ghsa-fw9v-j9g8-g322
Vulnerability from github
Published
2025-05-01 15:31
Modified
2025-05-01 15:31
Details

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

capabilities: fix undefined behavior in bit shift for CAP_TO_MASK

Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below:

UBSAN: shift-out-of-bounds in security/commoncap.c:1252:2 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c cap_task_prctl+0x561/0x6f0 security_task_prctl+0x5a/0xb0 __x64_sys_prctl+0x61/0x8f0 do_syscall_64+0x58/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49870"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-01T15:16:11Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncapabilities: fix undefined behavior in bit shift for CAP_TO_MASK\n\nShifting signed 32-bit value by 31 bits is undefined, so changing\nsignificant bit to unsigned. The UBSAN warning calltrace like below:\n\nUBSAN: shift-out-of-bounds in security/commoncap.c:1252:2\nleft shift of 1 by 31 places cannot be represented in type \u0027int\u0027\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x7d/0xa5\n dump_stack+0x15/0x1b\n ubsan_epilogue+0xe/0x4e\n __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c\n cap_task_prctl+0x561/0x6f0\n security_task_prctl+0x5a/0xb0\n __x64_sys_prctl+0x61/0x8f0\n do_syscall_64+0x58/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n \u003c/TASK\u003e",
  "id": "GHSA-fw9v-j9g8-g322",
  "modified": "2025-05-01T15:31:50Z",
  "published": "2025-05-01T15:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49870"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/151dc8087b5609e53b069c068e3f3ee100efa586"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27bdb134c043ff32c459d98f16550d0ffa0b3c34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5661f111a1616ac105ec8cec81bff99b60f847ac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b79fa628e2ab789e629a83cd211ef9b4c1a593e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65b0bc7a0690861812ade523d19f82688ab819dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbaab08c8677d598244d21afb7818e44e1c5d826"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fcbd2b336834bd24e1d9454ad5737856470c10d7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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