{"apiVersion":"1.0","identifier":"CVE-2026-80615","description":"In the Linux kernel, the following vulnerability has been resolved: net: dst_metadata: fix false-positive memcpy overflow in tun_dst_unclone kmalloc_flex() in metadata_dst_alloc() sets __counted_by for the structure to the options_len, which is then initialized to zero. Later, we-re initializing the structure by copying the tunnel info together with the options, and this triggers a warning for a potential memcpy overflow, since the compiler estimates that the options can-t fit into the structure, even though the memory for them is actually allocated. memcpy: detected buffer overflow: 104 byte write of buffer size 96 WARNING: CPU: X PID: Y at lib/string_helpers.c:1036 __fortify_report skb_tunnel_info_unclone+0x179/0x190 geneve_xmit+0x7fe/0xe00 The issue is triggered when built with clang and source fortification. Fix that by doing the copy in two stages: first - the main data with the options_len, then the options. This way the correct length should be known at the time of the copy. It would be better if the options_len never changed after allocation, but the allocation code is a little separate from the initialization and it would be awkward and potentially dangerous to return a struct with options_len set to a non-zero value from the metadata_dst_alloc(). Another option would be to use ip_tunnel_info_opts_set(), but it is doing too many unnecessary operations for the use case here.","publishedAt":"2026-08-28T08:16:45","lastModifiedAt":"2026-08-28T08:16:45","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80615","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00171,"riskScore":0,"affectedProduct":"linux","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-80615","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-80615","en":"https://www.redsauce.net/en/cves/CVE-2026-80615","fr":"https://www.redsauce.net/fr/cves/CVE-2026-80615","pt":"https://www.redsauce.net/pt/cves/CVE-2026-80615","de":"https://www.redsauce.net/de/cves/CVE-2026-80615","sk":"https://www.redsauce.net/sk/cves/CVE-2026-80615","el":"https://www.redsauce.net/el/cves/CVE-2026-80615"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-80615"}}