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          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-19T19:57:27.947Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/core/timer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "586b219a22b1032b28b8bd356b963276c5e5bf53",
              "status": "affected",
              "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
              "versionType": "git"
            },
            {
              "lessThan": "f46093dd22969037beb1fce2e043f3236be41c92",
              "status": "affected",
              "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
              "versionType": "git"
            },
            {
              "lessThan": "60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f",
              "status": "affected",
              "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
              "versionType": "git"
            },
            {
              "lessThan": "da3039e91d1f835874ed6e9a33ea19ee80c2cb92",
              "status": "affected",
              "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/core/timer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.94",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.36",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached through local `/dev/snd/timer` opens and ALSA timer ioctls, including `SNDRV_TIMER_IOCTL_CREATE`, `SELECT`, and later access to retained timer instances.\nAC:L - The attacker can create the userspace-driven timer, bind matching master/slave timer instances, close the timer fd to free the object, and then access the stale slave instance without relying on uncontrollable conditions.\nPR:L - The code path has no capability checks, but it requires a local user able to open `/dev/snd/timer` and issue ioctls.\nUI:N - No victim action is required after the attacker has local access; the attacker controls all needed file descriptors and ioctls.\nS:U - The impact is within the kernel/local system security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - This is a kernel use-after-free of `struct snd_timer`; stale timer pointers can be dereferenced by later ioctls and may expose reclaimed kernel heap contents or enable broader memory disclosure.\nI:H - The stale timer pointer is used in paths that take locks and manipulate lists/callback-related state, making kernel heap corruption and control-flow-impacting exploitation defensible.\nA:H - At minimum, dereferencing and locking a freed kernel timer object can trigger a kernel oops, panic, or hang."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:59.686Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/586b219a22b1032b28b8bd356b963276c5e5bf53"
        },
        {
          "url": "https://git.kernel.org/stable/c/f46093dd22969037beb1fce2e043f3236be41c92"
        },
        {
          "url": "https://git.kernel.org/stable/c/60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/da3039e91d1f835874ed6e9a33ea19ee80c2cb92"
        }
      ],
      "title": "ALSA: timer: Forcibly close timer instances at closing",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53193",
    "datePublished": "2026-06-25T08:39:04.346Z",
    "dateReserved": "2026-06-09T07:44:35.390Z",
    "dateUpdated": "2026-10-19T19:57:27.947Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}