{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53558",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53558"
  ],
  "published": "2025-10-04T15:17:41Z",
  "summary": "rcu-tasks: Avoid pr_info() with spin lock in cblist_init_generic()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu-tasks: Avoid pr_info() with spin lock in cblist_init_generic()\n\npr_info() is called with rtp->cbs_gbl_lock spin lock locked.  Because\npr_info() calls printk() that might sleep, this will result in BUG\nlike below:\n\n[    0.206455] cblist_init_generic: Setting adjustable number of callback queues.\n[    0.206463]\n[    0.206464] =============================\n[    0.206464] [ BUG: Invalid wait context ]\n[    0.206465] 5.19.0-00428-g9de1f9c8ca51 #5 Not tainted\n[    0.206466] -----------------------------\n[    0.206466] swapper/0/1 is trying to lock:\n[    0.206467] ffffffffa0167a58 (&port_lock_key){....}-{3:3}, at: serial8250_console_write+0x327/0x4a0\n[    0.206473] other info that might help us debug this:\n[    0.206473] context-{5:5}\n[    0.206474] 3 locks held by swapper/0/1:\n[    0.206474]  #0: ffffffff9eb597e0 (rcu_tasks.cbs_gbl_lock){....}-{2:2}, at: cblist_init_generic.constprop.0+0x14/0x1f0\n[    0.206478]  #1: ffffffff9eb579c0 (console_lock){+.+.}-{0:0}, at: _printk+0x63/0x7e\n[    0.206482]  #2: ffffffff9ea77780 (console_owner){....}-{0:0}, at: console_emit_next_record.constprop.0+0x111/0x330\n[    0.206485] stack backtrace:\n[    0.206486] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-00428-g9de1f9c8ca51 #5\n[    0.206488] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.fc36 04/01/2014\n[    0.206489] Call Trace:\n[    0.206490]  <TASK>\n[    0.206491]  dump_stack_lvl+0x6a/0x9f\n[    0.206493]  __lock_acquire.cold+0x2d7/0x2fe\n[    0.206496]  ? stack_trace_save+0x46/0x70\n[    0.206497]  lock_acquire+0xd1/0x2f0\n[    0.206499]  ? serial8250_console_write+0x327/0x4a0\n[    0.206500]  ? __lock_acquire+0x5c7/0x2720\n[    0.206502]  _raw_spin_lock_irqsave+0x3d/0x90\n[    0.206504]  ? serial8250_console_write+0x327/0x4a0\n[    0.206506]  serial8250_console_write+0x327/0x4a0\n[    0.206508]  console_emit_next_record.constprop.0+0x180/0x330\n[    0.206511]  console_unlock+0xf7/0x1f0\n[    0.206512]  vprintk_emit+0xf7/0x330\n[    0.206514]  _printk+0x63/0x7e\n[    0.206516]  cblist_init_generic.constprop.0.cold+0x24/0x32\n[    0.206518]  rcu_init_tasks_generic+0x5/0xd9\n[    0.206522]  kernel_init_freeable+0x15b/0x2a2\n[    0.206523]  ? rest_init+0x160/0x160\n[    0.206526]  kernel_init+0x11/0x120\n[    0.206527]  ret_from_fork+0x1f/0x30\n[    0.206530]  </TASK>\n[    0.207018] cblist_init_generic: Setting shift to 1 and lim to 1.\n\nThis patch moves pr_info() so that it is called without\nrtp->cbs_gbl_lock locked.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.42"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53558"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9027d69221ff96e1356f070f7feb2ff989ae7388"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ea9b81c7d9104040b46a84d2303045de267f5557"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5fc8cbe4cf0fd34ded8045c385790c3bf04f6785"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}