{"apiVersion":"1.0","identifier":"CVE-2026-99284","description":"In the Linux kernel, the following vulnerability has been resolved: net: skbuff: propagate shared-frag marker in skb_zerocopy() skb_zerocopy() moves frag descriptors from @from into @to and takes a reference on each frag, but it does not copy skb_shinfo(from)->flags into skb_shinfo(to)->flags. A destination skb holding the same page-cache backed frags as the source therefore reports skb_has_shared_frag() as false. That breaks the invariant relied on by later in-place writers. ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(); with the marker lost, an skb that skb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is decrypted in place, letting an unprivileged user write into the page cache of a root-owned read-only file. Propagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for the other frag-transfer helpers.","publishedAt":"2026-11-07T21:17:00","lastModifiedAt":"2026-11-10T19:22:31","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-99284","cvssScore":null,"cvssVector":null,"epssProbability":0.00209,"riskScore":null,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-99284","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-99284","en":"https://www.redsauce.net/en/cves/CVE-2026-99284","fr":"https://www.redsauce.net/fr/cves/CVE-2026-99284","pt":"https://www.redsauce.net/pt/cves/CVE-2026-99284","de":"https://www.redsauce.net/de/cves/CVE-2026-99284","sk":"https://www.redsauce.net/sk/cves/CVE-2026-99284","el":"https://www.redsauce.net/el/cves/CVE-2026-99284"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-99284"}}