Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: tap: set skb->dev before parsing virtio net header in tap_get_user_xdp() The commit 4f61f133f354 ("net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null") fixed a crash in tap_get_user() by assigning skb->dev before calling tun_vnet_hdr_to_skb(). This is required because virtio_net_hdr_to_skb() may invoke dev_parse_header_protocol(), which dereferences skb->dev. Without the assignment, a NULL pointer dereference can occur. However, tap_get_user_xdp() still parses the virtio-net header before assigning skb->dev. When the vhost TX path passes an XDP buffer containing a GSO virtio-net header but the protocol is set to zero on purpose, tun_vnet_hdr_to_skb() can reach dev_parse_header_protocol() while skb->dev is still NULL, resulting in a crash. Fix this by looking up the tap device and assigning skb->dev before calling tun_vnet_hdr_to_skb(), matching the ordering already used in tap_get_user(). Preserve the existing RCU read-side critical section across dev_queue_xmit().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 924a9bc362a5223cd448ca08c3dde21235adc310 before 61dd022c55c7307ec119e5672cb141cccbecf3b1; affected 924a9bc362a5223cd448ca08c3dde21235adc310 before 15583b07fd691a844fbf7b3ad612cdc9e9a657c0; affected 924a9bc362a5223cd448ca08c3dde21235adc310 before 8b444b126cd8e4473e652f529753ed4dd1360a9c; affected 924a9bc362a5223cd448ca08c3dde21235adc310 before 164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b; affected 924a9bc362a5223cd448ca08c3dde21235adc310 before 3874892dd27d5387aa9a06f58d9060f18f351d24; affected ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d; affected 54ef8243c3c8e90f1ea5792e6752e021a25c8eb3; affected ca278267d6cd9544645731732455b6b20cb0e895; affected faa3baa2828c5e1c4374f3e60041f75c64f5fcb6; affected 99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748; affected 4.14.226 before 4.15; affected 4.19.181 before 4.20; affected 5.4.106 before 5.5; affected 5.10.24 before 5.11; affected 5.11.7 before 5.12 |
| Linux / Linux | affected 5.12; unaffected 0 before 5.12; unaffected 6.6.160 through 6.6.*; unaffected 6.12.105 through 6.12.*; unaffected 6.18.45 through 6.18.*; unaffected 7.1.9 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/61dd022c55c7307ec119e5672cb141cccbecf3b1
- https://git.kernel.org/stable/c/15583b07fd691a844fbf7b3ad612cdc9e9a657c0
- https://git.kernel.org/stable/c/8b444b126cd8e4473e652f529753ed4dd1360a9c
- https://git.kernel.org/stable/c/164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b
- https://git.kernel.org/stable/c/3874892dd27d5387aa9a06f58d9060f18f351d24
ADP enrichment
No English description supplied.
No references supplied.