{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53815",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53815"
  ],
  "published": "2025-12-09T00:01:55Z",
  "summary": "posix-timers: Prevent RT livelock in itimer_delete()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nposix-timers: Prevent RT livelock in itimer_delete()\n\nitimer_delete() has a retry loop when the timer is concurrently expired. On\nnon-RT kernels this just spin-waits until the timer callback has completed,\nexcept for posix CPU timers which have HAVE_POSIX_CPU_TIMERS_TASK_WORK\nenabled.\n\nIn that case and on RT kernels the existing task could live lock when\npreempting the task which does the timer delivery.\n\nReplace spin_unlock() with an invocation of timer_wait_running() to handle\nit the same way as the other retry loops in the posix timer code.",
  "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": "6.1.39"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53815"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1be1ed32daa053484222f7f9beb2b16c624dffd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0670c4c567b27bd8f999a943028f4fe60d1a1106"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e7aff15ba29ba4b3052786b1636fa5c4aa39e179"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f9bd298e3e4d3fd6e19f017789a42d0f332cd555"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c1968bb8a28625cc95d2ad3ca872ab98c9c36d59"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9d9e522010eb5685d8b53e8a24320653d9d4cbbf"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}