194 lines
9.3 KiB
JSON
194 lines
9.3 KiB
JSON
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"cveId": "CVE-2021-47605",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-24T15:11:00.737Z",
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"datePublished": "2024-06-19T14:54:04.323Z",
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"dateUpdated": "2026-08-05T08:48:35.224Z"
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: fix memory corruption in vduse_dev_ioctl()\n\nThe \"config.offset\" comes from the user. There needs to a check to\nprevent it being out of bounds. The \"config.offset\" and\n\"dev->config_size\" variables are both type u32. So if the offset if\nout of bounds then the \"dev->config_size - config.offset\" subtraction\nresults in a very high u32 value. The out of bounds offset can result\nin memory corruption."
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:L - The bug is reached only via the VDUSE_DEV_SET_CONFIG ioctl on the local char device /dev/vduse/$NAME (vduse_dev_ioctl), not via network packet processing or adjacent-link protocols.\nAC:L - The attacker fully controls config.offset, config.length, and the written buffer contents; a single ioctl with offset > config_size triggers the u32 underflow and OOB copy_from_user with no race or other external conditions.\nPR:L - There is no capable() check on this ioctl path, and VDUSE is explicitly designed so an unprivileged userspace process can open /dev/vduse/$NAME and drive the datapath/config updates.\nUI:N - Exploitation requires only issuing the malicious ioctl on an opened VDUSE device fd; no separate victim action is needed.\nS:U - Impact is host-kernel heap memory corruption from a local process in the same OS security authority, yielding privilege escalation rather than a cross-boundary VM/IOMMU escape.\nC:H - Attacker-controlled out-of-bounds write into kernel heap memory can be leveraged into arbitrary read primitives and full confidentiality compromise.\nI:H - The underflow allows copy_from_user of attacker-chosen data past the config buffer (heap OOB write), which is exploitable for arbitrary write and control-flow hijacking.\nA:H - The same memory corruption can cause kernel oops/panic or otherwise take down the system even when not fully exploited for code execution."
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}
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"programFiles": [
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"drivers/vdpa/vdpa_user/vduse_dev.c"
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],
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"version": "0",
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"version": "5.15.11",
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"lessThanOrEqual": "5.15.*",
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"version": "5.16",
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