{"id":"CVE-2026-80977","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-80977","summary":"net: skbuff: don't touch shared zerocopy state in skb_tx_error()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: don't touch shared zerocopy state in skb_tx_error()\n\nskb_tx_error() completes the zerocopy uarg and clears\nSKBFL_ALL_ZEROCOPY, and skb_zcopy_downgrade_managed() clears\nSKBFL_MANAGED_FRAG_REFS. Both live in skb_shinfo(), which every clone\nshares, while the caller only owns the reference it is about to drop.\nThrough a clone it tells the producer its pages are free and drops\nSKBFL_SHARED_FRAG for an skb that is still in flight.\n\nOpen vSwitch reaches this with a non-last OVS_ACTION_ATTR_RECIRC:\nclone_execute() sends a skb_clone() into ovs_dp_process_packet() while\ndo_execute_actions() keeps forwarding the original, and skb_clone()\ndoes not privatise the frags here -- skb_orphan_frags() returns early\non SKBFL_DONT_ORPHAN. A flow miss on the clone then strips the marker\nfrom the packet still being forwarded, and a later local ESP delivery\ndecrypts in place over frags it does not own privately.\n\nSkip it for a cloned skb. Nothing is lost: skb_release_data() clears\nthe zerocopy state once the last reference to the shared data goes.","published":"2026-09-11T19:42:38.862Z","modified":"2026-09-14T03:45:47.650411460Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.109"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0370da114a9bc044e248b85c6809d1b5e0c1f7f9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/15aa81b390d401abf4b8211042470e9e92e3b7fb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/288f9970670841044ab030104fa6b6ed159949d0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80977.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80977"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-14T03:45:47.650411460Z"}}