CVE-2026-80764 (GCVE-0-2026-80764)
Vulnerability from cvelistv5
Published
2026-09-04 15:12
Modified
2026-09-04 15:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix LE list UAF on reset hci_cc_reset() clears the LE accept and resolving lists without taking hdev->lock. Other command-complete handlers serialize updates to these lists with that lock, and the debugfs readers hold it while walking them. This permits the reset completion and a debugfs read to interleave as follows: hci_rx_work debugfs reader ----------- -------------- lock hdev->lock fetch current entry list_del(entry) kfree(entry) read entry fields The reader then dereferences a freed list entry and may follow its stale next pointer. KASAN reported: BUG: KASAN: slab-use-after-free in white_list_show+0x15f/0x180 Read of size 1 at addr ffff8881015dab16 by task poc/95 Call Trace: white_list_show+0x15f/0x180 seq_read_iter+0x3ff/0x1190 seq_read+0x267/0x3d0 vfs_read+0x177/0xa20 ksys_read+0xf7/0x1c0 Allocated by task 91: hci_bdaddr_list_add+0x1a6/0x3a0 hci_cc_le_add_to_accept_list+0xab/0x140 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Freed by task 90: kfree+0x131/0x3c0 hci_bdaddr_list_clear+0xd8/0x160 hci_cc_reset+0x28a/0x370 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Take hdev->lock around both list clears. This matches the existing mutation and traversal locking convention.
References
Impacted products
Vendor Product Version
Linux Linux Version: a4d5504d5c39cc84f1f828e19967595597a8136e
Version: a4d5504d5c39cc84f1f828e19967595597a8136e
Version: a4d5504d5c39cc84f1f828e19967595597a8136e
Version: a4d5504d5c39cc84f1f828e19967595597a8136e
Version: a4d5504d5c39cc84f1f828e19967595597a8136e
Version: a4d5504d5c39cc84f1f828e19967595597a8136e
Version: a4d5504d5c39cc84f1f828e19967595597a8136e
Version: 0de8cd646b0152c9ddd10257d8284938d0df0181
Version: 3.18.3   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_event.c"
          ],
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          "vendor": "Linux",
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "3.19"
            },
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              "status": "unaffected",
              "version": "0",
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            },
            {
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              "status": "unaffected",
              "version": "6.1.185",
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            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.154",
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            },
            {
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              "status": "unaffected",
              "version": "6.12.106",
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            },
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              "status": "unaffected",
              "version": "6.18.47",
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            },
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              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.2.1",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: fix LE list UAF on reset\n\nhci_cc_reset() clears the LE accept and resolving lists without taking\nhdev-\u003elock. Other command-complete handlers serialize updates to these\nlists with that lock, and the debugfs readers hold it while walking them.\n\nThis permits the reset completion and a debugfs read to interleave as\nfollows:\n\n  hci_rx_work                 debugfs reader\n  -----------                 --------------\n                              lock hdev-\u003elock\n                              fetch current entry\n  list_del(entry)\n  kfree(entry)\n                              read entry fields\n\nThe reader then dereferences a freed list entry and may follow its stale\nnext pointer.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in white_list_show+0x15f/0x180\n  Read of size 1 at addr ffff8881015dab16 by task poc/95\n\n  Call Trace:\n   white_list_show+0x15f/0x180\n   seq_read_iter+0x3ff/0x1190\n   seq_read+0x267/0x3d0\n   vfs_read+0x177/0xa20\n   ksys_read+0xf7/0x1c0\n\n  Allocated by task 91:\n   hci_bdaddr_list_add+0x1a6/0x3a0\n   hci_cc_le_add_to_accept_list+0xab/0x140\n   hci_cmd_complete_evt+0x26c/0x9a0\n   hci_event_packet+0x454/0xb20\n   hci_rx_work+0x293/0x730\n\n  Freed by task 90:\n   kfree+0x131/0x3c0\n   hci_bdaddr_list_clear+0xd8/0x160\n   hci_cc_reset+0x28a/0x370\n   hci_cmd_complete_evt+0x26c/0x9a0\n   hci_event_packet+0x454/0xb20\n   hci_rx_work+0x293/0x730\n\nTake hdev-\u003elock around both list clears. This matches the existing\nmutation and traversal locking convention."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:12:36.599Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8e68c380290b1dd64a0a512ce66d0264130c46ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/0628cc9b2fa29985a7b8c774741f8a736b0f5e7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d57702d4c55633c243da5a2fec37ae2ad4adb621"
        },
        {
          "url": "https://git.kernel.org/stable/c/39a3afb91be3cb465f46ce7a8e5696d9e33edf93"
        },
        {
          "url": "https://git.kernel.org/stable/c/b55e83a4ba31d40deae22d4e4dc8c84083e953c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/25b05e3ce31d954540e99954bcc66cbceb27ab35"
        },
        {
          "url": "https://git.kernel.org/stable/c/33af47e847fe4a28b109673affb5874015d54f5a"
        }
      ],
      "title": "Bluetooth: hci_event: fix LE list UAF on reset",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80764",
    "datePublished": "2026-09-04T15:12:36.599Z",
    "dateReserved": "2026-08-26T14:34:25.791Z",
    "dateUpdated": "2026-09-04T15:12:36.599Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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