FKIE_CVE-2026-89891

Vulnerability from fkie_nvd - Published: 2026-09-16 11:16 - Updated: 2026-09-16 11:16
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0782807552b6aff41b4656c6c9076a3231d3e79d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16cb1ee17e093175b4d9ae33202f68e5b108cca2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ed575b1991f68569eb589b7747d3bc26aa6a8a2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/20aacd87550be297dc39a3f9532dcfff91586510
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/20c2c65f3d9f7c278dc9750531d3201ac8bf78b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/826915b6b65e2d3251e7248ea54289a22d748c84
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da4b07da6281e39ce4c01e1227e036f3bf600e14
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-89891",
  "lastModified": "2026-09-16T11:16:57.740",
  "metrics": {},
  "published": "2026-09-16T11:16:57.740",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0782807552b6aff41b4656c6c9076a3231d3e79d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/16cb1ee17e093175b4d9ae33202f68e5b108cca2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1ed575b1991f68569eb589b7747d3bc26aa6a8a2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/20aacd87550be297dc39a3f9532dcfff91586510"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/20c2c65f3d9f7c278dc9750531d3201ac8bf78b7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/826915b6b65e2d3251e7248ea54289a22d748c84"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da4b07da6281e39ce4c01e1227e036f3bf600e14"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f61720346fdcc1a2deec59a2f6cbb0cc20d1dc18"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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