{"id":"CVE-2026-99122","title":"vsock/vmci: validate packet source for connected sockets","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/vmci: validate packet source for connected sockets\n\nvmci_transport_recv_stream_cb() looks up sockets first by the full source\nand destination tuple, then by desti…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= d021c344051af91f42c5ba9fdedc176740cbd238 < c027f8b429dbb2157fc1b503df196e272d947c89","Linux >= d021c344051af91f42c5ba9fdedc176740cbd238 < 90c423b62ec9be08177f74b07a47937ca8d2035b","Linux >= d021c344051af91f42c5ba9fdedc176740cbd238 < ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7","Linux 3.9"],"published":"2026-10-28","updated":"2026-10-31","sourceUpdated":"2026-10-31T12:43:23.512Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99122","references":[{"url":"https://git.kernel.org/stable/c/c027f8b429dbb2157fc1b503df196e272d947c89"},{"url":"https://git.kernel.org/stable/c/90c423b62ec9be08177f74b07a47937ca8d2035b"},{"url":"https://git.kernel.org/stable/c/ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7"}],"tags":["cve.org"],"epss":0.0012,"epssPercentile":0.01847,"ingestedAt":"2026-10-28T11:09:40.443Z","slug":"CVE-2026-99122","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nvsock/vmci: validate packet source for connected sockets\n\nvmci_transport_recv_stream_cb() looks up sockets first by the full source\nand destination tuple, then by destination only in the bound table. The\nfallback can select a non-listening socket without checking whether the\npacket came from its stored peer.\n\nThis was reproduced with two VMCI contexts. A RST from the context not\nstored in a TCP_SYN_SENT socket reset that socket after it was selected by\nthe destination-only lookup.\n\nVMCI can process notification packets in bottom-half context when the\nsocket is not owned by user context, or defer packets to a workqueue. Use\nvsock_check_source() after taking the socket lock in the bottom-half path,\nand recheck after lock_sock() in the workqueue path. Listening sockets\ncontinue to accept packets from any source.\n\nReply with a RST addressed from the received packet before dropping a\nsource that fails validation. This preserves the existing reset behavior\nfor bound non-listening and concurrently closed sockets without directing\nthe reset to a connected socket's stored peer.\n\n## Affected\n\n- `Linux >= d021c344051af91f42c5ba9fdedc176740cbd238 < c027f8b429dbb2157fc1b503df196e272d947c89`\n- `Linux >= d021c344051af91f42c5ba9fdedc176740cbd238 < 90c423b62ec9be08177f74b07a47937ca8d2035b`\n- `Linux >= d021c344051af91f42c5ba9fdedc176740cbd238 < ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7`\n- `Linux 3.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":233308,"id":"CVE-2026-99122","ts":1793896011871,"field":"cvss","old":null,"new":"7.3"},{"seq":233307,"id":"CVE-2026-99122","ts":1793896011871,"field":"severity","old":"none","new":"high"}]}