ghsa-x9pw-p3r7-mr43
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
class: fix possible memory leak in __class_register()
If class_add_groups() returns error, the 'cp->subsys' need be unregister, and the 'cp' need be freed.
We can not call kset_unregister() here, because the 'cls' will be freed in callback function class_release() and it's also freed in caller's error path, it will cause double free.
So fix this by calling kobject_del() and kfree_const(name) to cleanup kobject. Besides, call kfree() to free the 'cp'.
Fault injection test can trigger this:
unreferenced object 0xffff888102fa8190 (size 8): comm "modprobe", pid 502, jiffies 4294906074 (age 49.296s) hex dump (first 8 bytes): 70 6b 74 63 64 76 64 00 pktcdvd. backtrace: [<00000000e7c7703d>] __kmalloc_track_caller+0x1ae/0x320 [<000000005e4d70bc>] kstrdup+0x3a/0x70 [<00000000c2e5e85a>] kstrdup_const+0x68/0x80 [<000000000049a8c7>] kvasprintf_const+0x10b/0x190 [<0000000029123163>] kobject_set_name_vargs+0x56/0x150 [<00000000747219c9>] kobject_set_name+0xab/0xe0 [<0000000005f1ea4e>] __class_register+0x15c/0x49a
unreferenced object 0xffff888037274000 (size 1024): comm "modprobe", pid 502, jiffies 4294906074 (age 49.296s) hex dump (first 32 bytes): 00 40 27 37 80 88 ff ff 00 40 27 37 80 88 ff ff .@'7.....@'7.... 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... backtrace: [<00000000151f9600>] kmem_cache_alloc_trace+0x17c/0x2f0 [<00000000ecf3dd95>] __class_register+0x86/0x49a
{
"affected": [],
"aliases": [
"CVE-2022-50578"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-22T14:15:42Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nclass: fix possible memory leak in __class_register()\n\nIf class_add_groups() returns error, the \u0027cp-\u003esubsys\u0027 need be\nunregister, and the \u0027cp\u0027 need be freed.\n\nWe can not call kset_unregister() here, because the \u0027cls\u0027 will\nbe freed in callback function class_release() and it\u0027s also\nfreed in caller\u0027s error path, it will cause double free.\n\nSo fix this by calling kobject_del() and kfree_const(name) to\ncleanup kobject. Besides, call kfree() to free the \u0027cp\u0027.\n\nFault injection test can trigger this:\n\nunreferenced object 0xffff888102fa8190 (size 8):\n comm \"modprobe\", pid 502, jiffies 4294906074 (age 49.296s)\n hex dump (first 8 bytes):\n 70 6b 74 63 64 76 64 00 pktcdvd.\n backtrace:\n [\u003c00000000e7c7703d\u003e] __kmalloc_track_caller+0x1ae/0x320\n [\u003c000000005e4d70bc\u003e] kstrdup+0x3a/0x70\n [\u003c00000000c2e5e85a\u003e] kstrdup_const+0x68/0x80\n [\u003c000000000049a8c7\u003e] kvasprintf_const+0x10b/0x190\n [\u003c0000000029123163\u003e] kobject_set_name_vargs+0x56/0x150\n [\u003c00000000747219c9\u003e] kobject_set_name+0xab/0xe0\n [\u003c0000000005f1ea4e\u003e] __class_register+0x15c/0x49a\n\nunreferenced object 0xffff888037274000 (size 1024):\n comm \"modprobe\", pid 502, jiffies 4294906074 (age 49.296s)\n hex dump (first 32 bytes):\n 00 40 27 37 80 88 ff ff 00 40 27 37 80 88 ff ff .@\u00277.....@\u00277....\n 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........\n backtrace:\n [\u003c00000000151f9600\u003e] kmem_cache_alloc_trace+0x17c/0x2f0\n [\u003c00000000ecf3dd95\u003e] __class_register+0x86/0x49a",
"id": "GHSA-x9pw-p3r7-mr43",
"modified": "2025-10-22T15:31:10Z",
"published": "2025-10-22T15:31:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50578"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/18a7200646958cf8e1b8a933de08122fc50676cd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3e0efc3f3f5e5c73996782f8db69963e501bb878"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4efa5443817c1b6de22d401aeca5b2481e835f8c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/abaedb68a769e6bf36836b55a2f49b531c5f3f7b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e764ad5918a099ebeb909ccff83893a714e497e1"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
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