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ALSA: us122l: Prevent write upgrades for read mappings

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Prevent write upgrades for read mappings The hwdep mmap callback rejects read-buffer mappings that are initially writable, but leaves VM_MAYWRITE set on mappings created with PROT_READ. A process that can open the hwdep node O_RDWR can later use mprotect() to make the mapping writable. The read allocation begins with struct usb_stream. Its read_size member is used by the fault handler to decide which pages belong to the read buffer. The read VMA intentionally remains expandable because pcm_usb_stream uses mremap() after reading that size. Changing read_size first can therefore map and access pages beyond the allocation. The same member is also consumed by usb_stream_free(), where changing it can make free_pages_exact() release pages outside the allocation. Clear VM_MAYWRITE for read-buffer mappings after rejecting an initially writable VMA. This keeps the separate output-buffer mapping writable while preventing later permission upgrades.

Announced Source revision 1
Original source ↗

CVE-2026-97931

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-97931

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
        "lessThan": "cbc1f954ce67d739d41d1f0757d29850353ebb6a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
        "lessThan": "becb89036a1320ef0a77da2d27935ac0704345c4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
        "lessThan": "6a5f5a5a32c78e67701f1d0f26bc87af68895604",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
        "lessThan": "938e8d6cee8d36f24669dfdcd3717e081eb32d64",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
        "lessThan": "64a87950239867682cde128020e1a47088295e5c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
        "lessThan": "d9c537b14f4982f17b103e3a2cfeee4bee6bc026",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
        "lessThan": "0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
        "lessThan": "71c610aeb1770302ac9c9e0b9a4ecd37f1311928",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "sound/usb/usx2y/us122l.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.28"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.28",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "sound/usb/usx2y/us122l.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97931

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38079 · Revision 1
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Publisher date
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