{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.25-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.25-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.25-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  tracing/synthetic: Fix races on freeing last_cmd  Currently, the \"last_cmd\" variable can be accessed by multiple processes asynchronously when multiple users manipulate synthetic_events node at the same time, it could lead to use-after-free or double-free.  This patch add \"lastcmd_mutex\" to prevent \"last_cmd\" from being accessed asynchronously.  ================================================================  It's easy to reproduce in the KASAN environment by running the two scripts below in different shells.  script 1:         while :         do                 echo -n -e '\\x88' \u003e /sys/kernel/tracing/synthetic_events         done  script 2:         while :         do                 echo -n -e '\\xb0' \u003e /sys/kernel/tracing/synthetic_events         done  ================================================================ double-free scenario:      process A                       process B -------------------               --------------- 1.kstrdup last_cmd                                   2.free last_cmd 3.free last_cmd(double-free)  ================================================================ use-after-free scenario:      process A                       process B -------------------               --------------- 1.kstrdup last_cmd                                   2.free last_cmd 3.tracing_log_err(use-after-free)  ================================================================  Appendix 1. KASAN report double-free:  BUG: KASAN: double-free in kfree+0xdc/0x1d4 Free of addr ***** by task sh/4879 Call trace:         ...         kfree+0xdc/0x1d4         create_or_delete_synth_event+0x60/0x1e8         trace_parse_run_command+0x2bc/0x4b8         synth_events_write+0x20/0x30         vfs_write+0x200/0x830         ...  Allocated by task 4879:         ...         kstrdup+0x5c/0x98         create_or_delete_synth_event+0x6c/0x1e8         trace_parse_run_command+0x2bc/0x4b8         synth_events_write+0x20/0x30         vfs_write+0x200/0x830         ...  Freed by task 5464:         ...         kfree+0xdc/0x1d4         create_or_delete_synth_event+0x60/0x1e8         trace_parse_run_command+0x2bc/0x4b8         synth_events_write+0x20/0x30         vfs_write+0x200/0x830         ...  ================================================================ Appendix 2. KASAN report use-after-free:  BUG: KASAN: use-after-free in strlen+0x5c/0x7c Read of size 1 at addr ***** by task sh/5483 sh: CPU: 7 PID: 5483 Comm: sh         ...         __asan_report_load1_noabort+0x34/0x44         strlen+0x5c/0x7c         tracing_log_err+0x60/0x444         create_or_delete_synth_event+0xc4/0x204         trace_parse_run_command+0x2bc/0x4b8         synth_events_write+0x20/0x30         vfs_write+0x200/0x830         ...  Allocated by task 5483:         ...         kstrdup+0x5c/0x98         create_or_delete_synth_event+0x80/0x204         trace_parse_run_command+0x2bc/0x4b8         synth_events_write+0x20/0x30         vfs_write+0x200/0x830         ...  Freed by task 5480:         ...         kfree+0xdc/0x1d4         create_or_delete_synth_event+0x74/0x204         trace_parse_run_command+0x2bc/0x4b8         synth_events_write+0x20/0x30         vfs_write+0x200/0x830         ...",
  "id": "DEBIAN-CVE-2023-53478",
  "modified": "2026-04-28T19:51:18.502524620Z",
  "published": "2025-10-01T12:15:50.270Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2023-53478"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2023-53478"
  ]
}