Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netlink: reset skb headers before unicast and multicast filtering Socket filters can use SKF_NET_OFF and SKF_LL_OFF to read relative to an skb's network and MAC headers. Netlink producers may reserve headroom without resetting those headers, allowing a receiving socket's filter to read data before the initialized message. For example, IWPM HELLO replies are allocated with dev_alloc_skb(), which reserves NET_SKB_PAD bytes. An unprivileged NETLINK_RDMA user can attach a classic socket filter and disclose this headroom through the length of the delivered reply. The resets in netlink_dump() do not help because IWPM sends a separately allocated skb through netlink_unicast(). Reset both headers before running the receiver's filter in unicast and broadcast delivery, as is already done for dump skbs. This also covers other netlink producers that reserve headroom without changing their allocation or message-building code.
References
- https://git.kernel.org/stable/c/06791594274f87c29f1a9f1961d700272716a49d
- https://git.kernel.org/stable/c/06935da5de83aa8b98841563894857e7d2f80e47
- https://git.kernel.org/stable/c/4123f8d2099863e2421187af9d87b45e8eebd867
- https://git.kernel.org/stable/c/6ec7cc02458c6a1509377a7f2eec9c7b1a355b5e
- https://git.kernel.org/stable/c/8bf659bd54e1f00e34cf5244b1d289c506fa47c0
- https://git.kernel.org/stable/c/c69db9e1f5cf886d4e3011313761a0f63a1d0da0
- https://git.kernel.org/stable/c/ea0e0fc4c72f71bd6d8bf460bfe309b61c35b548
FAQ
What is CVE-2026-99211?
CVE-2026-99211 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: netlink: reset skb headers before unicast and multicast filtering Socket filters can use SKF_NET_OFF and SKF_LL_OFF to read relati...
How severe is CVE-2026-99211?
CVSS scoring is not yet available for CVE-2026-99211. Check NVD for updates.
Is there a patch for CVE-2026-99211?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.