ghsa-rmcp-v77r-9mqp
Vulnerability from github
Published
2024-03-15 21:30
Modified
2024-03-15 21:30
Details

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

nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect

It's possible to trigger NULL pointer dereference by local unprivileged user, when calling getsockname() after failed bind() (e.g. the bind fails because LLCP_SAP_MAX used as SAP):

BUG: kernel NULL pointer dereference, address: 0000000000000000 CPU: 1 PID: 426 Comm: llcp_sock_getna Not tainted 5.13.0-rc2-next-20210521+ #9 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1 04/01/2014 Call Trace: llcp_sock_getname+0xb1/0xe0 __sys_getpeername+0x95/0xc0 ? lockdep_hardirqs_on_prepare+0xd5/0x180 ? syscall_enter_from_user_mode+0x1c/0x40 __x64_sys_getpeername+0x11/0x20 do_syscall_64+0x36/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xae

This can be reproduced with Syzkaller C repro (bind followed by getpeername): https://syzkaller.appspot.com/x/repro.c?x=14def446e00000

Show details on source website


{
  "affected": [],
  "aliases": [
    "CVE-2021-47115"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-03-15T21:15:06Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect\n\nIt\u0027s possible to trigger NULL pointer dereference by local unprivileged\nuser, when calling getsockname() after failed bind() (e.g. the bind\nfails because LLCP_SAP_MAX used as SAP):\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\n  CPU: 1 PID: 426 Comm: llcp_sock_getna Not tainted 5.13.0-rc2-next-20210521+ #9\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1 04/01/2014\n  Call Trace:\n   llcp_sock_getname+0xb1/0xe0\n   __sys_getpeername+0x95/0xc0\n   ? lockdep_hardirqs_on_prepare+0xd5/0x180\n   ? syscall_enter_from_user_mode+0x1c/0x40\n   __x64_sys_getpeername+0x11/0x20\n   do_syscall_64+0x36/0x70\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThis can be reproduced with Syzkaller C repro (bind followed by\ngetpeername):\nhttps://syzkaller.appspot.com/x/repro.c?x=14def446e00000",
  "id": "GHSA-rmcp-v77r-9mqp",
  "modified": "2024-03-15T21:30:44Z",
  "published": "2024-03-15T21:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47115"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c4559736d9a4ec1ca58ba98ca34e7c4da4c422b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39c15bd2e5d11bcf7f4c3dba2aad9e1e110a5d94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/48ee0db61c8299022ec88c79ad137f290196cac2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ac06a1e013cf5fdd963317ffd3b968560f33bba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d4c4b06ed9fb7a69d0b2e2a73fc73226d25ab70"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93e4ac2a9979a9a4ecc158409ed9c3044dc0ae1f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb6875d48590d8e564092e831ff07fa384d7e477"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffff05b9ee5c74c04bba2801c1f99b31975d74d9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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