Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: bridge: fix vlan tunnel dst null pointer dereference This patch fixes a tunnel_dst null pointer dereference due to lockless access in the tunnel egress path. When deleting a vlan tunnel the tunnel_dst pointer is set to NULL without waiting a grace period (i.e. while it's still usable) and packets egressing are dereferencing it without checking. Use READ/WRITE_ONCE to annotate the lockless use of tunnel_id, use RCU for accessing tunnel_dst and make sure it is read only once and checked in the egress path. The dst is already properly RCU protected so we don't need to do anything fancy than to make sure tunnel_id and tunnel_dst are read only once and checked in the egress path.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd before ad7feefe7164892db424c45687472db803d87f79; affected 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd before 24a6e55f17aa123bc1fc54b7d3c410b41bc16530; affected 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd before a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c; affected 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd before fe0448a3fad365a747283a00a1d1ad5e8d6675b7; affected 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd before abb02e05cb1c0a30dd873a29f33bc092067dc35d; affected 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd before 58e2071742e38f29f051b709a5cca014ba51166f |
| Linux / Linux | affected 4.11; unaffected 0 before 4.11; unaffected 4.14.238 through 4.14.*; unaffected 4.19.196 through 4.19.*; unaffected 5.4.128 through 5.4.*; unaffected 5.10.46 through 5.10.*; unaffected 5.12.13 through 5.12.*; unaffected 5.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79
- https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530
- https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c
- https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7
- https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35d
- https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166f
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.
- https://git.kernel.org/stable/c/ad7feefe7164892db424c45687472db803d87f79
- https://git.kernel.org/stable/c/24a6e55f17aa123bc1fc54b7d3c410b41bc16530
- https://git.kernel.org/stable/c/a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c
- https://git.kernel.org/stable/c/fe0448a3fad365a747283a00a1d1ad5e8d6675b7
- https://git.kernel.org/stable/c/abb02e05cb1c0a30dd873a29f33bc092067dc35d
- https://git.kernel.org/stable/c/58e2071742e38f29f051b709a5cca014ba51166f