CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, без вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
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().
Засегнати продукти
- Linux Linux: 924a9bc362a5223cd448ca08c3dde21235adc310 преди 1d022885f3e6e0e238815391a4afaf3a4fb0a442; 924a9bc362a5223cd448ca08c3dde21235adc310 преди 61dd022c55c7307ec119e5672cb141cccbecf3b1; 924a9bc362a5223cd448ca08c3dde21235adc310 преди 15583b07fd691a844fbf7b3ad612cdc9e9a657c0; 924a9bc362a5223cd448ca08c3dde21235adc310 преди 8b444b126cd8e4473e652f529753ed4dd1360a9c; 924a9bc362a5223cd448ca08c3dde21235adc310 преди 164c31ee252ebd1ac8f44c2dfc5486b6d9a0379b; 924a9bc362a5223cd448ca08c3dde21235adc310 преди 3874892dd27d5387aa9a06f58d9060f18f351d24; ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d; 54ef8243c3c8e90f1ea5792e6752e021a25c8eb3; ca278267d6cd9544645731732455b6b20cb0e895; faa3baa2828c5e1c4374f3e60041f75c64f5fcb6; 99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748; 4.14.226 преди 4.15; 4.19.181 преди 4.20; 5.4.106 преди 5.5; 5.10.24 преди 5.11; 5.11.7 преди 5.12
- Linux Linux: 5.12; преди 5.12; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.105 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; от 7.2 нататък
История
- 22 август 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-74684
- https://nvd.nist.gov/vuln/detail/CVE-2026-74684
- https://git.kernel.org/stable/c/1d022885f3e6e0e238815391a4afaf3a4fb0a442
- 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