fkie_cve-2022-50578
Vulnerability from fkie_nvd
Published
2025-10-22 14:15
Modified
2025-10-22 21:12
Severity ?
Summary
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
References
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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": "CVE-2022-50578",
"lastModified": "2025-10-22T21:12:48.953",
"metrics": {},
"published": "2025-10-22T14:15:42.803",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/18a7200646958cf8e1b8a933de08122fc50676cd"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3e0efc3f3f5e5c73996782f8db69963e501bb878"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4efa5443817c1b6de22d401aeca5b2481e835f8c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/abaedb68a769e6bf36836b55a2f49b531c5f3f7b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e764ad5918a099ebeb909ccff83893a714e497e1"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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