CVE-2026-93070 (GCVE-0-2026-93070)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:05
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: media: ipu6: Do not free aux device pdata after init ipu6_bus_initialize_device() stores the isys/psys pdata pointer in struct ipu6_bus_device and initializes the auxiliary device. After that point, error unwinding must drop the auxiliary device reference and let ipu6_bus_release() free both the bus device and adev->pdata. The isys and psys init paths already call put_device() when MMU initialization fails, and ipu6_bus_add_device() calls auxiliary_device_uninit() on auxiliary_device_add() failure. Both paths therefore run the bus release callback. The extra kfree(pdata) in the callers can release the same object a second time. Remove the manual pdata frees after the auxiliary device has been initialized. This issue was found by a static analysis checker and confirmed by manual source review.
References
Impacted products
Vendor Product Version
Linux Linux Version: cb3117b074aefb0320d8d728a0a7f277a121adbd
Version: cb3117b074aefb0320d8d728a0a7f277a121adbd
Version: cb3117b074aefb0320d8d728a0a7f277a121adbd
Version: cb3117b074aefb0320d8d728a0a7f277a121adbd
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/pci/intel/ipu6/ipu6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "cb3117b074aefb0320d8d728a0a7f277a121adbd",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "cb3117b074aefb0320d8d728a0a7f277a121adbd",
              "versionType": "git"
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            {
              "lessThan": "7d102d1f0631807a491a140f67c9628dea85dfd2",
              "status": "affected",
              "version": "cb3117b074aefb0320d8d728a0a7f277a121adbd",
              "versionType": "git"
            },
            {
              "lessThan": "9be07216af4cfc4813e1a46ce26407d31ea845de",
              "status": "affected",
              "version": "cb3117b074aefb0320d8d728a0a7f277a121adbd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/pci/intel/ipu6/ipu6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: ipu6: Do not free aux device pdata after init\n\nipu6_bus_initialize_device() stores the isys/psys pdata pointer in\nstruct ipu6_bus_device and initializes the auxiliary device. After that\npoint, error unwinding must drop the auxiliary device reference and let\nipu6_bus_release() free both the bus device and adev-\u003epdata.\n\nThe isys and psys init paths already call put_device() when MMU\ninitialization fails, and ipu6_bus_add_device() calls\nauxiliary_device_uninit() on auxiliary_device_add() failure. Both paths\ntherefore run the bus release callback. The extra kfree(pdata) in the\ncallers can release the same object a second time.\n\nRemove the manual pdata frees after the auxiliary device has been\ninitialized.\n\nThis issue was found by a static analysis checker and confirmed by\nmanual source review."
        }
      ],
      "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 extra kfree(pdata) runs only in ipu6_isys_init()/ipu6_psys_init() after ipu6_bus_initialize_device(), called from ipu6_pci_probe() on Intel IPU6 PCI IDs (0x9a19/0x4e19/0x465d/0x462e/0xa75d/0x7d19). V4L2 ioctls and received packets never enter those error paths; this is a local PCI probe, not a network or USB protocol path.\nAC:L - After ipu6_mmu_init() fails, put_device() runs ipu6_bus_release() which kfree(adev-\u003epdata) before the extra kfree(pdata); ipu6_bus_add_device() does the same via auxiliary_device_uninit() when auxiliary_device_add() fails. Both double-frees then run with no race. A local attacker can induce those ENOMEM failures (alloc_dma_mapping()/device_add()) with allocation pressure.\nPR:L - ipu6_pci_probe() performs no capable() check. Sysfs bind/modprobe needs init-namespace admin, but probe already runs automatically: request_firmware() for isp-\u003ecpd_fw_name waits for userspace, and ipu_bridge_init() can return -EPROBE_DEFER until IVSC is ready then retry. An ordinary local user can apply memory pressure during that automatic probe, so Low is the higher defensible value.\nUI:N - The double-free occurs inside ipu6_pci_probe error unwinding in ipu6_isys_init()/ipu6_psys_init(); no mount, file open, or other victim action is required. PCI enumeration, firmware wait, and IVSC deferred retries are kernel/udev driven.\nS:U - kfree of the isys/psys pdata slab and the containing ipu6_bus_device corrupts host kernel heap in the same security authority as the IPU6 PCI driver. This is not a VM escape, IOMMU bypass, or sandbox boundary cross.\nC:H - ipu6_bus_release() already kfree(adev-\u003epdata) and kfree(adev); the extra kfree(pdata) is a SLUB double-free of ipu6_isys_pdata/ipu6_psys_pdata, and the MMU-fail path then reads isys_adev-\u003emmu after adev was freed. Reclaiming those slabs can disclose kernel memory.\nI:H - Double-free of pdata after ipu6_bus_release(), plus kfree of struct ipu6_bus_device on the MMU-fail put_device() path, yields two owners of one heap object. That overlapping allocation can corrupt live kernel structures and is exploitable for arbitrary writes or control-flow hijack, not merely a clean fail.\nA:H - The second kfree(pdata) after ipu6_bus_release() trips SLAB_FREELIST_HARDENED BUG_ON or corrupts the freelist, and the MMU-fail path dereferences the already-freed ipu6_bus_device via isys_adev-\u003emmu. Either produces a kernel oops or panic during probe unwind."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:05:06.091Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/faa1eb97f0e66bf122f44b62be6b323f86333e9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5323ed5a7bb2568191ec676b2035b0396105aa05"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d102d1f0631807a491a140f67c9628dea85dfd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/9be07216af4cfc4813e1a46ce26407d31ea845de"
        }
      ],
      "title": "media: ipu6: Do not free aux device pdata after init",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93070",
    "datePublished": "2026-09-17T16:10:54.393Z",
    "dateReserved": "2026-09-17T15:57:05.661Z",
    "dateUpdated": "2026-10-19T09:05:06.091Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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