{"id":"CVE-2026-63970","revision":"01e458f91ab74068b23b466518f33c00","records":[{"revision":"01e458f91ab74068b23b466518f33c00","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63970","aliases":[],"title":"vsock/virtio: bind uarg before filling zerocopy skb","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: bind uarg before filling zerocopy skb\n\nvirtio_transport_send_pkt_info() allocates or reuses the zerocopy uarg\nbefore entering the send loop, but virtio_transport_alloc_skb() still\nfills the skb before it inherits that uarg. When fixed-buffer vectored\nzerocopy hits MAX_SKB_FRAGS, io_sg_from_iter() may partially attach\nmanaged frags and return -EMSGSIZE. The rollback path call kfree_skb()\nto free an skb that carries SKBFL_MANAGED_FRAG_REFS but no uarg, so\nskb_release_data() falls through to ordinary frag unref.\n\nPass the uarg into virtio_transport_alloc_skb() and bind it immediately\nbefore virtio_transport_fill_skb(). This keeps control or no-payload skbs\nuntouched while ensuring success and rollback share one lifetime rule.","state":0,"publishedAt":"2026-07-19T14:55:57.067+00:00","modifiedAt":"2026-10-19T20:17:59.302+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/vmw_vsock/virtio_transport_common.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"581512a6dc939ef122e49336626ae159f3b8a345\",\n                            \"lessThan\": \"72194f65050958e4c8e069adb6c5d89ef81ca197\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"581512a6dc939ef122e49336626ae159f3b8a345\",\n                            \"lessThan\": \"b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"581512a6dc939ef122e49336626ae159f3b8a345\",\n                            \"lessThan\": \"5d317573f1d48e76cce5fb6250452b6e4102e0fb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"581512a6dc939ef122e49336626ae159f3b8a345\",\n                            \"lessThan\": \"1e584c304cfb94a759417130b1fc6d30b30c4cce\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/vmw_vsock/virtio_transport_common.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.35\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.12\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/72194f65050958e4c8e069adb6c5d89ef81ca197","https://git.kernel.org/stable/c/b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d","https://git.kernel.org/stable/c/5d317573f1d48e76cce5fb6250452b6e4102e0fb","https://git.kernel.org/stable/c/1e584c304cfb94a759417130b1fc6d30b30c4cce"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63970","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63970","identifiers":["CVE-2026-63970"]},"retained":false,"historicalAffected":[]}],"coverage":[]}