GHSA-2HRM-9GXC-3C35
Vulnerability from github – Published: 2024-02-27 12:31 – Updated: 2024-04-10 21:30In the Linux kernel, the following vulnerability has been resolved:
mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'
DAMON debugfs interface increases the reference counts of 'struct pid's for targets from the 'target_ids' file write callback ('dbgfs_target_ids_write()'), but decreases the counts only in DAMON monitoring termination callback ('dbgfs_before_terminate()').
Therefore, when 'target_ids' file is repeatedly written without DAMON monitoring start/termination, the reference count is not decreased and therefore memory for the 'struct pid' cannot be freed. This commit fixes this issue by decreasing the reference counts when 'target_ids' is written.
{
"affected": [],
"aliases": [
"CVE-2021-46937"
],
"database_specific": {
"cwe_ids": [
"CWE-668"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-02-27T10:15:08Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/dbgfs: fix \u0027struct pid\u0027 leaks in \u0027dbgfs_target_ids_write()\u0027\n\nDAMON debugfs interface increases the reference counts of \u0027struct pid\u0027s\nfor targets from the \u0027target_ids\u0027 file write callback\n(\u0027dbgfs_target_ids_write()\u0027), but decreases the counts only in DAMON\nmonitoring termination callback (\u0027dbgfs_before_terminate()\u0027).\n\nTherefore, when \u0027target_ids\u0027 file is repeatedly written without DAMON\nmonitoring start/termination, the reference count is not decreased and\ntherefore memory for the \u0027struct pid\u0027 cannot be freed. This commit\nfixes this issue by decreasing the reference counts when \u0027target_ids\u0027 is\nwritten.",
"id": "GHSA-2hrm-9gxc-3c35",
"modified": "2024-04-10T21:30:28Z",
"published": "2024-02-27T12:31:11Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46937"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
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