CVE-2026-64485 (GCVE-0-2026-64485)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:56
VLAI
Title
ALSA: compress: Fix task creation error unwind
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: compress: Fix task creation error unwind snd_compr_task_new() allocates the driver task before validating the returned DMA buffers and reserving file descriptors. When either of those later steps fails, the core frees its task wrapper and DMA-buffer references without calling the driver's task_free() callback. Any driver resources allocated by task_create() are therefore leaked. The dual-fd allocation path also jumps to cleanup without storing the negative get_unused_fd_flags() result in retval. Since retval still contains the successful task_create() return value, TASK_CREATE can incorrectly report success although the task was discarded. Preserve the fd allocation errors and call task_free() when failure occurs after a successful task_create() callback.
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: 04177158cf98a79744937893b100020d77e6f9ac , < b27a75d42044d9d4709095617730b91b1c4af423 (git)
Affected: 04177158cf98a79744937893b100020d77e6f9ac , < 426a9947a38d272d0e19c031658da68e31128667 (git)
Affected: 04177158cf98a79744937893b100020d77e6f9ac , < 4a60127debb9e370d6c0e22a307326b624a141f3 (git)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (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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{
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: compress: Fix task creation error unwind\n\nsnd_compr_task_new() allocates the driver task before validating the\nreturned DMA buffers and reserving file descriptors. When either of\nthose later steps fails, the core frees its task wrapper and DMA-buffer\nreferences without calling the driver\u0027s task_free() callback. Any\ndriver resources allocated by task_create() are therefore leaked.\n\nThe dual-fd allocation path also jumps to cleanup without storing the\nnegative get_unused_fd_flags() result in retval. Since retval still\ncontains the successful task_create() return value, TASK_CREATE can\nincorrectly report success although the task was discarded.\n\nPreserve the fd allocation errors and call task_free() when failure\noccurs after a successful task_create() callback."
        }
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            "baseSeverity": "HIGH",
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              "value": "AV:L - The vulnerable path requires opening the local ALSA compress accelerator device and issuing SET_PARAMS and TASK_CREATE ioctls; no network or physical-input path reaches it.\nAC:L - The attacker can deterministically exhaust its own file-descriptor table so descriptor allocation fails after task_create succeeds. No race or condition outside the attacker\u2019s control is required.\nPR:L - There are no capable(), ns_capable(), or authentication checks in this path, so an unprivileged user with ordinary access to the ASRC device node can trigger it.\nUI:N - The attacker alone can configure the stream, exhaust descriptors, issue TASK_CREATE, and close the stream. No separate victim action is required.\nS:U - The vulnerable ALSA driver and the affected kernel resources share the same security authority; kernel compromise is a conventional local privilege escalation.\nC:H - Skipping task_free leaves asrc-\u003epair[] referencing a driver object that stream close subsequently frees, producing an attacker-reclaimable UAF in interrupt and power-management paths. Reclaimed DMA-channel pointers can influence kernel control flow and expose arbitrary kernel data.\nI:H - The stale pair is used for writes through completion handling and for an indirect device_terminate_all call through its DMA-channel pointer. Heap reclamation can therefore provide memory-corruption and control-flow-hijacking primitives.\nA:H - The leak exhausts the finite ASRC contexts and exclusive DMA channels, persistently disabling the device. Dereferencing the stale pair during interrupt or suspend/resume handling can also cause a kernel oops, panic, or hang."
            }
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        "dateUpdated": "2026-08-17T04:56:32.502Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4a60127debb9e370d6c0e22a307326b624a141f3"
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      "title": "ALSA: compress: Fix task creation error unwind",
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    "cveId": "CVE-2026-64485",
    "datePublished": "2026-07-25T08:51:45.301Z",
    "dateReserved": "2026-07-19T15:36:31.791Z",
    "dateUpdated": "2026-08-17T04:56:32.502Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: compress: Fix task creation error unwind\n\nsnd_compr_task_new() allocates the driver task before validating the\nreturned DMA buffers and reserving file descriptors. When either of\nthose later steps fails, the core frees its task wrapper and DMA-buffer\nreferences without calling the driver\u0027s task_free() callback. Any\ndriver resources allocated by task_create() are therefore leaked.\n\nThe dual-fd allocation path also jumps to cleanup without storing the\nnegative get_unused_fd_flags() result in retval. Since retval still\ncontains the successful task_create() return value, TASK_CREATE can\nincorrectly report success although the task was discarded.\n\nPreserve the fd allocation errors and call task_free() when failure\noccurs after a successful task_create() callback."
          }
        ],
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        "lastModified": "2026-08-17T05:17:54.337",
        "metrics": {
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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      "cve": "CVE-2026-64485",
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      "product_status:known_affected": "184",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: ALSA: compress: Fix task creation error unwind",
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      "version": "3"
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      "cve": "CVE-2026-64485",
      "id": "CVE-2026-64485",
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      "product_status:known_not_affected": "298",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64485",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64485.json",
      "version": "5"
    }
  }
}



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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.



Related by attack behaviour

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.