ghsa-qgp7-v6fq-jxvw
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
arm64: fix oops in concurrently setting insn_emulation sysctls
emulation_proc_handler() changes table->data for proc_dointvec_minmax and can generate the following Oops if called concurrently with itself:
| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 | Internal error: Oops: 96000006 [#1] SMP | Call trace: | update_insn_emulation_mode+0xc0/0x148 | emulation_proc_handler+0x64/0xb8 | proc_sys_call_handler+0x9c/0xf8 | proc_sys_write+0x18/0x20 | __vfs_write+0x20/0x48 | vfs_write+0xe4/0x1d0 | ksys_write+0x70/0xf8 | __arm64_sys_write+0x20/0x28 | el0_svc_common.constprop.0+0x7c/0x1c0 | el0_svc_handler+0x2c/0xa0 | el0_svc+0x8/0x200
To fix this issue, keep the table->data as &insn->current_mode and use container_of() to retrieve the insn pointer. Another mutex is used to protect against the current_mode update but not for retrieving insn_emulation as table->data is no longer changing.
{
"affected": [],
"aliases": [
"CVE-2022-50206"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:51Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: fix oops in concurrently setting insn_emulation sysctls\n\nemulation_proc_handler() changes table-\u003edata for proc_dointvec_minmax\nand can generate the following Oops if called concurrently with itself:\n\n | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n | Internal error: Oops: 96000006 [#1] SMP\n | Call trace:\n | update_insn_emulation_mode+0xc0/0x148\n | emulation_proc_handler+0x64/0xb8\n | proc_sys_call_handler+0x9c/0xf8\n | proc_sys_write+0x18/0x20\n | __vfs_write+0x20/0x48\n | vfs_write+0xe4/0x1d0\n | ksys_write+0x70/0xf8\n | __arm64_sys_write+0x20/0x28\n | el0_svc_common.constprop.0+0x7c/0x1c0\n | el0_svc_handler+0x2c/0xa0\n | el0_svc+0x8/0x200\n\nTo fix this issue, keep the table-\u003edata as \u0026insn-\u003ecurrent_mode and\nuse container_of() to retrieve the insn pointer. Another mutex is\nused to protect against the current_mode update but not for retrieving\ninsn_emulation as table-\u003edata is no longer changing.",
"id": "GHSA-qgp7-v6fq-jxvw",
"modified": "2025-06-18T12:30:55Z",
"published": "2025-06-18T12:30:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50206"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/04549063d5701976034d8c2bfda3d3a8cbf0409f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/07022e07017ee5540f5559b0aeb916e8383c1e1a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/353b4673d01c512303c45cf2346f630cda73b5c9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6a2fd114678d7fc1b5a0f8865ae98f1c17787455"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d5fec6ba2e4117d196a8259ab54615ffe562460"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/af483947d472eccb79e42059276c4deed76f99a6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b51881b1da57fe9877125dfdd0aac5172958fcfd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cc69ef95988b9ef2fc730ec452a7441efb90ef5e"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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