net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled
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: 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.
CVE-2026-23293
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-23293
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945",
"lessThan": "649e2bb74da54c96cf20729001e283626a2fefa0",
"versionType": "git"
},
{
"status": "affected",
"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945",
"lessThan": "dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc",
"versionType": "git"
},
{
"status": "affected",
"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945",
"lessThan": "b5190fcd75a1f1785c766a8d1e44d3938e168f45",
"versionType": "git"
},
{
"status": "affected",
"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945",
"lessThan": "5f93e6b4d12bd3a4517a6d447ea675f448f21434",
"versionType": "git"
},
{
"status": "affected",
"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945",
"lessThan": "f0373e9317bc904e7bdb123d3106fe4f3cea2fb7",
"versionType": "git"
},
{
"status": "affected",
"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945",
"lessThan": "fbbd2118982c55fb9b0a753ae0cf7194e77149fb",
"versionType": "git"
},
{
"status": "affected",
"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945",
"lessThan": "abcd48ecdeb2e12eccb8339a35534c757782afcd",
"versionType": "git"
},
{
"status": "affected",
"version": "e15a00aafa4b7953ad717d3cb1ad7acf4ff76945",
"lessThan": "168ff39e4758897d2eee4756977d036d52884c7e",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/vxlan/vxlan_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.77",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.17",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.7",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/vxlan/vxlan_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23293
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27216 · Revision 1
- Added to Heist Feed
- Publisher date