ghsa-7r25-m49h-vw58
Vulnerability from github
Published
2024-02-27 21:31
Modified
2024-02-27 21:31
Details

In the Linux kernel, the following vulnerability has been resolved:

virtiofs: fix memory leak in virtio_fs_probe()

When accidentally passing twice the same tag to qemu, kmemleak ended up reporting a memory leak in virtiofs. Also, looking at the log I saw the following error (that's when I realised the duplicated tag):

virtiofs: probe of virtio5 failed with error -17

Here's the kmemleak log for reference:

unreferenced object 0xffff888103d47800 (size 1024): comm "systemd-udevd", pid 118, jiffies 4294893780 (age 18.340s) hex dump (first 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff ................ backtrace: [<000000000ebb87c1>] virtio_fs_probe+0x171/0x7ae [virtiofs] [<00000000f8aca419>] virtio_dev_probe+0x15f/0x210 [<000000004d6baf3c>] really_probe+0xea/0x430 [<00000000a6ceeac8>] device_driver_attach+0xa8/0xb0 [<00000000196f47a7>] __driver_attach+0x98/0x140 [<000000000b20601d>] bus_for_each_dev+0x7b/0xc0 [<00000000399c7b7f>] bus_add_driver+0x11b/0x1f0 [<0000000032b09ba7>] driver_register+0x8f/0xe0 [<00000000cdd55998>] 0xffffffffa002c013 [<000000000ea196a2>] do_one_initcall+0x64/0x2e0 [<0000000008f727ce>] do_init_module+0x5c/0x260 [<000000003cdedab6>] __do_sys_finit_module+0xb5/0x120 [<00000000ad2f48c6>] do_syscall_64+0x33/0x40 [<00000000809526b5>] entry_SYSCALL_64_after_hwframe+0x44/0xae

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{
  "affected": [],
  "aliases": [
    "CVE-2021-46956"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-27T19:04:06Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtiofs: fix memory leak in virtio_fs_probe()\n\nWhen accidentally passing twice the same tag to qemu, kmemleak ended up\nreporting a memory leak in virtiofs.  Also, looking at the log I saw the\nfollowing error (that\u0027s when I realised the duplicated tag):\n\n  virtiofs: probe of virtio5 failed with error -17\n\nHere\u0027s the kmemleak log for reference:\n\nunreferenced object 0xffff888103d47800 (size 1024):\n  comm \"systemd-udevd\", pid 118, jiffies 4294893780 (age 18.340s)\n  hex dump (first 32 bytes):\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n    ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff  ................\n  backtrace:\n    [\u003c000000000ebb87c1\u003e] virtio_fs_probe+0x171/0x7ae [virtiofs]\n    [\u003c00000000f8aca419\u003e] virtio_dev_probe+0x15f/0x210\n    [\u003c000000004d6baf3c\u003e] really_probe+0xea/0x430\n    [\u003c00000000a6ceeac8\u003e] device_driver_attach+0xa8/0xb0\n    [\u003c00000000196f47a7\u003e] __driver_attach+0x98/0x140\n    [\u003c000000000b20601d\u003e] bus_for_each_dev+0x7b/0xc0\n    [\u003c00000000399c7b7f\u003e] bus_add_driver+0x11b/0x1f0\n    [\u003c0000000032b09ba7\u003e] driver_register+0x8f/0xe0\n    [\u003c00000000cdd55998\u003e] 0xffffffffa002c013\n    [\u003c000000000ea196a2\u003e] do_one_initcall+0x64/0x2e0\n    [\u003c0000000008f727ce\u003e] do_init_module+0x5c/0x260\n    [\u003c000000003cdedab6\u003e] __do_sys_finit_module+0xb5/0x120\n    [\u003c00000000ad2f48c6\u003e] do_syscall_64+0x33/0x40\n    [\u003c00000000809526b5\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae",
  "id": "GHSA-7r25-m49h-vw58",
  "modified": "2024-02-27T21:31:27Z",
  "published": "2024-02-27T21:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46956"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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