CVE-2026-74313

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It is not triggered by remote network traffic, adjacent wireless protocols, or physical device attachment.\nAC:L - The attacker fully controls both sides of the race by creating a VDUSE device, then concurrently calling open() and VDUSE_DESTROY_DEV from their own threads. No timing or layout conditions outside attacker control are required beyond standard thread scheduling.\nPR:L - Neither the open nor destroy paths enforce capabilities beyond device-node access; only VIRTIO_ID_NET creation requires CAP_NET_ADMIN. VDUSE is designed so userspace dataplane operators with access to /dev/vduse nodes can create, open, and destroy block devices without full host admin rights.\nUI:N - Exploitation requires no victim interaction. The attacker creates their own VDUSE instance and triggers the open/destroy race from their process; no separate user must mount, configure, or open the device.\nS:C - On cloud and virtualization hosts where VDUSE is delegated to containers or NFV tenant workloads, kernel UAF exploitation crosses from the tenant/container security boundary to full host kernel compromise, comparable to a VM or sandbox escape.\nC:H - The race produces a use-after-free of kmalloc'd struct vduse_dev. Locking and dereferencing the freed object, plus subsequent ioctl/read/write using dangling file->private_data, enables slab reuse and arbitrary kernel memory disclosure.\nI:H - UAF of vduse_dev allows heap grooming over mutexes, virtqueue pointers, and config buffers. Follow-on VDUSE ioctls (SET_CONFIG, VQ_SETUP, IOTLB) on the dangling fd provide exploitable arbitrary-write and control-flow hijack primitives.\nA:H - Use-after-free during mutex_lock on the freed device or later VDUSE operations can immediately corrupt kernel memory and trigger oops/panic, fully denying system availability even before full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/vdpa/vdpa_user/vduse_dev.c"], "versions": [{"version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "35483c5306e09b3190ff937089d404a78012695c", "status": "affected", "versionType": "git"}, {"version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "5c1560be8aa6849356455af67518d35c551cbd95", "status": "affected", "versionType": "git"}, {"version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": 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It is not triggered by remote network traffic, adjacent wireless protocols, or physical device attachment.\nAC:L - The attacker fully controls both sides of the race by creating a VDUSE device, then concurrently calling open() and VDUSE_DESTROY_DEV from their own threads. No timing or layout conditions outside attacker control are required beyond standard thread scheduling.\nPR:L - Neither the open nor destroy paths enforce capabilities beyond device-node access; only VIRTIO_ID_NET creation requires CAP_NET_ADMIN. VDUSE is designed so userspace dataplane operators with access to /dev/vduse nodes can create, open, and destroy block devices without full host admin rights.\nUI:N - Exploitation requires no victim interaction. The attacker creates their own VDUSE instance and triggers the open/destroy race from their process; no separate user must mount, configure, or open the device.\nS:C - On cloud and virtualization hosts where VDUSE is delegated to containers or NFV tenant workloads, kernel UAF exploitation crosses from the tenant/container security boundary to full host kernel compromise, comparable to a VM or sandbox escape.\nC:H - The race produces a use-after-free of kmalloc'd struct vduse_dev. Locking and dereferencing the freed object, plus subsequent ioctl/read/write using dangling file->private_data, enables slab reuse and arbitrary kernel memory disclosure.\nI:H - UAF of vduse_dev allows heap grooming over mutexes, virtqueue pointers, and config buffers. Follow-on VDUSE ioctls (SET_CONFIG, VQ_SETUP, IOTLB) on the dangling fd provide exploitable arbitrary-write and control-flow hijack primitives.\nA:H - Use-after-free during mutex_lock on the freed device or later VDUSE operations can immediately corrupt kernel memory and trigger oops/panic, fully denying system availability even before full exploitation."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "35483c5306e09b3190ff937089d404a78012695c", "versionType": "git"}, {"status": "affected", "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "5c1560be8aa6849356455af67518d35c551cbd95", "versionType": "git"}, {"status": "affected", "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "93ed4692f2299a40346025979f40e4a9b7b33af7", "versionType": "git"}, {"status": "affected", 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dev->lock has been\nacquired in the open path, matching the lock ordering already used by\nthe destroy path."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": 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use-after-free.\n\nClose this race by keeping vduse_lock held until dev->lock has been\nacquired in the open path, matching the lock ordering already used by\nthe destroy path."}], "id": "CVE-2026-74313", "lastModified": "2026-10-16T19:17:38.677", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74313", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:53:05.168424Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:31.460", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35483c5306e09b3190ff937089d404a78012695c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5c1560be8aa6849356455af67518d35c551cbd95"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/79e12c891940b0c4c75881b7fd82a8cbb8ac97be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/93ed4692f2299a40346025979f40e4a9b7b33af7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a2d0a57538fd0b3b3ab75d64bb64f4cd2fab13a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d94e2947203aead590fd63f667d316d4475d65af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e440e077748939839d9f76e24383b76b785f80ce"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: vduse: hold vduse_lock across IDR lookup in open path", "id": "2516809", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516809"}, "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-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvduse: hold vduse_lock across IDR lookup in open path\nvduse_dev_open() looks up struct vduse_dev through the IDR and then\nacquires dev->lock only after vduse_lock has been dropped.\nThis leaves a window where a concurrent VDUSE_DESTROY_DEV can remove the\nsame object from the IDR and free it before the open path locks the\ndevice, leading to a use-after-free.\nClose this race by keeping vduse_lock held until dev->lock has been\nacquired in the open path, matching the lock ordering already used by\nthe destroy path.", "A flaw was found in the Linux kernel's vduse component. A race condition in the `vduse_dev_open()` function allows a memory object to be freed while still in use. This use-after-free vulnerability could enable a local attacker to cause a system crash (denial of service) or potentially execute arbitrary code with elevated privileges."], "name": "CVE-2026-74313", "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": "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": "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"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74313\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74313\nhttps://lore.kernel.org/linux-cve-announce/2026081552-CVE-2026-74313-0cf2@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8a6153b6c59d95c0e091f053f6f180952ade91e,35483c5306e09b3190ff937089d404a78012695c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8a6153b6c59d95c0e091f053f6f180952ade91e,5c1560be8aa6849356455af67518d35c551cbd95)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8a6153b6c59d95c0e091f053f6f180952ade91e,79e12c891940b0c4c75881b7fd82a8cbb8ac97be)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8a6153b6c59d95c0e091f053f6f180952ade91e,93ed4692f2299a40346025979f40e4a9b7b33af7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8a6153b6c59d95c0e091f053f6f180952ade91e,a2d0a57538fd0b3b3ab75d64bb64f4cd2fab13a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8a6153b6c59d95c0e091f053f6f180952ade91e,d94e2947203aead590fd63f667d316d4475d65af)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c8a6153b6c59d95c0e091f053f6f180952ade91e,e440e077748939839d9f76e24383b76b785f80ce)"}}], "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": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.212,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "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": "2026-08-15T12:30:07.841540+00:00", "updated": "2026-08-22T02:45:03.715607+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}