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CVE-2026-80952 (GCVE-0-2026-80952)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59
VLAI
Title
i3c: master: Fix info leak and UAF in device unregister path
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.
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: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 , < 334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e (git)
Affected: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 , < 109995153898454c7795c2c299fd0a0b57456a4b (git)
Affected: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 , < c64daaaba08e490c8347ff60aacac4dd51249f91 (git)
Affected: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 , < ef72ff6650c4ebf2b444708d84df66db42f262d9 (git)
Affected: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 , < c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49 (git)
Affected: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 , < 94fb9786d67a8f8b899e77381620f86bad94fdf7 (git)
Affected: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 , < 4837be0f9ac2efe5e83b35a696b6242c473d280c (git)
Affected: 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 , < d2c743efd2d1ee64e94324664808f623dd865872 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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        {
          "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."
        }
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            "version": "3.1"
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              "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."
            }
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        {
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    "datePublished": "2026-09-11T19:42:21.868Z",
    "dateReserved": "2026-08-26T14:34:25.804Z",
    "dateUpdated": "2026-09-14T11:59:08.606Z",
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
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        "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."
          }
        ],
        "id": "CVE-2026-80952",
        "lastModified": "2026-09-14T13:18:50.710",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-11T20:19:00.927",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/109995153898454c7795c2c299fd0a0b57456a4b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/94fb9786d67a8f8b899e77381620f86bad94fdf7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c64daaaba08e490c8347ff60aacac4dd51249f91"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d2c743efd2d1ee64e94324664808f623dd865872"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ef72ff6650c4ebf2b444708d84df66db42f262d9"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T19:08:20+00:00",
      "cve": "CVE-2026-80952",
      "id": "CVE-2026-80952",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: i3c: master: Fix info leak and UAF in device unregister path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80952.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:05:37Z",
      "cve": "CVE-2026-80952",
      "id": "CVE-2026-80952",
      "initial_release_date": "2026-09-15T01:05:37Z",
      "product_status:known_affected": "176",
      "product_status:known_not_affected": "177",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80952",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80952.json",
      "version": "2"
    }
  }
}



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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.

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.


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.