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CVE-2026-53242 (GCVE-0-2026-53242)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-09-02 12:49
VLAI
Title
ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9baee36e8c5443411c4629afabafaff8a46a23fd , < cac5bf3500ee6422cf64e0df0b5daeecfed42917 (git)
Affected: f2cb2e0d27fb925c73a78f0ce7d6dbf68d3747c1 , < 06eca2235a3fd281dddf25b0a97772b25b5bb573 (git)
Affected: fc71f888994569f87d5bee20b1ac6c9c1e3a7a79 , < d842f26a167e77a36f3ed333b9fa99d36ef99fe6 (git)
Affected: 629cf09464cf98670996ea5c191dc9743e6f3f00 , < d68b621bb5a48051932f1017a6e1bc9b18f854d0 (git)
Affected: ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432 , < b053fcd8912f06c30f932f5b8ec41c72de474695 (git)
Affected: 4a758e9a1f5ed722f83c4dd35f867fe811553bcb , < cd98837db15f323463b8df07282ac723bd5c3fed (git)
Affected: 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 , < 7c71a9522555ff137a9ca36b15d759ca04d84788 (git)
Affected: 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 , < 88fe2e3658726cb21ff2dcf9770bf672f9b9d31b (git)
Affected: c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694 (git)
Affected: 5.10.253 , < 5.10.259 (semver)
Affected: 6.1.167 , < 6.1.176 (semver)
Affected: 6.6.130 , < 6.6.143 (semver)
Affected: 6.12.78 , < 6.12.94 (semver)
Affected: 6.18.19 , < 6.18.36 (semver)
Affected: 6.19.9 , < 6.20 (semver)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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."
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            "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"
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              "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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/88fe2e3658726cb21ff2dcf9770bf672f9b9d31b"
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      ],
      "title": "ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53242",
    "datePublished": "2026-06-25T08:39:37.129Z",
    "dateReserved": "2026-06-09T07:44:35.393Z",
    "dateUpdated": "2026-09-02T12:49:37.764Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53242",
      "date": "2026-09-12",
      "epss": "0.00129",
      "percentile": "0.02888"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:46:06.000Z",
      "cve": "CVE-2026-53242",
      "id": "msrc_CVE-2026-53242",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53242.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53242\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-25T09:16:42.140\",\"lastModified\":\"2026-09-02T13:18:01.617\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/core/pcm_native.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9baee36e8c5443411c4629afabafaff8a46a23fd\",\"lessThan\":\"cac5bf3500ee6422cf64e0df0b5daeecfed42917\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2cb2e0d27fb925c73a78f0ce7d6dbf68d3747c1\",\"lessThan\":\"06eca2235a3fd281dddf25b0a97772b25b5bb573\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fc71f888994569f87d5bee20b1ac6c9c1e3a7a79\",\"lessThan\":\"d842f26a167e77a36f3ed333b9fa99d36ef99fe6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"629cf09464cf98670996ea5c191dc9743e6f3f00\",\"lessThan\":\"d68b621bb5a48051932f1017a6e1bc9b18f854d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432\",\"lessThan\":\"b053fcd8912f06c30f932f5b8ec41c72de474695\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a758e9a1f5ed722f83c4dd35f867fe811553bcb\",\"lessThan\":\"cd98837db15f323463b8df07282ac723bd5c3fed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6\",\"lessThan\":\"7c71a9522555ff137a9ca36b15d759ca04d84788\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6\",\"lessThan\":\"88fe2e3658726cb21ff2dcf9770bf672f9b9d31b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.253\",\"lessThan\":\"5.10.259\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.167\",\"lessThan\":\"6.1.176\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.130\",\"lessThan\":\"6.6.143\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.78\",\"lessThan\":\"6.12.94\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.19\",\"lessThan\":\"6.18.36\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.19.9\",\"lessThan\":\"6.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/core/pcm_native.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.253\",\"versionEndExcluding\":\"5.10.259\",\"matchCriteriaId\":\"5541328A-E6C3-4874-90F7-CDBC4AF38856\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.167\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"EA4D47D7-0677-4EA5-A70C-E66CDE321414\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.130\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"14572CC6-714F-49EE-BF85-5324A97BD777\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:32:56+00:00",
      "cve": "CVE-2026-53242",
      "id": "CVE-2026-53242",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53242.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T02:38:25Z",
      "cve": "CVE-2026-53242",
      "id": "CVE-2026-53242",
      "initial_release_date": "2026-06-26T02:08:56Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "538",
      "product_status:known_not_affected": "128",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53242",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53242.json",
      "version": "11"
    }
  }
}