GHSA-JH22-4F6V-H4PH
Vulnerability from github – Published: 2025-09-22 21:30 – Updated: 2025-09-22 21:30In the Linux kernel, the following vulnerability has been resolved:
misc: fastrpc: fix list iterator in fastrpc_req_mem_unmap_impl
This is another instance of incorrect use of list iterator and checking it for NULL.
The list iterator value 'map' will always be set and non-NULL by list_for_each_entry(), so it is incorrect to assume that the iterator value will be NULL if the list is empty (in this case, the check 'if (!map) {' will always be false and never exit as expected).
To fix the bug, use a new variable 'iter' as the list iterator, while use the original variable 'map' as a dedicated pointer to point to the found element.
Without this patch, Kernel crashes with below trace:
Unable to handle kernel access to user memory outside uaccess routines at virtual address 0000ffff7fb03750 ... Call trace: fastrpc_map_create+0x70/0x290 [fastrpc] fastrpc_req_mem_map+0xf0/0x2dc [fastrpc] fastrpc_device_ioctl+0x138/0xc60 [fastrpc] __arm64_sys_ioctl+0xa8/0xec invoke_syscall+0x48/0x114 el0_svc_common.constprop.0+0xd4/0xfc do_el0_svc+0x28/0x90 el0_svc+0x3c/0x130 el0t_64_sync_handler+0xa4/0x130 el0t_64_sync+0x18c/0x190 Code: 14000016 f94000a5 eb05029f 54000260 (b94018a6) ---[ end trace 0000000000000000 ]---
{
"affected": [],
"aliases": [
"CVE-2022-49393"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:01:15Z",
"severity": "MODERATE"
},
"details": "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 \u0027map\u0027 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 \u0027if (!map) {\u0027 will always be false and never exit as expected).\n\nTo fix the bug, use a new variable \u0027iter\u0027 as the list iterator,\nwhile use the original variable \u0027map\u0027 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 ]---",
"id": "GHSA-jh22-4f6v-h4ph",
"modified": "2025-09-22T21:30:16Z",
"published": "2025-09-22T21:30:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49393"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2d12905aad462383f4e7a5fdb024d2b7ae2d10cf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c5c07c5958cf0c9af6e76813e6de15d42ee49822"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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