Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: bridge: 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. Then, if neigh_suppress is enabled and an ICMPv6 Neighbor Discovery packet reaches the bridge, br_do_suppress_nd() will dereference ipv6_stub->nd_tbl which is NULL, passing it to neigh_lookup(). This causes a kernel NULL pointer dereference. BUG: kernel NULL pointer dereference, address: 0000000000000268 Oops: 0000 [#1] PREEMPT SMP NOPTI [...] RIP: 0010:neigh_lookup+0x16/0xe0 [...] Call Trace: <IRQ> ? neigh_lookup+0x16/0xe0 br_do_suppress_nd+0x160/0x290 [bridge] br_handle_frame_finish+0x500/0x620 [bridge] br_handle_frame+0x353/0x440 [bridge] __netif_receive_skb_core.constprop.0+0x298/0x1110 __netif_receive_skb_one_core+0x3d/0xa0 process_backlog+0xa0/0x140 __napi_poll+0x2c/0x170 net_rx_action+0x2c4/0x3a0 handle_softirqs+0xd0/0x270 do_softirq+0x3f/0x60 Fix this by replacing IS_ENABLED(IPV6) call with ipv6_mod_enabled() in the callers. This is in essence disabling NS/NA suppression when IPv6 is disabled.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ed842faeb2bd49256f00485402f3113205f91d30 before a9d712ccfeef737c0e700a4b5b98f310e07b6b60; affected ed842faeb2bd49256f00485402f3113205f91d30 before a5c56e65b685360dd3f2278aeff8c21061feb665; affected ed842faeb2bd49256f00485402f3113205f91d30 before 7a894eb5de246d79f13105c55a67381039a24d44; affected ed842faeb2bd49256f00485402f3113205f91d30 before a12cdaa3375f0bd3c8f4e564be7c143529abfe5b; affected ed842faeb2bd49256f00485402f3113205f91d30 before aa73deb3b6b730ec280d45b3f423bfa9e17bc122; affected ed842faeb2bd49256f00485402f3113205f91d30 before 33dec6f10777d5a8f71c0a200f690da5ae3c2e55; affected ed842faeb2bd49256f00485402f3113205f91d30 before 20ef5c25422f97dd09d751e5ae6c18406cdc78e6; affected ed842faeb2bd49256f00485402f3113205f91d30 before e5e890630533bdc15b26a34bb8e7ef539bdf1322 |
| Linux / Linux | affected 4.15; unaffected 0 before 4.15; 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/a9d712ccfeef737c0e700a4b5b98f310e07b6b60
- https://git.kernel.org/stable/c/a5c56e65b685360dd3f2278aeff8c21061feb665
- https://git.kernel.org/stable/c/7a894eb5de246d79f13105c55a67381039a24d44
- https://git.kernel.org/stable/c/a12cdaa3375f0bd3c8f4e564be7c143529abfe5b
- https://git.kernel.org/stable/c/aa73deb3b6b730ec280d45b3f423bfa9e17bc122
- https://git.kernel.org/stable/c/33dec6f10777d5a8f71c0a200f690da5ae3c2e55
- https://git.kernel.org/stable/c/20ef5c25422f97dd09d751e5ae6c18406cdc78e6
- https://git.kernel.org/stable/c/e5e890630533bdc15b26a34bb8e7ef539bdf1322
ADP enrichment
No English description supplied.