CVE-2026-53242 (GCVE-0-2026-53242)
Vulnerability from cvelistv5
Published
2026-06-25 08:39
Modified
2026-08-05 12:34
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams snd_pcm_drain() uses init_waitqueue_entry which does not clear entry.prev/next, and add_wait_queue with a conditional remove_wait_queue that is skipped when to_check is no longer in the group after concurrent UNLINK. The orphaned wait entry remains on the unlinked substream sleep queue. On the next drain iteration, add_wait_queue adds the entry to a new queue while still linked on the old one, corrupting both lists. A subsequent wake_up dereferences NULL at the func pointer (mapped from the spinlock at offset 0 of the misinterpreted wait_queue_head_t), causing a kernel panic. Replace init_waitqueue_entry/add_wait_queue/conditional remove_wait_queue with init_wait_entry/prepare_to_wait/ finish_wait. init_wait_entry clears prev/next via INIT_LIST_HEAD on each iteration and sets autoremove_wake_function which auto-removes the entry on wake-up. finish_wait safely handles both the already-removed and still-queued cases.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9baee36e8c5443411c4629afabafaff8a46a23fd
Version: fc71f888994569f87d5bee20b1ac6c9c1e3a7a79
Version: 629cf09464cf98670996ea5c191dc9743e6f3f00
Version: ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432
Version: 4a758e9a1f5ed722f83c4dd35f867fe811553bcb
Version: 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6
Version: 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6
Version: c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694
Version: 5.10.253   ≤
Version: 6.1.167   ≤
Version: 6.6.130   ≤
Version: 6.12.78   ≤
Version: 6.18.19   ≤
Version: 6.19.9   ≤
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/core/pcm_native.c"
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          "product": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams\n\nsnd_pcm_drain() uses init_waitqueue_entry which does not clear\nentry.prev/next, and add_wait_queue with a conditional\nremove_wait_queue that is skipped when to_check is no longer\nin the group after concurrent UNLINK.  The orphaned wait entry\nremains on the unlinked substream sleep queue.  On the next\ndrain iteration, add_wait_queue adds the entry to a new queue\nwhile still linked on the old one, corrupting both lists.  A\nsubsequent wake_up dereferences NULL at the func pointer\n(mapped from the spinlock at offset 0 of the misinterpreted\nwait_queue_head_t), causing a kernel panic.\n\nReplace init_waitqueue_entry/add_wait_queue/conditional\nremove_wait_queue with init_wait_entry/prepare_to_wait/\nfinish_wait.  init_wait_entry clears prev/next via\nINIT_LIST_HEAD on each iteration and sets\nautoremove_wake_function which auto-removes the entry on\nwake-up.  finish_wait safely handles both the already-removed\nand still-queued cases."
        }
      ],
      "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 code is reached from local userspace through ALSA PCM character-device ioctls such as SNDRV_PCM_IOCTL_LINK, SNDRV_PCM_IOCTL_UNLINK, and SNDRV_PCM_IOCTL_DRAIN. It is not reachable by remote network packets or adjacent/physical protocols.\nAC:L - The bug is a race, but the attacker can control both sides by using multiple PCM file descriptors/threads to link streams, block in drain, and concurrently unlink. No condition outside attacker control is required once suitable PCM devices are accessible.\nPR:L - No kernel capability check gates the vulnerable ioctl path, but the attacker needs local access to open ALSA PCM device nodes. That corresponds to a basic unprivileged local user with device access, not real root/admin privileges.\nUI:N - Exploitation is driven entirely by the attacker\u0027s own ioctl calls on opened PCM file descriptors. No victim user action is required.\nS:U - The vulnerability is in the kernel ALSA subsystem and affects kernel resources under the same security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The documented failure is a panic, but the primitive is kernel wait-queue list corruption with an orphaned stack wait entry and cross-queue linkage under attacker-controlled timing. Under the higher-severity rule, this memory corruption is treated as potentially usable for kernel memory disclosure.\nI:H - The bug corrupts kernel wait-queue list pointers and can leave stale wait entries reachable by later wakeups. Although the observed path dereferences a NULL function pointer, this is kernel memory corruption plausibly usable for control-flow or privilege-impacting writes, so integrity is High.\nA:H - A subsequent wake_up can dereference a NULL/misinterpreted wait-queue function pointer and panic the kernel. This is a reliable high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:28.276Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cac5bf3500ee6422cf64e0df0b5daeecfed42917"
        },
        {
          "url": "https://git.kernel.org/stable/c/d842f26a167e77a36f3ed333b9fa99d36ef99fe6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d68b621bb5a48051932f1017a6e1bc9b18f854d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/b053fcd8912f06c30f932f5b8ec41c72de474695"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd98837db15f323463b8df07282ac723bd5c3fed"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c71a9522555ff137a9ca36b15d759ca04d84788"
        },
        {
          "url": "https://git.kernel.org/stable/c/88fe2e3658726cb21ff2dcf9770bf672f9b9d31b"
        }
      ],
      "title": "ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53242",
    "datePublished": "2026-06-25T08:39:37.129Z",
    "dateReserved": "2026-06-09T07:44:35.393Z",
    "dateUpdated": "2026-08-05T12:34:28.276Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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