CVE-2026-99284

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: skbuff: propagate shared-frag marker in skb_zerocopy()<br /> <br /> skb_zerocopy() moves frag descriptors from @from into @to and takes a<br /> reference on each frag, but it does not copy skb_shinfo(from)-&gt;flags into<br /> skb_shinfo(to)-&gt;flags. A destination skb holding the same page-cache<br /> backed frags as the source therefore reports skb_has_shared_frag() as<br /> false.<br /> <br /> That breaks the invariant relied on by later in-place writers. ESP input<br /> checks skb_has_shared_frag() before deciding whether an uncloned<br /> nonlinear skb can skip skb_cow_data(); with the marker lost, an skb that<br /> skb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is<br /> decrypted in place, letting an unprivileged user write into the page<br /> cache of a root-owned read-only file.<br /> <br /> Propagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for<br /> the other frag-transfer helpers.