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CVE-2026-64601 (GCVE-0-2026-64601)

Vulnerability from cvelistv5 – Published: 2026-08-06 07:13 – Updated: 2026-08-17 04:58
VLAI
Title
ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission In capture_urb_complete(), usb_anchor_urb() is called on every completion callback, but the URB is already anchored from the initial submission in tascam_trigger_start(). Each redundant call corrupts the anchor's doubly-linked list and inflates the URB refcount. When usb_kill_anchored_urbs() traverses the list during stream stop / suspend / disconnect, the corrupted list leads to use-after-free. Remove the redundant usb_anchor_urb() from the resubmit path.
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: c1bb0c13e430623c26543baae5bb9ae21139db87 , < 16f14f55141d4c55c3f321f93c328fff7cd6860a (git)
Affected: c1bb0c13e430623c26543baae5bb9ae21139db87 , < ab1db64912428cdf06a4f9542e16e0575e9ad59f (git)
Affected: c1bb0c13e430623c26543baae5bb9ae21139db87 , < 5cff1529a2f9b3461a7f5a6e36a86682fc290534 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/usx2y/us144mkii_capture.c"
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          "vendor": "Linux",
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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: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission\n\nIn capture_urb_complete(), usb_anchor_urb() is called on every\ncompletion callback, but the URB is already anchored from the\ninitial submission in tascam_trigger_start(). Each redundant call\ncorrupts the anchor\u0027s doubly-linked list and inflates the URB\nrefcount. When usb_kill_anchored_urbs() traverses the list during\nstream stop / suspend / disconnect, the corrupted list leads to\nuse-after-free.\n\nRemove the redundant usb_anchor_urb() from the resubmit path."
        }
      ],
      "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 bug is reached through local ALSA PCM open/ioctl paths on /dev/snd/pcmC*D* (START/STOP via tascam_pcm_trigger), not via network protocols; a present TASCAM US-144/US-144MKII is a deployment prerequisite, and Local is chosen over Physical under the uncertainty rule.\nAC:L - An attacker who can open the PCM device can deterministically start capture (submitting URBs that complete and hit capture_urb_complete), then stop/suspend to invoke usb_kill_anchored_urbs on the corrupted anchor; no conditions outside attacker control are required.\nPR:L - The PCM path has no capability checks; ordinary local access to ALSA device nodes (audio group or seat/udev ACLs on studio/desktop systems with this interface) is sufficient, not init-namespace root.\nUI:N - The attacker alone opens the PCM device, starts and stops the stream, and thereby triggers URB resubmission corruption and the subsequent kill/UAF path without any separate victim action.\nS:U - The use-after-free corrupts kernel USB/ALSA state within the same host kernel security authority and does not cross a VM, IOMMU, or other separate boundary.\nC:H - Corrupted usb_anchor list traversal during usb_kill_anchored_urbs yields a kernel use-after-free; per guidance UAF enables reclaim of freed objects and arbitrary kernel information disclosure.\nI:H - The same UAF on URB/anchor-linked objects can be turned into heap reuse and control-flow hijacking primitives, so integrity impact is High rather than a mere crash.\nA:H - Traversing the corrupted anchor list or under-referenced URB state during stream stop, suspend, or disconnect can oops/panic the kernel, giving High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:58:24.207Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/16f14f55141d4c55c3f321f93c328fff7cd6860a"
        },
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          "url": "https://git.kernel.org/stable/c/ab1db64912428cdf06a4f9542e16e0575e9ad59f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5cff1529a2f9b3461a7f5a6e36a86682fc290534"
        }
      ],
      "title": "ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64601",
    "datePublished": "2026-08-06T07:13:53.926Z",
    "dateReserved": "2026-07-19T15:36:31.799Z",
    "dateUpdated": "2026-08-17T04:58:24.207Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-20",
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      "percentile": "0.02447"
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                "programFiles": [
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission\n\nIn capture_urb_complete(), usb_anchor_urb() is called on every\ncompletion callback, but the URB is already anchored from the\ninitial submission in tascam_trigger_start(). Each redundant call\ncorrupts the anchor\u0027s doubly-linked list and inflates the URB\nrefcount. When usb_kill_anchored_urbs() traverses the list during\nstream stop / suspend / disconnect, the corrupted list leads to\nuse-after-free.\n\nRemove the redundant usb_anchor_urb() from the resubmit path."
          }
        ],
        "id": "CVE-2026-64601",
        "lastModified": "2026-08-17T05:18:06.800",
        "metrics": {
          "cvssMetricV31": [
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              "cvssData": {
                "attackComplexity": "LOW",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-08-06T08:16:35.797",
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            "url": "https://git.kernel.org/stable/c/16f14f55141d4c55c3f321f93c328fff7cd6860a"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5cff1529a2f9b3461a7f5a6e36a86682fc290534"
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        "vulnStatus": "Received"
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-17T16:30:39Z",
      "cve": "CVE-2026-64601",
      "id": "CVE-2026-64601",
      "initial_release_date": "2026-08-06T23:55:24Z",
      "product_status:known_not_affected": "296",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64601",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64601.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.