CVE-2022-50578 (GCVE-0-2022-50578)

Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2025-10-22 13:23
VLAI?
Title
class: fix possible memory leak in __class_register()
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ced6473e7486702f530a49f886b73195e4977734 , < 4efa5443817c1b6de22d401aeca5b2481e835f8c (git)
Affected: ced6473e7486702f530a49f886b73195e4977734 , < 3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd (git)
Affected: ced6473e7486702f530a49f886b73195e4977734 , < 3e0efc3f3f5e5c73996782f8db69963e501bb878 (git)
Affected: ced6473e7486702f530a49f886b73195e4977734 , < 18a7200646958cf8e1b8a933de08122fc50676cd (git)
Affected: ced6473e7486702f530a49f886b73195e4977734 , < 417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7 (git)
Affected: ced6473e7486702f530a49f886b73195e4977734 , < e764ad5918a099ebeb909ccff83893a714e497e1 (git)
Affected: ced6473e7486702f530a49f886b73195e4977734 , < abaedb68a769e6bf36836b55a2f49b531c5f3f7b (git)
Affected: ced6473e7486702f530a49f886b73195e4977734 , < 8c3e8a6bdb5253b97ad532570f8b5db5f7a06407 (git)
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    Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/base/class.c"
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              "version": "4.19.270",
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              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.229",
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
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              "status": "unaffected",
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      ],
      "cpeApplicability": [
        {
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              "negate": false,
              "operator": "OR"
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      ],
      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-22T13:23:31.565Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4efa5443817c1b6de22d401aeca5b2481e835f8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e0efc3f3f5e5c73996782f8db69963e501bb878"
        },
        {
          "url": "https://git.kernel.org/stable/c/18a7200646958cf8e1b8a933de08122fc50676cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/e764ad5918a099ebeb909ccff83893a714e497e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/abaedb68a769e6bf36836b55a2f49b531c5f3f7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407"
        }
      ],
      "title": "class: fix possible memory leak in __class_register()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50578",
    "datePublished": "2025-10-22T13:23:31.565Z",
    "dateReserved": "2025-10-22T13:20:23.761Z",
    "dateUpdated": "2025-10-22T13:23:31.565Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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