CVE-2026-97996

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97996", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:18:58.209Z", "datePublished": "2026-09-25T10:23:26.913Z", "dateUpdated": "2026-10-19T09:12:03.153Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:12:03.153Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio: fix use-after-free in unregister_virtio_device()\n\ndevice_unregister() is device_del() plus put_device(). When the caller\nholds no extra reference, that drops the last one and runs the release\ncallback, which for several transports frees the memory the embedded\nstruct virtio_device sits in. unregister_virtio_device() then calls\nvirtio_debug_device_exit(), which reads dev->debugfs_dir out of the freed\nobject.\n\nAffected transports are the ones whose release callback frees and whose\nremove path takes no reference: virtio_mmio, virtio_vdpa, virtio_uml,\nmlxbf-tmfifo and virtio_ccw. virtio_pci is unaffected because\nvirtio_pci_remove() brackets the call with get_device() and put_device().\n\nRemove the debugfs entries before the device can go away. They are only\naccessed through the protected debugfs interface, so\ndebugfs_remove_recursive() waits for in-progress file operations before\nreturning. Tearing them down while the device is still alive is therefore\nsafe.\n\nReproduced on User-Mode Linux with CONFIG_KASAN and CONFIG_VIRTIO_DEBUG\nby unbinding a virtio-uml device:\n\n BUG: KASAN: slab-use-after-free in virtio_debug_device_exit+0x36/0x4d\n Read of size 8 at addr 00000000616e0b10 by task init/1\n __asan_report_load8_noabort\n virtio_debug_device_exit+0x36/0x4d\n unregister_virtio_device+0x48/0x75\n virtio_uml_remove\n platform_remove\n device_release_driver_internal\n unbind_store\n\n Freed by task 1:\n kfree\n virtio_uml_release_dev\n device_release\n kobject_put\n put_device\n device_unregister\n\nWith this applied, the report is gone and unbind is clean."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/virtio/virtio.c"], "versions": [{"version": "96a8326d69fffd7e8c2eb737dc060d8009a33b39", "lessThan": "951cad50cba89e736afdee4a730e0e52f9245c9b", "status": "affected", "versionType": "git"}, {"version": "96a8326d69fffd7e8c2eb737dc060d8009a33b39", "lessThan": "77dbd10a701a30fdfea5c3bb7a29163128f9a9c7", "status": "affected", "versionType": "git"}, {"version": "96a8326d69fffd7e8c2eb737dc060d8009a33b39", "lessThan": "caf042153016d651b55d0fb4a63cdf7d0d23dee2", "status": "affected", "versionType": "git"}, {"version": "96a8326d69fffd7e8c2eb737dc060d8009a33b39", "lessThan": "3f9a0fceb730f5107d52421ead5568eae25a0049", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/virtio/virtio.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "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": "6.10", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/951cad50cba89e736afdee4a730e0e52f9245c9b"}, {"url": "https://git.kernel.org/stable/c/77dbd10a701a30fdfea5c3bb7a29163128f9a9c7"}, {"url": "https://git.kernel.org/stable/c/caf042153016d651b55d0fb4a63cdf7d0d23dee2"}, {"url": "https://git.kernel.org/stable/c/3f9a0fceb730f5107d52421ead5568eae25a0049"}], "title": "virtio: fix use-after-free in unregister_virtio_device()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/virtio/virtio.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "951cad50cba89e736afdee4a730e0e52f9245c9b", "status": "affected", "version": "96a8326d69fffd7e8c2eb737dc060d8009a33b39", "versionType": "git"}, {"lessThan": "77dbd10a701a30fdfea5c3bb7a29163128f9a9c7", "status": "affected", "version": "96a8326d69fffd7e8c2eb737dc060d8009a33b39", "versionType": "git"}, {"lessThan": "caf042153016d651b55d0fb4a63cdf7d0d23dee2", "status": "affected", "version": "96a8326d69fffd7e8c2eb737dc060d8009a33b39", "versionType": "git"}, {"lessThan": "3f9a0fceb730f5107d52421ead5568eae25a0049", "status": "affected", "version": "96a8326d69fffd7e8c2eb737dc060d8009a33b39", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/virtio/virtio.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "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\nvirtio: fix use-after-free in unregister_virtio_device()\n\ndevice_unregister() is device_del() plus put_device(). When the caller\nholds no extra reference, that drops the last one and runs the release\ncallback, which for several transports frees the memory the embedded\nstruct virtio_device sits in. unregister_virtio_device() then calls\nvirtio_debug_device_exit(), which reads dev->debugfs_dir out of the freed\nobject.\n\nAffected transports are the ones whose release callback frees and whose\nremove path takes no reference: virtio_mmio, virtio_vdpa, virtio_uml,\nmlxbf-tmfifo and virtio_ccw. virtio_pci is unaffected because\nvirtio_pci_remove() brackets the call with get_device() and put_device().\n\nRemove the debugfs entries before the device can go away. They are only\naccessed through the protected debugfs interface, so\ndebugfs_remove_recursive() waits for in-progress file operations before\nreturning. Tearing them down while the device is still alive is therefore\nsafe.\n\nReproduced on User-Mode Linux with CONFIG_KASAN and CONFIG_VIRTIO_DEBUG\nby unbinding a virtio-uml device:\n\n BUG: KASAN: slab-use-after-free in virtio_debug_device_exit+0x36/0x4d\n Read of size 8 at addr 00000000616e0b10 by task init/1\n __asan_report_load8_noabort\n virtio_debug_device_exit+0x36/0x4d\n unregister_virtio_device+0x48/0x75\n virtio_uml_remove\n platform_remove\n device_release_driver_internal\n unbind_store\n\n Freed by task 1:\n kfree\n virtio_uml_release_dev\n device_release\n kobject_put\n put_device\n device_unregister\n\nWith this applied, the report is gone and unbind is clean."}], "id": "CVE-2026-97996", "lastModified": "2026-10-19T10:17:51.080", "metrics": {}, "published": "2026-09-25T11:17:27.880", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3f9a0fceb730f5107d52421ead5568eae25a0049"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/77dbd10a701a30fdfea5c3bb7a29163128f9a9c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/951cad50cba89e736afdee4a730e0e52f9245c9b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/caf042153016d651b55d0fb4a63cdf7d0d23dee2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: virtio: fix use-after-free in unregister_virtio_device()", "id": "2541090", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541090"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's virtio subsystem. A local user can trigger a use-after-free condition when unbinding or removing certain virtual I/O (virtio) devices. This issue occurs because the device memory is freed before its debug filesystem entries are removed, resulting in an invalid read operation. Exploitation of this flaw could allow a local attacker to crash the system, leading to a Denial of Service (DoS), or potentially execute arbitrary code."], "name": "CVE-2026-97996", "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": "Out of support scope", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97996\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97996\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97996.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96a8326d69fffd7e8c2eb737dc060d8009a33b39,951cad50cba89e736afdee4a730e0e52f9245c9b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96a8326d69fffd7e8c2eb737dc060d8009a33b39,77dbd10a701a30fdfea5c3bb7a29163128f9a9c7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96a8326d69fffd7e8c2eb737dc060d8009a33b39,caf042153016d651b55d0fb4a63cdf7d0d23dee2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96a8326d69fffd7e8c2eb737dc060d8009a33b39,3f9a0fceb730f5107d52421ead5568eae25a0049)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"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": "6.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T15:30:06.908718+00:00", "updated": "2026-10-01T06:00:13.928927+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}