GHSA-CHV3-XXV6-8HVR
Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-12-26 21:30In the Linux kernel, the following vulnerability has been resolved:
misc/libmasm/module: Fix two use after free in ibmasm_init_one
In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively.
In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev.
My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.
{
"affected": [],
"aliases": [
"CVE-2021-47334"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T15:15:20Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc/libmasm/module: Fix two use after free in ibmasm_init_one\n\nIn ibmasm_init_one, it calls ibmasm_init_remote_input_dev().\nInside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are\nallocated by input_allocate_device(), and assigned to\nsp-\u003eremote.mouse_dev and sp-\u003eremote.keybd_dev respectively.\n\nIn the err_free_devices error branch of ibmasm_init_one,\nmouse_dev and keybd_dev are freed by input_free_device(), and return\nerror. Then the execution runs into error_send_message error branch\nof ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called\nto unregister the freed sp-\u003eremote.mouse_dev and sp-\u003eremote.keybd_dev.\n\nMy patch add a \"error_init_remote\" label to handle the error of\nibmasm_init_remote_input_dev(), to avoid the uaf bugs.",
"id": "GHSA-chv3-xxv6-8hvr",
"modified": "2024-12-26T21:30:36Z",
"published": "2024-05-21T15:31:43Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47334"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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