{"id":"CVE-2026-98246","title":"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->local_codecs after releasing hdev->lock.\nCodec list additions and both traver…","summary":"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->local_codecs after releasing hdev->lock.\nCodec list additions and both traver…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 626535077ba9dc110787540d1fe24881094c15a1 < 9f407d52c0d881430d689836d3e7d32aa36f98b5","Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f < 560ed4373c06a58123ecdf9ad5ecaddc87a73382","Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f < 1ee0c5429dc4a92879bda2554b1bfd4abc6c587c","Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f < 4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00","Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f < 1276c2fafd18499769a28f96f45c5a76d6fc990e","Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f < 9a10987a2f160a44a638c9a35994ca6e3089696e","Linux eea5a8f0c3b7c884d2351e75fbdd0a3d7def5ae1","Linux >= 6.1.57 < 6.1.189","Linux >= 6.5.7 < 6.6","Linux 6.6"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T09:18:12.783","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98246","references":[{"url":"https://git.kernel.org/stable/c/1276c2fafd18499769a28f96f45c5a76d6fc990e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1ee0c5429dc4a92879bda2554b1bfd4abc6c587c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/560ed4373c06a58123ecdf9ad5ecaddc87a73382","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9a10987a2f160a44a638c9a35994ca6e3089696e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9f407d52c0d881430d689836d3e7d32aa36f98b5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-06T08:50:17.431Z","slug":"CVE-2026-98246","body":"## Overview\n\nIn 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->local_codecs after releasing hdev->lock.\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->id\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->lock 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}