CVE-2022-49292 (GCVE-0-2022-49292)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:56 – Updated: 2026-08-05 08:54
VLAI
Title
ALSA: oss: Fix PCM OSS buffer allocation overflow
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: oss: Fix PCM OSS buffer allocation overflow We've got syzbot reports hitting INT_MAX overflow at vmalloc() allocation that is called from snd_pcm_plug_alloc(). Although we apply the restrictions to input parameters, it's based only on the hw_params of the underlying PCM device. Since the PCM OSS layer allocates a temporary buffer for the data conversion, the size may become unexpectedly large when more channels or higher rates is given; in the reported case, it went over INT_MAX, hence it hits WARN_ON(). This patch is an attempt to avoid such an overflow and an allocation for too large buffers. First off, it adds the limit of 1MB as the upper bound for period bytes. This must be large enough for all use cases, and we really don't want to handle a larger temporary buffer than this size. The size check is performed at two places, where the original period bytes is calculated and where the plugin buffer size is calculated. In addition, the driver uses array_size() and array3_size() for multiplications to catch overflows for the converted period size and buffer bytes.
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
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a63af1baf0a5e11827db60e3127f87e437cab6e5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0c4190b41a69990666b4000999e27f8f1b2a426b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5ce74ff7059341d8b2f4d01c3383491df63d1898 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7a40cbf3579a8e14849ba7ce46309c1992658d2b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fb08bf99195a87c798bc8ae1357337a981faeade (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e74a069c6a7bb505f3ade141dddf85f4b0b5145a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < efb6402c3c4a7c26d97c92d70186424097b6e366 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.19.237 , ≤ 4.19.* (semver)
Unaffected: 5.4.188 , ≤ 5.4.* (semver)
Unaffected: 5.10.109 , ≤ 5.10.* (semver)
Unaffected: 5.15.32 , ≤ 5.15.* (semver)
Unaffected: 5.16.18 , ≤ 5.16.* (semver)
Unaffected: 5.17.1 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The vulnerability is reached via open/ioctl/read/write on the local OSS PCM device nodes (/dev/dsp*), not via network packets or adjacent-link protocols.\nAC:L - An attacker who can open the OSS PCM device can reliably set high rates/channels/fragment parameters through SNDCTL_DSP_* ioctls and trigger snd_pcm_oss_change_params \u2192 snd_pcm_plug_alloc without depending on races or external state.\nPR:L - Exploitation requires only an unprivileged local account able to open the OSS PCM device (typically audio-group access); the open/ioctl path performs no capability checks and does not require root.\nUI:N - The attacker triggers the bug entirely through their own open/ioctl/I/O operations; no separate victim action is required.\nS:U - Impact is confined to the host kernel\u0027s memory/availability; this is standard local kernel memory corruption/DoS, not a VM/IOMMU/sandbox boundary crossing.\nC:H - Integer overflow in snd_pcm_plugin_alloc can wrap the allocation size so kvzalloc returns an undersized plugin buffer while buf_frames stays large, enabling heap out-of-bounds access that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same undersized plugin/OSS conversion buffer is written during format/rate/channel plugin transfers, producing a heap out-of-bounds write primitive that can be abused for corruption and code execution.\nA:H - Oversized non-wrapping sizes hit WARN_ON_ONCE(size \u003e INT_MAX) in kvmalloc_node (panic_on_warn \u2192 crash), and the heap corruption path can also oops/panic the kernel."
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Since the PCM OSS layer\\nallocates a temporary buffer for the data conversion, the size may\\nbecome unexpectedly large when more channels or higher rates is given;\\nin the reported case, it went over INT_MAX, hence it hits WARN_ON().\\n\\nThis patch is an attempt to avoid such an overflow and an allocation\\nfor too large buffers.  First off, it adds the limit of 1MB as the\\nupper bound for period bytes.  This must be large enough for all use\\ncases, and we really don\u0027t want to handle a larger temporary buffer\\nthan this size.  The size check is performed at two places, where the\\noriginal period bytes is calculated and where the plugin buffer size\\nis calculated.\\n\\nIn addition, the driver uses array_size() and array3_size() for\\nmultiplications to catch overflows for the converted period size and\\nbuffer bytes.