Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before 649e2bb74da54c96cf20729001e283626a2fefa0; affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc; affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before b5190fcd75a1f1785c766a8d1e44d3938e168f45; affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before 5f93e6b4d12bd3a4517a6d447ea675f448f21434; affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before f0373e9317bc904e7bdb123d3106fe4f3cea2fb7; affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before fbbd2118982c55fb9b0a753ae0cf7194e77149fb; affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before abcd48ecdeb2e12eccb8339a35534c757782afcd; affected e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 before 168ff39e4758897d2eee4756977d036d52884c7e |
| Linux / Linux | affected 3.12; unaffected 0 before 3.12; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.167 through 6.1.*; unaffected 6.6.130 through 6.6.*; unaffected 6.12.77 through 6.12.*; unaffected 6.18.17 through 6.18.*; unaffected 6.19.7 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/649e2bb74da54c96cf20729001e283626a2fefa0
- https://git.kernel.org/stable/c/dc3e62cf3bbf66280a907ec379f373d0c3b8b2bc
- https://git.kernel.org/stable/c/b5190fcd75a1f1785c766a8d1e44d3938e168f45
- https://git.kernel.org/stable/c/5f93e6b4d12bd3a4517a6d447ea675f448f21434
- https://git.kernel.org/stable/c/f0373e9317bc904e7bdb123d3106fe4f3cea2fb7
- https://git.kernel.org/stable/c/fbbd2118982c55fb9b0a753ae0cf7194e77149fb
- https://git.kernel.org/stable/c/abcd48ecdeb2e12eccb8339a35534c757782afcd
- https://git.kernel.org/stable/c/168ff39e4758897d2eee4756977d036d52884c7e
ADP enrichment
No English description supplied.