Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: fix NULL pointer dereference in l3mdev_l3_rcv When delete l3s ipvlan: ip link del link eth0 ipvlan1 type ipvlan mode l3s This may cause a null pointer dereference: Call trace: ip_rcv_finish+0x48/0xd0 ip_rcv+0x5c/0x100 __netif_receive_skb_one_core+0x64/0xb0 __netif_receive_skb+0x20/0x80 process_backlog+0xb4/0x204 napi_poll+0xe8/0x294 net_rx_action+0xd8/0x22c __do_softirq+0x12c/0x354 This is because l3mdev_l3_rcv() visit dev->l3mdev_ops after ipvlan_l3s_unregister() assign the dev->l3mdev_ops to NULL. The process like this: (CPU1) | (CPU2) l3mdev_l3_rcv() | check dev->priv_flags: | master = skb->dev; | | | ipvlan_l3s_unregister() | set dev->priv_flags | dev->l3mdev_ops = NULL; | visit master->l3mdev_ops | To avoid this by do not set dev->l3mdev_ops when unregister l3s ipvlan.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c675e06a98a474f7ad0af32ce467613da818da52 before 1da52878f7fb74ace304f74325bb89e3e5546b55; affected c675e06a98a474f7ad0af32ce467613da818da52 before d97d6b1bd2b7f2a188d261d44c4519a13b8c406a; affected c675e06a98a474f7ad0af32ce467613da818da52 before 8da4d7f9141e8dbd3ece2f0e6930a0ea8812c862; affected c675e06a98a474f7ad0af32ce467613da818da52 before 52b44d8c653459c658b733d13658afdde45f6836; affected c675e06a98a474f7ad0af32ce467613da818da52 before 59599bce44af3df7a215ebc81cb166426e1c9204; affected c675e06a98a474f7ad0af32ce467613da818da52 before f9dff65140efc289f01bcf39c3ca66a8806b6132; affected c675e06a98a474f7ad0af32ce467613da818da52 before 0032c99e83b9ce6d5995d65900aa4b6ffb501cce |
| Linux / Linux | affected 5.1; unaffected 0 before 5.1; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.117 through 6.6.*; unaffected 6.12.46 through 6.12.*; unaffected 6.14.2 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1da52878f7fb74ace304f74325bb89e3e5546b55
- https://git.kernel.org/stable/c/d97d6b1bd2b7f2a188d261d44c4519a13b8c406a
- https://git.kernel.org/stable/c/8da4d7f9141e8dbd3ece2f0e6930a0ea8812c862
- https://git.kernel.org/stable/c/52b44d8c653459c658b733d13658afdde45f6836
- https://git.kernel.org/stable/c/59599bce44af3df7a215ebc81cb166426e1c9204
- https://git.kernel.org/stable/c/f9dff65140efc289f01bcf39c3ca66a8806b6132
- https://git.kernel.org/stable/c/0032c99e83b9ce6d5995d65900aa4b6ffb501cce