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i3c: master: Fix info leak and UAF in device unregister path

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: i3c: master: Fix info leak and UAF in device unregister path i3c_master_unregister_i3c_devs() clears i3cdev->dev->desc before calling device_unregister(). During device_unregister(), device_del() emits a KOBJ_REMOVE uevent and unbinds the driver while the device descriptor is still expected to be valid. As a result, i3c_device_uevent() and a racing modalias_show() can observe a NULL desc and fall back to an uninitialized stack struct i3c_device_info, leaking kernel stack contents in the generated modalias. Driver .remove() callbacks may also encounter an unexpected NULL desc during unbind. Keep desc valid until device_unregister() has completed. Since device_unregister() drops the device reference and may free the device, take an extra reference with get_device() before unregistering. Clear desc afterwards and release the extra reference with put_device(). This preserves the release-time invariant that desc must be NULL while avoiding both the information leak and a potential use-after-free from writing desc after the device has been released.

Announced Source revision 1
Original source ↗

CVE-2026-80952

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-2026-80952

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": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
        "lessThan": "334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
        "lessThan": "109995153898454c7795c2c299fd0a0b57456a4b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
        "lessThan": "c64daaaba08e490c8347ff60aacac4dd51249f91",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
        "lessThan": "ef72ff6650c4ebf2b444708d84df66db42f262d9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
        "lessThan": "c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
        "lessThan": "94fb9786d67a8f8b899e77381620f86bad94fdf7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
        "lessThan": "4837be0f9ac2efe5e83b35a696b6242c473d280c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0",
        "lessThan": "d2c743efd2d1ee64e94324664808f623dd865872",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/i3c/master.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/i3c/master.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80952

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34910 · Revision 1
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Publisher date
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