CVE-2026-80952 (GCVE-0-2026-80952)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0
Version: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0
Version: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0
Version: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0
Version: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0
Version: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0
Version: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0
Version: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/i3c/master.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/i3c/master.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.221",
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                  "vulnerable": true
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                  "versionEndExcluding": "6.1.188",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
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                {
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                {
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                {
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                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: master: Fix info leak and UAF in device unregister path\n\ni3c_master_unregister_i3c_devs() clears i3cdev-\u003edev-\u003edesc before\ncalling device_unregister().  During device_unregister(),\ndevice_del() emits a KOBJ_REMOVE uevent and unbinds the driver while\nthe device descriptor is still expected to be valid.  As a result,\ni3c_device_uevent() and a racing modalias_show() can observe a NULL\ndesc and fall back to an uninitialized stack struct i3c_device_info,\nleaking kernel stack contents in the generated modalias.  Driver\n.remove() callbacks may also encounter an unexpected NULL desc during\nunbind.\n\nKeep desc valid until device_unregister() has completed.  Since\ndevice_unregister() drops the device reference and may free the device,\ntake an extra reference with get_device() before unregistering.  Clear\ndesc afterwards and release the extra reference with put_device().\nThis preserves the release-time invariant that desc must be NULL while\navoiding both the information leak and a potential use-after-free from\nwriting desc after the device has been released."
        }
      ],
      "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 in i3c_master_unregister_i3c_devs(), reached only from I3C master platform/PCI driver .remove() (sysfs unbind, rmmod, or controller teardown). No network, Bluetooth, or remote packet path enters this unregister sequence.\nAC:L - Clearing desc before device_unregister() deterministically poisons KOBJ_REMOVE uevent/modalias, and the later device free races with in-flight IBI work still holding desc-\u003edev. An attacker looping bind/unbind while sensors generate IBIs or while reading sysfs modalias controls both sides of the race.\nPR:L - Per CNA driver-removal UAF precedent (including CVE-2024-49874 on this same i3c_master_unregister path), an unprivileged local user can drive the IBI/sysfs side via world-readable I3C modalias and IIO/hwmon/MCTP clients while teardown proceeds; init-namespace root is not the minimum privilege bar.\nUI:N - No separate victim action is required; the attacker reads sysfs/uevents and/or sustains I3C IBI traffic themselves and piggybacks on driver removal without another user opening files or mounting filesystems.\nS:U - Impact is kernel heap use-after-free and stack disclosure within the host kernel. This is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - i3c_device_uevent() and a racing modalias_show() leak uninitialized kernel stack into MODALIAS when desc is NULL. After device_unregister() drops the last reference, i3c_master_handle_ibi() can invoke the IBI handler with a freed i3c_device, a heap UAF that enables arbitrary kernel read.\nI:H - In-flight i3c_master_handle_ibi() still calls ibi-\u003ehandler() on the dangling i3c_device after it is freed, and driver .remove() may skip i3c_device_disable_ibi() because desc was already cleared. Heap reuse of that object yields write and control-flow hijack primitives.\nA:H - Use-after-free of the i3c_device during unregister, and unexpected NULL desc in driver .remove() callbacks, can oops or panic the kernel even when the UAF is not fully exploited for code execution."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:45:36.170Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e"
        },
        {
          "url": "https://git.kernel.org/stable/c/109995153898454c7795c2c299fd0a0b57456a4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/c64daaaba08e490c8347ff60aacac4dd51249f91"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef72ff6650c4ebf2b444708d84df66db42f262d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49"
        },
        {
          "url": "https://git.kernel.org/stable/c/94fb9786d67a8f8b899e77381620f86bad94fdf7"
        },
        {
          "url": "https://git.kernel.org/stable/c/4837be0f9ac2efe5e83b35a696b6242c473d280c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2c743efd2d1ee64e94324664808f623dd865872"
        }
      ],
      "title": "i3c: master: Fix info leak and UAF in device unregister path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80952",
    "datePublished": "2026-09-11T19:42:21.868Z",
    "dateReserved": "2026-08-26T14:34:25.804Z",
    "dateUpdated": "2026-10-19T08:45:36.170Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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