CVE-2026-97994

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97994", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:18:58.209Z", "datePublished": "2026-09-25T10:23:25.719Z", "dateUpdated": "2026-10-19T09:12:01.173Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:12:01.173Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost/vdpa: reject VRING_NUM larger than device max\n\nvhost_vring_set_num() accepts any non-zero power-of-two queue size that\nfits in 16 bits. vhost-vdpa then passes that value to set_vq_num()\nwithout comparing it with get_vq_num_max().\n\nA process with access to /dev/vhost-vdpa-* can therefore configure a\nqueue larger than the device advertises. With vdpa_sim, the worker can\nwalk descriptors beyond the mapped descriptor ring. KASAN reports a\n16-byte out-of-bounds read, corresponding to one vring_desc, in the\nvringh IOTLB path:\n\n BUG: KASAN: out-of-bounds in _copy_from_iter\n Read of size 16\n copy_from_iotlb\n copydesc_iotlb\n vringh_getdesc_iotlb\n vdpasim_net_work\n\nCache get_vq_num_max() immediately after reset. Some backends derive\nit from writable queue-size state, so querying it after SET_NUM may\nreturn the current size instead of the device capability. Invalidate\nthe cached value before reset so a failed reset leaves SET_NUM\ndisabled.\n\nFor VHOST_SET_VRING_NUM, copy the complete vring state once and use\nthe same index and size for validation, vq->num, and set_vq_num().\nThis ensures that validation and use operate on the same copied values."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/vhost/vdpa.c"], "versions": [{"version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "lessThan": "4875c65ca53797a0a402fe2bb54d1b12f28b3cda", "status": "affected", "versionType": "git"}, {"version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "lessThan": "1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4", "status": "affected", "versionType": "git"}, {"version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "lessThan": "68232102f20fc961327fb9e0f605a7eaadf030a9", "status": "affected", "versionType": "git"}, {"version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "lessThan": "59522639a7d71cff4e20d594d0b9ea30dd0c77e0", "status": "affected", "versionType": "git"}, {"version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "lessThan": "ccb1dc7c527f8c925925cf92afc76ae590dac311", "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/vhost/vdpa.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "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": "5.7", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4875c65ca53797a0a402fe2bb54d1b12f28b3cda"}, {"url": "https://git.kernel.org/stable/c/1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4"}, {"url": "https://git.kernel.org/stable/c/68232102f20fc961327fb9e0f605a7eaadf030a9"}, {"url": "https://git.kernel.org/stable/c/59522639a7d71cff4e20d594d0b9ea30dd0c77e0"}, {"url": "https://git.kernel.org/stable/c/ccb1dc7c527f8c925925cf92afc76ae590dac311"}], "title": "vhost/vdpa: reject VRING_NUM larger than device max", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/vhost/vdpa.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4875c65ca53797a0a402fe2bb54d1b12f28b3cda", "status": "affected", "version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "versionType": "git"}, {"lessThan": "1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4", "status": "affected", "version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "versionType": "git"}, {"lessThan": "68232102f20fc961327fb9e0f605a7eaadf030a9", "status": "affected", "version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "versionType": "git"}, {"lessThan": "59522639a7d71cff4e20d594d0b9ea30dd0c77e0", "status": "affected", "version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "versionType": "git"}, {"lessThan": "ccb1dc7c527f8c925925cf92afc76ae590dac311", "status": "affected", "version": "4c8cf31885f69e86be0b5b9e6677a26797365e1d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/vhost/vdpa.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"lessThan": "5.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "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\nvhost/vdpa: reject VRING_NUM larger than device max\n\nvhost_vring_set_num() accepts any non-zero power-of-two queue size that\nfits in 16 bits. vhost-vdpa then passes that value to set_vq_num()\nwithout comparing it with get_vq_num_max().\n\nA process with access to /dev/vhost-vdpa-* can therefore configure a\nqueue larger than the device advertises. With vdpa_sim, the worker can\nwalk descriptors beyond the mapped descriptor ring. KASAN reports a\n16-byte out-of-bounds read, corresponding to one vring_desc, in the\nvringh IOTLB path:\n\n BUG: KASAN: out-of-bounds in _copy_from_iter\n Read of size 16\n copy_from_iotlb\n copydesc_iotlb\n vringh_getdesc_iotlb\n vdpasim_net_work\n\nCache get_vq_num_max() immediately after reset. Some backends derive\nit from writable queue-size state, so querying it after SET_NUM may\nreturn the current size instead of the device capability. Invalidate\nthe cached value before reset so a failed reset leaves SET_NUM\ndisabled.\n\nFor VHOST_SET_VRING_NUM, copy the complete vring state once and use\nthe same index and size for validation, vq->num, and set_vq_num().\nThis ensures that validation and use operate on the same copied values."}], "id": "CVE-2026-97994", "lastModified": "2026-10-19T10:17:50.850", "metrics": {}, "published": "2026-09-25T11:17:27.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4875c65ca53797a0a402fe2bb54d1b12f28b3cda"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/59522639a7d71cff4e20d594d0b9ea30dd0c77e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/68232102f20fc961327fb9e0f605a7eaadf030a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ccb1dc7c527f8c925925cf92afc76ae590dac311"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: vhost/vdpa: reject VRING_NUM larger than device max", "id": "2541187", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541187"}, "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-125", "details": ["A flaw was found in the Linux kernel's vhost-vDPA (virtio Data Path Acceleration) subsystem. A local user with access to a vhost-vDPA device can configure a queue size that exceeds the device's maximum supported capacity due to insufficient boundary validation. This improper validation can lead to an out-of-bounds memory read, resulting in a Denial of Service (DoS) through a system crash or potential information disclosure."], "name": "CVE-2026-97994", "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": "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": "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": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97994\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97994\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97994.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c8cf31885f69e86be0b5b9e6677a26797365e1d,1d09201d81b7d3e276860cc7b7dbf6c6cbe8e9b4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c8cf31885f69e86be0b5b9e6677a26797365e1d,68232102f20fc961327fb9e0f605a7eaadf030a9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c8cf31885f69e86be0b5b9e6677a26797365e1d,59522639a7d71cff4e20d594d0b9ea30dd0c77e0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c8cf31885f69e86be0b5b9e6677a26797365e1d,ccb1dc7c527f8c925925cf92afc76ae590dac311)"}}], "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": "semver", "value": "5.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.111,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.53,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.7,7.2.*]"}}, {"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": "2026-09-25T17:15:15.316291+00:00", "updated": "2026-10-01T06:00:13.929803+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}