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: oss: Fix PCM OSS buffer assignment overflow Tenemos informes de syzbot que alcanzan un desbordamiento de INT_MAX en la asignaci\u00f3n de vmalloc() que se llama desde snd_pcm_plug_alloc(). Aunque aplicamos las restricciones a los par\u00e1metros de entrada, se basa solo en hw_params del dispositivo PCM subyacente. Dado que la capa PCM OSS asigna un b\u00fafer temporal para la conversi\u00f3n de datos, el tama\u00f1o puede volverse inesperadamente grande cuando se dan m\u00e1s canales o velocidades m\u00e1s altas; en el caso informado, super\u00f3 INT_MAX, por lo tanto, alcanza WARN_ON(). Este parche es un intento de evitar dicho desbordamiento y una asignaci\u00f3n para b\u00faferes demasiado grandes. En primer lugar, agrega el l\u00edmite de 1 MB como l\u00edmite superior para bytes de per\u00edodo. Esto debe ser lo suficientemente grande para todos los casos de uso, y realmente no queremos manejar un b\u00fafer temporal m\u00e1s grande que este tama\u00f1o. La comprobaci\u00f3n del tama\u00f1o se realiza en dos lugares: donde se calculan los bytes del per\u00edodo original y donde se calcula el tama\u00f1o del b\u00fafer del complemento. Adem\u00e1s, el controlador utiliza array_size() y array3_size() para las multiplicaciones con el fin de detectar desbordamientos en el tama\u00f1o del per\u00edodo convertido y los bytes del b\u00fafer.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/core/oss/pcm_oss.c\",\"sound/core/oss/pcm_plugin.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"a63af1baf0a5e11827db60e3127f87e437cab6e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"0c4190b41a69990666b4000999e27f8f1b2a426b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5ce74ff7059341d8b2f4d01c3383491df63d1898\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"7a40cbf3579a8e14849ba7ce46309c1992658d2b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"fb08bf99195a87c798bc8ae1357337a981faeade\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e74a069c6a7bb505f3ade141dddf85f4b0b5145a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"efb6402c3c4a7c26d97c92d70186424097b6e366\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/core/oss/pcm_oss.c\",\"sound/core/oss/pcm_plugin.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.237\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.188\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.109\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.32\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16.18\",\"lessThanOrEqual\":\"5.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.17.1\",\"lessThanOrEqual\":\"5.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.18\",\"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},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"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-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.19.237\",\"matchCriteriaId\":\"917826D9-6AD8-4E95-A09E-944D011A1B3B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.188\",\"matchCriteriaId\":\"670BCB59-E3C8-496D-BD17-297C113776FA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.109\",\"matchCriteriaId\":\"F3E1A428-8D87-4CD4-B9CA-C621B32933F8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.32\",\"matchCriteriaId\":\"3191B916-53BD-46E6-AE21-58197D35768E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.18\",\"matchCriteriaId\":\"C86410A0-E312-4F41-93E9-929EAFB31757\"},{\"vulnerable\":true,\"criteria\":\"cpe: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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:44:51+00:00",
      "cve": "CVE-2022-49292",
      "id": "CVE-2022-49292",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "286",
      "product_status:known_affected": "38",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: oss: Fix PCM OSS buffer allocation overflow",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49292.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-05T01:14:26Z",
      "cve": "CVE-2022-49292",
      "id": "CVE-2022-49292",
      "initial_release_date": "2025-02-27T03:09:19Z",
      "product_status:known_affected": "423",
      "product_status:known_not_affected": "151",
      "product_status:recommended": "375",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49292",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49292.json",
      "version": "59"
    }
  }
}



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Taxonomy of the tags.





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.

Sightings

Author Source Type Date Other

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.