CVE-2026-89891 (GCVE-0-2026-89891)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: em28xx: fix use-after-free of dev_next->devlist on disconnect When a device with has_dual_ts=1 is probed and the is_audio_only path is taken, both dev and dev->dev_next are added to the global em28xx_devlist via em28xx_init_extension(). However, during disconnect, em28xx_close_extension(dev) only calls list_del(&dev->devlist), leaving dev->dev_next->devlist still linked in the global list. When dev_next is subsequently freed via kref_put(), its devlist entry becomes a dangling pointer in em28xx_devlist. The next device probe that calls em28xx_init_extension() triggers a list corruption BUG when list_add_tail detects the freed node. This bug was exposed by commit a368ecde8a50 ("USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor") which clears reserved bits in bEndpointAddress during endpoint parsing. This causes fuzzed endpoint addresses like 0xf3 to be normalized to 0x83, which em28xx interprets as a vendor audio endpoint, enabling the is_audio_only + has_dual_ts code path that was previously unreachable with such descriptors. Fix this by removing dev->dev_next->devlist from the global list in em28xx_close_extension() before the device is freed.
References
Impacted products
Vendor Product Version
Linux Linux Version: f410b4093fdd4d8f4644d3d486afe3040eceef7b
Version: f410b4093fdd4d8f4644d3d486afe3040eceef7b
Version: f410b4093fdd4d8f4644d3d486afe3040eceef7b
Version: f410b4093fdd4d8f4644d3d486afe3040eceef7b
Version: f410b4093fdd4d8f4644d3d486afe3040eceef7b
Version: f410b4093fdd4d8f4644d3d486afe3040eceef7b
Version: f410b4093fdd4d8f4644d3d486afe3040eceef7b
Version: f410b4093fdd4d8f4644d3d486afe3040eceef7b
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/usb/em28xx/em28xx-core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18",
              "status": "affected",
              "version": "f410b4093fdd4d8f4644d3d486afe3040eceef7b",
              "versionType": "git"
            },
            {
              "lessThan": "1ed575b1991f68569eb589b7747d3bc26aa6a8a2",
              "status": "affected",
              "version": "f410b4093fdd4d8f4644d3d486afe3040eceef7b",
              "versionType": "git"
            },
            {
              "lessThan": "da4b07da6281e39ce4c01e1227e036f3bf600e14",
              "status": "affected",
              "version": "f410b4093fdd4d8f4644d3d486afe3040eceef7b",
              "versionType": "git"
            },
            {
              "lessThan": "20aacd87550be297dc39a3f9532dcfff91586510",
              "status": "affected",
              "version": "f410b4093fdd4d8f4644d3d486afe3040eceef7b",
              "versionType": "git"
            },
            {
              "lessThan": "20c2c65f3d9f7c278dc9750531d3201ac8bf78b7",
              "status": "affected",
              "version": "f410b4093fdd4d8f4644d3d486afe3040eceef7b",
              "versionType": "git"
            },
            {
              "lessThan": "0782807552b6aff41b4656c6c9076a3231d3e79d",
              "status": "affected",
              "version": "f410b4093fdd4d8f4644d3d486afe3040eceef7b",
              "versionType": "git"
            },
            {
              "lessThan": "16cb1ee17e093175b4d9ae33202f68e5b108cca2",
              "status": "affected",
              "version": "f410b4093fdd4d8f4644d3d486afe3040eceef7b",
              "versionType": "git"
            },
            {
              "lessThan": "826915b6b65e2d3251e7248ea54289a22d748c84",
              "status": "affected",
              "version": "f410b4093fdd4d8f4644d3d486afe3040eceef7b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/usb/em28xx/em28xx-core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "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": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "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": "5.10.270",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: em28xx: fix use-after-free of dev_next-\u003edevlist on disconnect\n\nWhen a device with has_dual_ts=1 is probed and the is_audio_only path\nis taken, both dev and dev-\u003edev_next are added to the global\nem28xx_devlist via em28xx_init_extension(). However, during disconnect,\nem28xx_close_extension(dev) only calls list_del(\u0026dev-\u003edevlist), leaving\ndev-\u003edev_next-\u003edevlist still linked in the global list. When dev_next is\nsubsequently freed via kref_put(), its devlist entry becomes a dangling\npointer in em28xx_devlist. The next device probe that calls\nem28xx_init_extension() triggers a list corruption BUG when list_add_tail\ndetects the freed node.\n\nThis bug was exposed by commit a368ecde8a50 (\"USB: core: Fix duplicate\nendpoint bug by clearing reserved bits in the descriptor\") which clears\nreserved bits in bEndpointAddress during endpoint parsing. This causes\nfuzzed endpoint addresses like 0xf3 to be normalized to 0x83, which\nem28xx interprets as a vendor audio endpoint, enabling the\nis_audio_only + has_dual_ts code path that was previously unreachable\nwith such descriptors.\n\nFix this by removing dev-\u003edev_next-\u003edevlist from the global list in\nem28xx_close_extension() before the device is freed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:54:24.249Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ed575b1991f68569eb589b7747d3bc26aa6a8a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/da4b07da6281e39ce4c01e1227e036f3bf600e14"
        },
        {
          "url": "https://git.kernel.org/stable/c/20aacd87550be297dc39a3f9532dcfff91586510"
        },
        {
          "url": "https://git.kernel.org/stable/c/20c2c65f3d9f7c278dc9750531d3201ac8bf78b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/0782807552b6aff41b4656c6c9076a3231d3e79d"
        },
        {
          "url": "https://git.kernel.org/stable/c/16cb1ee17e093175b4d9ae33202f68e5b108cca2"
        },
        {
          "url": "https://git.kernel.org/stable/c/826915b6b65e2d3251e7248ea54289a22d748c84"
        }
      ],
      "title": "media: em28xx: fix use-after-free of dev_next-\u003edevlist on disconnect",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89891",
    "datePublished": "2026-09-16T10:31:53.963Z",
    "dateReserved": "2026-09-11T19:38:34.773Z",
    "dateUpdated": "2026-10-19T08:54:24.249Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.