275 lines
13 KiB
JSON
275 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-48821",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-16T11:38:08.901Z",
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"datePublished": "2024-07-16T11:44:07.965Z",
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"dateUpdated": "2026-08-05T08:52:29.928Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:52:29.928Z"
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},
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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\nmisc: fastrpc: avoid double fput() on failed usercopy\n\nIf the copy back to userland fails for the FASTRPC_IOCTL_ALLOC_DMA_BUFF\nioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact,\ndma_buf_fd() called fd_install() before, i.e. \"consumed\" one reference,\nleaving us with none.\n\nCalling dma_buf_put() will therefore put a reference we no longer own,\nleading to a valid file descritor table entry for an already released\n'file' object which is a straight use-after-free.\n\nSimply avoid calling dma_buf_put() and rely on the process exit code to\ndo the necessary cleanup, if needed, i.e. if the file descriptor is\nstill valid."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is triggered via ioctl(FASTRPC_IOCTL_ALLOC_DMA_BUFF) on the local misc device /dev/fastrpc-*, not via network or adjacent packets.\nAC:L - An attacker can reliably force the copy_to_user failure after dma_buf_fd()/fd_install() by passing a read-only userspace buffer (or racing munmap/mprotect); no conditions outside attacker control are required.\nPR:L - Opening /dev/fastrpc-* and calling ALLOC_DMA_BUFF requires no capabilities in the driver; FastRPC is designed for unprivileged userspace clients (e.g. Android apps on Qualcomm devices).\nUI:N - The attacker triggers the ioctl themselves; no victim action is needed.\nS:U - Impact is a kernel file-object UAF enabling local privilege escalation within the same OS security authority, not a VM/IOMMU boundary escape.\nC:H - The dangling FD references a freed struct file, a classic UAF primitive that can be leveraged for arbitrary kernel memory disclosure.\nI:H - File UAF enables heap reuse and f_op/control-flow hijacking for arbitrary kernel writes and code execution.\nA:H - Use of the dangling FD after the erroneous dma_buf_put() can crash the kernel (oops/panic) even without full exploitation."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/misc/fastrpc.c"
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],
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/misc/fastrpc.c"
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],
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"versions": [
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{
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"version": "5.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.180",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.101",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.24",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.16.10",
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"lessThanOrEqual": "5.16.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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}
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"title": "misc: fastrpc: avoid double fput() on failed usercopy",
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"id": "CVE-2022-48821",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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