Answer in brief
CVE-2026-23293 records a Medium severity (CVSS 5.5) vulnerability in net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-23293 records a Medium severity (CVSS 5.5) vulnerability in net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <649e2bb74da54c96cf20729001e283626a2fefa0 || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <b5190fcd75a1f1785c766a8d1e44d3938e168f45 || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <5f93e6b4d12bd3a4517a6d447ea675f448f21434 || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <f0373e9317bc904e7bdb123d3106fe4f3cea2fb7 || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <fbbd2118982c55fb9b0a753ae0cf7194e77149fb || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <abcd48ecdeb2e12eccb8339a35534c757782afcd || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <168ff39e4758897d2eee4756977d036d52884c7e | 649e2bb74da54c96cf20729001e283626a2fefa0, dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc, b5190fcd75a1f1785c766a8d1e44d3938e168f45, 5f93e6b4d12bd3a4517a6d447ea675f448f21434, f0373e9317bc904e7bdb123d3106fe4f3cea2fb7, fbbd2118982c55fb9b0a753ae0cf7194e77149fb, abcd48ecdeb2e12eccb8339a35534c757782afcd, 168ff39e4758897d2eee4756977d036d52884c7e |
| Linux/Linuxgeneric | 3.12 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Mar 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <649e2bb74da54c96cf20729001e283626a2fefa0 || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <b5190fcd75a1f1785c766a8d1e44d3938e168f45 || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <5f93e6b4d12bd3a4517a6d447ea675f448f21434 || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <f0373e9317bc904e7bdb123d3106fe4f3cea2fb7 || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <fbbd2118982c55fb9b0a753ae0cf7194e77149fb || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <abcd48ecdeb2e12eccb8339a35534c757782afcd || >=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <168ff39e4758897d2eee4756977d036d52884c7e | 649e2bb74da54c96cf20729001e283626a2fefa0, dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc, b5190fcd75a1f1785c766a8d1e44d3938e168f45, 5f93e6b4d12bd3a4517a6d447ea675f448f21434, f0373e9317bc904e7bdb123d3106fe4f3cea2fb7, fbbd2118982c55fb9b0a753ae0cf7194e77149fb, abcd48ecdeb2e12eccb8339a35534c757782afcd, 168ff39e4758897d2eee4756977d036d52884c7e |
| Linux/Linuxgeneric | 3.12 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Mar 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.