{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74313", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.883Z", "datePublished": "2026-08-15T05:58:12.058Z", "dateUpdated": "2026-08-17T05:45:46.036Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:46.036Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: hold vduse_lock across IDR lookup in open path\n\nvduse_dev_open() looks up struct vduse_dev through the IDR and then\nacquires dev->lock only after vduse_lock has been dropped.\n\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.\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." } ], "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 vulnerability is only reachable via local syscalls on VDUSE character devices: open(2) on /dev/vduse/$NAME racing with ioctl(VDUSE_DESTROY_DEV) on /dev/vduse/control. 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": "93ed4692f2299a40346025979f40e4a9b7b33af7", "status": "affected", "versionType": "git" }, { "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "d94e2947203aead590fd63f667d316d4475d65af", "status": "affected", "versionType": "git" }, { "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "a2d0a57538fd0b3b3ab75d64bb64f4cd2fab13a2", "status": "affected", "versionType": "git" }, { "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "79e12c891940b0c4c75881b7fd82a8cbb8ac97be", "status": "affected", "versionType": "git" }, { "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "e440e077748939839d9f76e24383b76b785f80ce", "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/vdpa/vdpa_user/vduse_dev.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.15", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/35483c5306e09b3190ff937089d404a78012695c" }, { "url": "https://git.kernel.org/stable/c/5c1560be8aa6849356455af67518d35c551cbd95" }, { "url": "https://git.kernel.org/stable/c/93ed4692f2299a40346025979f40e4a9b7b33af7" }, { "url": "https://git.kernel.org/stable/c/d94e2947203aead590fd63f667d316d4475d65af" }, { "url": "https://git.kernel.org/stable/c/a2d0a57538fd0b3b3ab75d64bb64f4cd2fab13a2" }, { "url": "https://git.kernel.org/stable/c/79e12c891940b0c4c75881b7fd82a8cbb8ac97be" }, { "url": "https://git.kernel.org/stable/c/e440e077748939839d9f76e24383b76b785f80ce" } ], "title": "vduse: hold vduse_lock across IDR lookup in open path", "x_generator": { "engine": "bippy-1.2.0" } } } }