{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64475", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.791Z", "datePublished": "2026-07-25T08:51:38.154Z", "dateUpdated": "2026-08-05T12:42:23.772Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:42:23.772Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/pci: Release the VGA arbiter client on register_device() failure\n\nThe re-order in the Fixes commit below displaced vfio_pci_vga_init() as\nthe last failure point of what is now vfio_pci_core_register_device()\nwithout introducing an unwind for the VGA arbiter registration.\n\nIn current kernels this is mostly benign because vfio_pci_set_decode()\nonly uses pci_dev state, but the original failure path could leave a\ncallback with a freed vdev cookie. The stale registration also becomes\nunsafe again once the callback follows drvdata to the vfio device.\n\nAdd the required VGA unwind callout."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is triggered through local `/dev/vga_arbiter` operations or accesses to a delegated VFIO VGA region; it is not directly network-reachable. The VGA-arbiter character-device interface is documented in the [kernel documentation](https://docs.kernel.org/gpu/vgaarbiter.html).\nAC:L - Once failed VFIO registration leaves the stale callback, a single first-use VGA lock or legacy VGA access invokes it. No race must be won, and the attacker controls the triggering access.\nPR:L - The failed bind may arise from boot or privileged orchestration, but the subsequent callback path has no capability check and can be triggered by a video-group user, delegated VFIO process, or VM tenant. Real host-root privileges are therefore not required in a reasonable deployment.\nUI:N - The attacker directly performs the VGA-arbiter or VFIO-region access, with no victim action required during exploitation. Prior system configuration or automated device binding is not user interaction.\nS:C - With VFIO GPU passthrough, QEMU translates guest legacy-VGA accesses into VFIO `pread()` and `pwrite()` operations, allowing a guest to activate the stale host callback and potentially compromise the host kernel across the VM boundary, as shown by [QEMU\u2019s VFIO VGA implementation](https://gitlab.com/qemu-project/qemu/-/blob/e5b3a241 81ea0cebf1c5b20f44d016311b7048f0/hw/vfio/pci.c).\nC:H - Historical affected branches retain a callback cookie pointing to a freed `struct vfio_pci_device`; reclaiming that allocation can control its embedded `pdev` pointer and redirect kernel pointer dereferences. Under conservative UAF assessment, this can enable disclosure of arbitrary host memory.\nI:H - The dangling object and potentially stale module callback create exploitable memory-lifetime corruption that can be heap-shaped toward control-flow hijacking or arbitrary kernel modification. Successful exploitation can therefore execute code in the host kernel.\nA:H - An invalid reclaimed `pdev` or unloaded callback target can immediately produce a kernel page fault, oops, or panic. The trigger requires only one attacker-controlled VGA access after the stale registration exists."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/vfio/pci/vfio_pci_core.c"], "versions": [{"version": "87856f9af04eaacf9848710625a4ffee1d020fa9", "lessThan": "0f2a35a0c7ea7da347b814750eaa78adf3582381", "status": "affected", "versionType": "git"}, {"version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "lessThan": "8d65decde9afd2bd78bcfffdc0df73b82a0b5509", "status": "affected", "versionType": "git"}, {"version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "lessThan": "ef4c38d30b3744e89eb5048218904bb629ea8d47", "status": "affected", "versionType": "git"}, {"version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "lessThan": "9e0a3f642e607848669235f5069f35640abbfc88", "status": "affected", "versionType": "git"}, {"version": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/vfio/pci/vfio_pci_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0f2a35a0c7ea7da347b814750eaa78adf3582381", "status": "affected", "version": "87856f9af04eaacf9848710625a4ffee1d020fa9", "versionType": "git"}, {"lessThan": "8d65decde9afd2bd78bcfffdc0df73b82a0b5509", "status": "affected", "version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "versionType": "git"}, {"lessThan": "ef4c38d30b3744e89eb5048218904bb629ea8d47", "status": "affected", "version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "versionType": "git"}, {"lessThan": "9e0a3f642e607848669235f5069f35640abbfc88", "status": "affected", "version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "versionType": "git"}, {"lessThan": "42d758a09d2c46c42357ecde9a5492f015bde2e5", "status": "affected", "version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "versionType": "git"}, {"lessThan": "52adb2dff7ce3d8430e2bdc5988b618a430def85", "status": "affected", "version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "versionType": "git"}, {"lessThan": "278a5659c391fe5afe5f9ce1bad1fd24e90144f1", "status": "affected", "version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "versionType": "git"}, {"lessThan": "daedde7f024ecf88bc8e832ed40cf2c795f0796a", "status": "affected", "version": "4aeec3984ddc853f7c65903bde472ffdef738bae", "versionType": "git"}, {"status": "affected", "version": "d62dccb417cf972c978bf3c68a7d5e846bcf953e", "versionType": "git"}, {"status": "affected", "version": "6694b8daffac5a8661071f085608afc78f7acd08", "versionType": "git"}, {"lessThan": "5.10.261", "status": "affected", "version": "5.10.37", "versionType": "semver"}, {"lessThan": "5.12", "status": "affected", "version": "5.11.21", "versionType": "semver"}, {"lessThan": "5.13", "status": "affected", "version": "5.12.4", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/vfio/pci/vfio_pci_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"lessThan": "5.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.96", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.39", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc2", "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\nvfio/pci: Release the VGA arbiter client on register_device() failure\n\nThe re-order in the Fixes commit below displaced vfio_pci_vga_init() as\nthe last failure point of what is now vfio_pci_core_register_device()\nwithout introducing an unwind for the VGA arbiter registration.\n\nIn current kernels this is mostly benign because vfio_pci_set_decode()\nonly uses pci_dev state, but the original failure path could leave a\ncallback with a freed vdev cookie. The stale registration also becomes\nunsafe again once the callback follows drvdata to the vfio device.\n\nAdd the required VGA unwind callout."}], "id": "CVE-2026-64475", "lastModified": "2026-07-27T05:16:53.927", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-25T10:17:32.980", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0f2a35a0c7ea7da347b814750eaa78adf3582381"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/278a5659c391fe5afe5f9ce1bad1fd24e90144f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/42d758a09d2c46c42357ecde9a5492f015bde2e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/52adb2dff7ce3d8430e2bdc5988b618a430def85"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8d65decde9afd2bd78bcfffdc0df73b82a0b5509"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e0a3f642e607848669235f5069f35640abbfc88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/daedde7f024ecf88bc8e832ed40cf2c795f0796a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef4c38d30b3744e89eb5048218904bb629ea8d47"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: vfio/pci: Release the VGA arbiter client on register_device() failure", "id": "2507147", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507147"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["A flaw was found in the Linux kernel's vfio/pci subsystem. A missing cleanup operation during device registration could lead to a stale registration and a callback using freed memory. This vulnerability could result in system instability or potentially lead to a denial of service."], "name": "CVE-2026-64475", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64475\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64475\nhttps://lore.kernel.org/linux-cve-announce/2026072546-CVE-2026-64475-8842@gregkh/T"], "threat_severity": "Moderate"}

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