138 lines
8.1 KiB
JSON
138 lines
8.1 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-2022-49393",
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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": "2025-02-26T02:08:31.562Z",
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"datePublished": "2025-02-26T02:11:24.730Z",
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"dateUpdated": "2026-08-05T08:55:00.985Z"
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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": "2026-08-05T08:55:00.985Z"
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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: fix list iterator in fastrpc_req_mem_unmap_impl\n\nThis is another instance of incorrect use of list iterator and\nchecking it for NULL.\n\nThe list iterator value 'map' will *always* be set and non-NULL\nby list_for_each_entry(), so it is incorrect to assume that the\niterator value will be NULL if the list is empty (in this case, the\ncheck 'if (!map) {' will always be false and never exit as expected).\n\nTo fix the bug, use a new variable 'iter' as the list iterator,\nwhile use the original variable 'map' as a dedicated pointer to\npoint to the found element.\n\nWithout this patch, Kernel crashes with below trace:\n\nUnable to handle kernel access to user memory outside uaccess routines\n at virtual address 0000ffff7fb03750\n...\nCall trace:\n fastrpc_map_create+0x70/0x290 [fastrpc]\n fastrpc_req_mem_map+0xf0/0x2dc [fastrpc]\n fastrpc_device_ioctl+0x138/0xc60 [fastrpc]\n __arm64_sys_ioctl+0xa8/0xec\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xd4/0xfc\n do_el0_svc+0x28/0x90\n el0_svc+0x3c/0x130\n el0t_64_sync_handler+0xa4/0x130\n el0t_64_sync+0x18c/0x190\nCode: 14000016 f94000a5 eb05029f 54000260 (b94018a6)\n---[ end trace 0000000000000000 ]---"
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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 reached via FASTRPC_IOCTL_MEM_UNMAP (and the MEM_MAP copy_to_user failure cleanup) on the local /dev/fastrpc-* misc device ioctl path, not via network or adjacent protocols.\nAC:L - An attacker who can open the device can populate fl->maps and then issue MEM_UNMAP with a non-matching fd/vaddr (or force the MEM_MAP cleanup path), reliably taking the bad iterator path with no race or victim-controlled timing.\nPR:L - fastrpc_device_open and the MEM_MAP/MEM_UNMAP ioctls have no capability checks; on Qualcomm/Android deployments unprivileged apps can obtain FastRPC device access (directly or via DSP HAL FD passing), so only low local privileges are required.\nUI:N - Exploitation requires no victim action; the attacker triggers the vulnerable ioctl sequence themselves once they have the device file descriptor.\nS:U - Impact is kernel memory corruption / privilege escalation within the host Linux kernel authority; it does not by itself cross a VM, IOMMU, or other separate security boundary.\nC:H - The failed lookup leaves map as a type-confused pointer into fastrpc_user, then reads forged map fields and can drive fastrpc_free_map/kfree on that object, yielding heap corruption that can be leveraged for arbitrary kernel read under the required uncertainty rule.\nI:H - Calling fastrpc_map_put on the bogus map can invoke fastrpc_free_map and kfree an interior pointer into the fastrpc_user allocation, producing heap metadata corruption exploitable for arbitrary write / control-flow hijacking.\nA:H - The commit documents a kernel oops from corrupted pointer dereference (userspace address used as a kernel pointer), so availability impact is a full kernel crash."
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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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"versions": [
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{
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"version": "5c1b97c7d7b736e6439af4f43a65837bc72f56c1",
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"lessThan": "2d12905aad462383f4e7a5fdb024d2b7ae2d10cf",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5c1b97c7d7b736e6439af4f43a65837bc72f56c1",
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"lessThan": "c5c07c5958cf0c9af6e76813e6de15d42ee49822",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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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": "5.18",
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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": "5.18",
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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": "5.18.3",
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"lessThanOrEqual": "5.18.*",
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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": "5.19",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.18",
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"versionEndExcluding": "5.18.3"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.18",
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"versionEndExcluding": "5.19"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/2d12905aad462383f4e7a5fdb024d2b7ae2d10cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/c5c07c5958cf0c9af6e76813e6de15d42ee49822"
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}
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],
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"title": "misc: fastrpc: fix list iterator in fastrpc_req_mem_unmap_impl",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |