The skbs processed by ip_cmsg_recv() are not guaranteed to be linear e.g. when sending UDP packets over loopback with MSGMORE. Using csum_partial() on [potentially] the whole skb len is dangerous; instead be on the safe side and use skb_checksum(). Upstream patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32 References: http://seclists.org/oss-sec/2017/q1/525
kernel-4.9.13-100.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Statement: This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 4,5,6,7 and MRG-2.
Upstream patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32 CVE-Request: http://seclists.org/oss-sec/2017/q1/525
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1442927]
This was fixed upstream in 4.10.1. The fix was pushed to Fedora 25 with the 4.10.5 rebase on 3-27 and in Fedora 24 with the 4.10.6 rebase on 4-01.