{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "37745918e0e7575bc40f38da93a99b9fa6406224"
            },
            {
              "fixed": "586b219a22b1032b28b8bd356b963276c5e5bf53"
            },
            {
              "fixed": "f46093dd22969037beb1fce2e043f3236be41c92"
            },
            {
              "fixed": "60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f"
            },
            {
              "fixed": "da3039e91d1f835874ed6e9a33ea19ee80c2cb92"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.12.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53193.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: timer: Forcibly close timer instances at closing\n\nWhen snd_timer object is freed via snd_timer_free() and still pending\nsnd_timer_instance objects are assigned to the timer object, it tries\nto unlink all instances and just set NULL to each ti-\u003etimer, then\nreleases the resources immediately.  The problem is, however, when\nthere are slave timer instances that are associated with a master\ninstance linked to this timer: namely, those slave instances still\npoint to the freed timer object although the master instance is\nunlinked, which may lead to user-after-free.  The bug can be easily\ntriggered particularly when a new userspace-driven timers\n(CONFIG_SND_UTIMER) is involved, since it can create and delete the\ntimer object via a simple file open/close, while the other\napplications may keep accessing to that timer.\n\nThis patch is an attempt to paper over the problem above: now instead\nof just unlinking, call snd_timer_close[_locked]() forcibly for each\npending timer instance, so that all assigned slave timer instances are\nproperly detached, too.  Since snd_timer_close() might be called later\nby the driver that created that instance, the check of\nSNDRV_TIMER_IFLG_DEAD is added at the beginning, too.",
  "id": "CVE-2026-53193",
  "modified": "2026-07-08T05:36:46.205647739Z",
  "published": "2026-06-25T08:39:04.346Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/586b219a22b1032b28b8bd356b963276c5e5bf53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da3039e91d1f835874ed6e9a33ea19ee80c2cb92"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f46093dd22969037beb1fce2e043f3236be41c92"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53193.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53193"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ALSA: timer: Forcibly close timer instances at closing"
}