GHSA-9644-WV3X-7GCF
Vulnerability from github – Published: 2024-06-08 15:31 – Updated: 2025-10-01 15:30In the Linux kernel, the following vulnerability has been resolved:
erofs: reliably distinguish block based and fscache mode
When erofs_kill_sb() is called in block dev based mode, s_bdev may not have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache mode, and then attempt to free an anon_dev that has never been allocated, triggering the following warning:
============================================ ida_free called for id=0 which is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace: erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ============================================
Now when erofs_kill_sb() is called, erofs_sb_info must have been initialised, so use sbi->fsid to distinguish between the two modes.
{
"affected": [],
"aliases": [
"CVE-2024-36966"
],
"database_specific": {
"cwe_ids": [
"CWE-824"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-06-08T13:15:57Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: reliably distinguish block based and fscache mode\n\nWhen erofs_kill_sb() is called in block dev based mode, s_bdev may not\nhave been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled,\nit will be mistaken for fscache mode, and then attempt to free an anon_dev\nthat has never been allocated, triggering the following warning:\n\n============================================\nida_free called for id=0 which is not allocated.\nWARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140\nModules linked in:\nCPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630\nRIP: 0010:ida_free+0x134/0x140\nCall Trace:\n \u003cTASK\u003e\n erofs_kill_sb+0x81/0x90\n deactivate_locked_super+0x35/0x80\n get_tree_bdev+0x136/0x1e0\n vfs_get_tree+0x2c/0xf0\n do_new_mount+0x190/0x2f0\n [...]\n============================================\n\nNow when erofs_kill_sb() is called, erofs_sb_info must have been\ninitialised, so use sbi-\u003efsid to distinguish between the two modes.",
"id": "GHSA-9644-wv3x-7gcf",
"modified": "2025-10-01T15:30:29Z",
"published": "2024-06-08T15:31:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-36966"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371"
}
],
"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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