CVE-2026-98246 (GCVE-0-2026-98246)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-06 08:45
VLAI
Title
Bluetooth: hci_sync: Serialize local codec list cleanup
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Serialize local codec list cleanup hci_dev_close_sync() clears hdev->local_codecs after releasing hdev->lock. Codec list additions and both traversals in sco_sock_getsockopt() use that lock, but the close path does not. A close and BT_CODEC query can therefore interleave as follows: hci_dev_close_sync() sco_sock_getsockopt() hci_dev_lock() fetch codec entry hci_codec_list_clear() kfree(entry) read entry->id The reader then accesses an entry which the close path has freed. KASAN BUG: KASAN: slab-use-after-free in sco_sock_getsockopt+0xfa0/0xfe0 Read of size 1 at addr ffff8881001c3450 Call Trace: sco_sock_getsockopt+0xfa0/0xfe0 do_sock_getsockopt+0x537/0x7b0 __sys_getsockopt+0xf2/0x170 Allocated by task 92: hci_codec_list_add.isra.0+0x2c/0x440 hci_read_codec_capabilities+0x224/0x590 hci_read_supported_codecs+0x2c2/0x640 Freed by task 92: kfree+0x131/0x3c0 hci_codec_list_clear+0xd8/0x160 hci_dev_close_sync+0x92a/0xfa0 Take hdev->lock around the clear operation at its existing point in the close path. This makes the clear wait for active readers and prevents a new traversal until the list is empty without changing teardown ordering.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6633 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 626535077ba9dc110787540d1fe24881094c15a1 , < 9f407d52c0d881430d689836d3e7d32aa36f98b5 (git)
Affected: b938790e70540bf4f2e653dcd74b232494d06c8f , < 560ed4373c06a58123ecdf9ad5ecaddc87a73382 (git)
Affected: b938790e70540bf4f2e653dcd74b232494d06c8f , < 1ee0c5429dc4a92879bda2554b1bfd4abc6c587c (git)
Affected: b938790e70540bf4f2e653dcd74b232494d06c8f , < 4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00 (git)
Affected: b938790e70540bf4f2e653dcd74b232494d06c8f , < 1276c2fafd18499769a28f96f45c5a76d6fc990e (git)
Affected: b938790e70540bf4f2e653dcd74b232494d06c8f , < 9a10987a2f160a44a638c9a35994ca6e3089696e (git)
Affected: eea5a8f0c3b7c884d2351e75fbdd0a3d7def5ae1 (git)
Affected: 6.1.57 , < 6.1.189 (semver)
Affected: 6.5.7 , < 6.6 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
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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\nBluetooth: hci_sync: Serialize local codec list cleanup\n\nhci_dev_close_sync() clears hdev-\u003elocal_codecs after releasing hdev-\u003elock.\nCodec list additions and both traversals in sco_sock_getsockopt() use that\nlock, but the close path does not. A close and BT_CODEC query can therefore\ninterleave as follows:\n\n  hci_dev_close_sync()          sco_sock_getsockopt()\n                                hci_dev_lock()\n                                fetch codec entry\n  hci_codec_list_clear()\n    kfree(entry)\n                                read entry-\u003eid\n\nThe reader then accesses an entry which the close path has freed. KASAN\n\n  BUG: KASAN: slab-use-after-free in sco_sock_getsockopt+0xfa0/0xfe0\n  Read of size 1 at addr ffff8881001c3450\n  Call Trace:\n   sco_sock_getsockopt+0xfa0/0xfe0\n   do_sock_getsockopt+0x537/0x7b0\n   __sys_getsockopt+0xf2/0x170\n  Allocated by task 92:\n   hci_codec_list_add.isra.0+0x2c/0x440\n   hci_read_codec_capabilities+0x224/0x590\n   hci_read_supported_codecs+0x2c2/0x640\n  Freed by task 92:\n   kfree+0x131/0x3c0\n   hci_codec_list_clear+0xd8/0x160\n   hci_dev_close_sync+0x92a/0xfa0\n\nTake hdev-\u003elock around the clear operation at its existing point in the\nclose path. This makes the clear wait for active readers and prevents a new\ntraversal until the list is empty without changing teardown ordering."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T08:45:15.411Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/560ed4373c06a58123ecdf9ad5ecaddc87a73382"
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        {
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        }
      ],
      "title": "Bluetooth: hci_sync: Serialize local codec list cleanup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98246",
    "datePublished": "2026-10-06T08:45:15.411Z",
    "dateReserved": "2026-09-25T10:25:14.330Z",
    "dateUpdated": "2026-10-06T08:45:15.411Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-10-09",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Serialize local codec list cleanup\n\nhci_dev_close_sync() clears hdev-\u003elocal_codecs after releasing hdev-\u003elock.\nCodec list additions and both traversals in sco_sock_getsockopt() use that\nlock, but the close path does not. A close and BT_CODEC query can therefore\ninterleave as follows:\n\n  hci_dev_close_sync()          sco_sock_getsockopt()\n                                hci_dev_lock()\n                                fetch codec entry\n  hci_codec_list_clear()\n    kfree(entry)\n                                read entry-\u003eid\n\nThe reader then accesses an entry which the close path has freed. KASAN\n\n  BUG: KASAN: slab-use-after-free in sco_sock_getsockopt+0xfa0/0xfe0\n  Read of size 1 at addr ffff8881001c3450\n  Call Trace:\n   sco_sock_getsockopt+0xfa0/0xfe0\n   do_sock_getsockopt+0x537/0x7b0\n   __sys_getsockopt+0xf2/0x170\n  Allocated by task 92:\n   hci_codec_list_add.isra.0+0x2c/0x440\n   hci_read_codec_capabilities+0x224/0x590\n   hci_read_supported_codecs+0x2c2/0x640\n  Freed by task 92:\n   kfree+0x131/0x3c0\n   hci_codec_list_clear+0xd8/0x160\n   hci_dev_close_sync+0x92a/0xfa0\n\nTake hdev-\u003elock around the clear operation at its existing point in the\nclose path. This makes the clear wait for active readers and prevents a new\ntraversal until the list is empty without changing teardown ordering."
          }
        ],
        "id": "CVE-2026-98246",
        "lastModified": "2026-10-06T09:18:12.783",
        "metrics": {},
        "published": "2026-10-06T09:18:12.783",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1276c2fafd18499769a28f96f45c5a76d6fc990e"
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            "url": "https://git.kernel.org/stable/c/9f407d52c0d881430d689836d3e7d32aa36f98b5"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-08T16:49:21Z",
      "cve": "CVE-2026-98246",
      "id": "CVE-2026-98246",
      "initial_release_date": "2026-10-08T16:49:21Z",
      "product_status:known_affected": "62",
      "product_status:known_not_affected": "285",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98246",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98246.json",
      "version": "2"
    }
  }
}



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