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 Version: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 Version: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 Version: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 Version: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 Version: e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/net/vxlan/vxlan_core.c"
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"version": "3.12"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver"
},
{
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"version": "6.6.130",
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},
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"version": "6.12.77",
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},
{
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"status": "unaffected",
"version": "6.18.17",
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},
{
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"status": "unaffected",
"version": "6.19.7",
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},
{
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"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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],
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"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-18T08:57:43.516Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0"
},
{
"url": "https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc"
},
{
"url": "https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45"
},
{
"url": "https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434"
},
{
"url": "https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7"
},
{
"url": "https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb"
},
{
"url": "https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd"
},
{
"url": "https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e"
}
],
"title": "net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-23293",
"datePublished": "2026-03-25T10:26:51.160Z",
"dateReserved": "2026-01-13T15:37:45.993Z",
"dateUpdated": "2026-04-18T08:57:43.516Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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