CVE-2026-99122

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99122", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.393Z", "datePublished": "2026-10-28T10:34:37.859Z", "dateUpdated": "2026-11-10T18:15:25.472Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-10T18:15:25.472Z"}, "descriptions": [{"lang": "en", "value": "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 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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - A local VMCI endpoint supplies the forged control datagram through IOCTL_VMCI_DATAGRAM_SEND, reaching vmci_datagram_dispatch() and the patched vmci_transport_recv_stream_cb(); vsock is therefore Local rather than a routable network vector.\nAC:L - vsock_diag_dump() exposes socket CIDs, ports, and state without an authorization check, after which a chosen RST deterministically misses vsock_find_connected_socket() and reaches the victim through vsock_find_bound_socket(); no race or uncontrolled condition is required.\nPR:L - vmci_host_open(), IOCTL_VMCI_INIT_CONTEXT, and IOCTL_VMCI_DATAGRAM_SEND contain no capability check, allowing a low-privilege VMX/local process with ordinary VMCI-device access to create an unrestricted context and submit the packet.\nUI:N - After the victim process has an ordinary bound connecting or established socket, the attacker's datagram alone drives vmci_transport_recv_pkt_work() and the reset handler; no victim user action is required.\nS:C - A packet owned by an attacker-controlled guest/VMX VMCI context is applied to a host-context socket by vmci_transport_recv_connecting_client() or vmci_transport_recv_connected(), crossing the VMCI virtualization or VMM-sandbox boundary.\nC:L - On an established socket, a forged WAITING_READ reaches vmci_transport_handle_waiting_read(), which conditionally returns WROTE to the foreign source based on vmci_qpair_produce_buf_ready(); this exposes limited queue-occupancy and traffic-state information, not payload bytes.\nI:N - The demonstrated RST and forged notification paths do not write application payloads, alter the intended VMCI queue pair, or corrupt memory; their changes to sk_state, peer_shutdown, and notification flags implement connection disruption rather than data modification.\nA:H - vmci_transport_recv_connecting_client() sets TCP_CLOSE and ECONNRESET, while vmci_transport_recv_connected() sets SOCK_DONE, SHUTDOWN_MASK, and TCP_CLOSING. Because tuples can be re-enumerated and RST injection repeated, the attacker can continuously terminate targeted VMCI client connections and fully deny their service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/vmw_vsock/vmci_transport.c"], "versions": [{"version": "d021c344051af91f42c5ba9fdedc176740cbd238", "lessThan": "cdd1f99eaa4d4db82d506eb50e724460671c7cac", "status": "affected", "versionType": "git"}, {"version": "d021c344051af91f42c5ba9fdedc176740cbd238", "lessThan": "c027f8b429dbb2157fc1b503df196e272d947c89", "status": "affected", "versionType": "git"}, {"version": "d021c344051af91f42c5ba9fdedc176740cbd238", "lessThan": "90c423b62ec9be08177f74b07a47937ca8d2035b", "status": "affected", "versionType": "git"}, {"version": "d021c344051af91f42c5ba9fdedc176740cbd238", "lessThan": "ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/vmw_vsock/vmci_transport.c"], "versions": [{"version": "3.9", "status": "affected"}, {"version": "0", "lessThan": "3.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.117", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.13", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.12.117"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.18.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "7.2.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/cdd1f99eaa4d4db82d506eb50e724460671c7cac"}, {"url": "https://git.kernel.org/stable/c/c027f8b429dbb2157fc1b503df196e272d947c89"}, {"url": "https://git.kernel.org/stable/c/90c423b62ec9be08177f74b07a47937ca8d2035b"}, {"url": "https://git.kernel.org/stable/c/ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7"}], "title": "vsock/vmci: validate packet source for connected sockets", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/vmw_vsock/vmci_transport.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cdd1f99eaa4d4db82d506eb50e724460671c7cac", "status": "affected", "version": "d021c344051af91f42c5ba9fdedc176740cbd238", "versionType": "git"}, {"lessThan": "c027f8b429dbb2157fc1b503df196e272d947c89", "status": "affected", "version": "d021c344051af91f42c5ba9fdedc176740cbd238", "versionType": "git"}, {"lessThan": "90c423b62ec9be08177f74b07a47937ca8d2035b", "status": "affected", "version": "d021c344051af91f42c5ba9fdedc176740cbd238", "versionType": "git"}, {"lessThan": "ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7", "status": "affected", "version": "d021c344051af91f42c5ba9fdedc176740cbd238", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/vmw_vsock/vmci_transport.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.9"}, {"lessThan": "3.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.117", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.59", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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 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."}], "id": "CVE-2026-99122", "lastModified": "2026-11-10T19:22:30.593", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 4.7, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-10-28T11:17:31.847", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/90c423b62ec9be08177f74b07a47937ca8d2035b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c027f8b429dbb2157fc1b503df196e272d947c89"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cdd1f99eaa4d4db82d506eb50e724460671c7cac"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of Service via unvalidated packet source in VMCI sockets", "id": "2562709", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562709"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-346", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvsock/vmci: validate packet source for connected sockets\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.\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.\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.\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.", "A flaw was found in the Linux kernel. This flaw allows a Denial of Service (DoS) due to missing source validation in the Virtual Machine Communication Interface (VMCI) socket implementation. When handling incoming stream packets, the kernel can assign traffic to a connected socket without verifying that it originated from the expected peer. An attacker in a separate VMCI context can exploit this issue by sending reset packets to prematurely terminate active socket connections."], "name": "CVE-2026-99122", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-28T10:34:37Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99122\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99122\nhttps://git.kernel.org/stable/c/90c423b62ec9be08177f74b07a47937ca8d2035b\nhttps://git.kernel.org/stable/c/ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7\nhttps://git.kernel.org/stable/c/c027f8b429dbb2157fc1b503df196e272d947c89"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d021c344051af91f42c5ba9fdedc176740cbd238,c027f8b429dbb2157fc1b503df196e272d947c89)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d021c344051af91f42c5ba9fdedc176740cbd238,90c423b62ec9be08177f74b07a47937ca8d2035b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d021c344051af91f42c5ba9fdedc176740cbd238,ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.59,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.13,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d021c344051af91f42c5ba9fdedc176740cbd238,c027f8b429dbb2157fc1b503df196e272d947c89)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d021c344051af91f42c5ba9fdedc176740cbd238,90c423b62ec9be08177f74b07a47937ca8d2035b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d021c344051af91f42c5ba9fdedc176740cbd238,ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.59,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.13,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-28T12:00:22.513735+00:00", "updated": "2026-10-31T15:30:15.276208+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}