{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47604", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-24T15:11:00.736Z", "datePublished": "2024-06-19T14:54:03.664Z", "dateUpdated": "2026-08-05T08:48:33.959Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:33.959Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: check that offset is within bounds in get_config()\n\nThis condition checks \"len\" but it does not check \"offset\" and that\ncould result in an out of bounds read if \"offset > dev->config_size\".\nThe problem is that since both variables are unsigned the\n\"dev->config_size - offset\" subtraction would result in a very high\nunsigned value.\n\nI think these checks might not be necessary because \"len\" and \"offset\"\nare supposed to already have been validated using the\nvhost_vdpa_config_validate() function. But I do not know the code\nperfectly, and I like to be safe." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable get_config path is reached through local interfaces (vhost-vdpa ioctl VHOST_VDPA_GET_CONFIG or virtio-vdpa config reads after attaching a VDUSE device), not via network packets.\nAC:L - The attacker fully controls offset and length through the ioctl (or by creating a VDUSE device with a small config_size and feature bits that cause larger-offset reads); no race or other condition beyond attacker control is required.\nPR:L - Exploitation requires access to vhost-vdpa/VDUSE device nodes that are commonly granted to non-root virtualization users (e.g., qemu/kvm group), not capabilities that are only available to real root in the init user namespace.\nUI:N - No victim interaction is needed; the attacker triggers the OOB read directly via ioctl or by attaching/probing the malicious VDUSE device.\nS:U - Impact is confined to the host kernel and the calling process (kernel memory disclosure or oops); this does not cross a VM/IOMMU/sandbox security authority boundary by itself.\nC:H - The underflow allows an unbounded out-of-bounds read from kernel memory past the config buffer, and on the vhost-vdpa path that data is copied to userspace via copy_to_user, enabling arbitrary kernel memory disclosure.\nI:N - The bug is a pure out-of-bounds read (memcpy from config+offset into a destination buffer) with no write primitive or integrity modification of kernel state.\nA:H - A sufficiently large or far OOB read can access unmapped memory and cause a kernel oops/panic, resulting in a full denial of service." } ] } ], "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": "ebbbc5fea3f648175df1aa3f127c78eb0252cc2a", "status": "affected", "versionType": "git" }, { "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e", "lessThan": "dc1db0060c02d119fd4196924eff2d1129e9a442", "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": "5.15.11", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "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": "5.15.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ebbbc5fea3f648175df1aa3f127c78eb0252cc2a" }, { "url": "https://git.kernel.org/stable/c/dc1db0060c02d119fd4196924eff2d1129e9a442" } ], "title": "vduse: check that offset is within bounds in get_config()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:47:40.211Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/ebbbc5fea3f648175df1aa3f127c78eb0252cc2a", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/dc1db0060c02d119fd4196924eff2d1129e9a442", "tags": [ "x_transferred" ] } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2021-47604", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T17:12:14.372380Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:51.680Z" } } ] } }