CVE-2026-93070 (GCVE-0-2026-93070)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-10-19 09:05
VLAI
Title
media: ipu6: Do not free aux device pdata after init
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6638 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cb3117b074aefb0320d8d728a0a7f277a121adbd , < faa1eb97f0e66bf122f44b62be6b323f86333e9f (git)
Affected: cb3117b074aefb0320d8d728a0a7f277a121adbd , < 5323ed5a7bb2568191ec676b2035b0396105aa05 (git)
Affected: cb3117b074aefb0320d8d728a0a7f277a121adbd , < 7d102d1f0631807a491a140f67c9628dea85dfd2 (git)
Affected: cb3117b074aefb0320d8d728a0a7f277a121adbd , < 9be07216af4cfc4813e1a46ce26407d31ea845de (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
            "drivers/media/pci/intel/ipu6/ipu6.c"
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          "vendor": "Linux",
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              "operator": "OR"
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      "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": [
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            "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."
            }
          ]
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/faa1eb97f0e66bf122f44b62be6b323f86333e9f"
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          "url": "https://git.kernel.org/stable/c/5323ed5a7bb2568191ec676b2035b0396105aa05"
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          "url": "https://git.kernel.org/stable/c/7d102d1f0631807a491a140f67c9628dea85dfd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/9be07216af4cfc4813e1a46ce26407d31ea845de"
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    "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"
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            "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."
          }
        ],
        "id": "CVE-2026-93070",
        "lastModified": "2026-10-19T10:16:56.913",
        "metrics": {
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
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                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "published": "2026-09-17T17:18:00.863",
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      "current_release_date": "2026-11-06T01:53:24+00:00",
      "cve": "CVE-2026-93070",
      "id": "CVE-2026-93070",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "202",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: ipu6: Do not free aux device pdata after init",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93070.json",
      "version": "3"
    }
  }
}



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