CVE-2025-21954
netmem: prevent TX of unreadable skbs
We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.
Please see our statement on Data Privacy.
netmem: prevent TX of unreadable skbs
In the Linux kernel, the following vulnerability has been resolved: netmem: prevent TX of unreadable skbs Currently on stable trees we have support for netmem/devmem RX but not TX. It is not safe to forward/redirect an RX unreadable netmem packet into the device's TX path, as the device may call dma-mapping APIs on dma addrs that should not be passed to it. Fix this by preventing the xmit of unreadable skbs. Tested by configuring tc redirect: sudo tc qdisc add dev eth1 ingress sudo tc filter add dev eth1 ingress protocol ip prio 1 flower ip_proto \ tcp src_ip 192.168.1.12 action mirred egress redirect dev eth1 Before, I see unreadable skbs in the driver's TX path passed to dma mapping APIs. After, I don't see unreadable skbs in the driver's TX path passed to dma mapping APIs.
Reserved 2024-12-29 | Published 2025-04-01 | Updated 2025-05-04 | Assigner Linuxgit.kernel.org/...c/454825019d2f0c59e5174ece9e713f45ad80beff
git.kernel.org/...c/1c17c8ced25c5fbe424c7ad7ea11d33014a986b1
git.kernel.org/...c/f3600c867c99a2cc8038680ecf211089c50e7971
Support options
