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CVE-2026-98246

Linux: Bluetooth: hci_sync: Serialize local codec list cleanup

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in9f407d52c0d881430d689836d3e7d32aa36f98b5Also 560ed4373c06a58123ecdf9ad5ecaddc87a73382, 1ee0c5429dc4a92879bda2554b1bfd4abc6c587c and 5 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 9f407d52c0d881430d689836d3e7d32aa36f98b5LinuxCVE List
  • 560ed4373c06a58123ecdf9ad5ecaddc87a73382LinuxCVE List
  • 1ee0c5429dc4a92879bda2554b1bfd4abc6c587cLinuxCVE List
  • 4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00LinuxCVE List
  • 1276c2fafd18499769a28f96f45c5a76d6fc990eLinuxCVE List
  • 9a10987a2f160a44a638c9a35994ca6e3089696eLinuxCVE List
Show all 8 fixed versions

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 17

  • Linuxaffected: 626535077ba9dc110787540d1fe24881094c15a1 before 9f407d52c0d881430d689836d3e7d32aa36f98b5CVE List
  • Linuxaffected: b938790e70540bf4f2e653dcd74b232494d06c8f before 560ed4373c06a58123ecdf9ad5ecaddc87a73382CVE List
  • Linuxaffected: b938790e70540bf4f2e653dcd74b232494d06c8f before 1ee0c5429dc4a92879bda2554b1bfd4abc6c587cCVE List
  • Linuxaffected: b938790e70540bf4f2e653dcd74b232494d06c8f before 4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00CVE List
  • Linuxaffected: b938790e70540bf4f2e653dcd74b232494d06c8f before 1276c2fafd18499769a28f96f45c5a76d6fc990eCVE List
  • Linuxaffected: b938790e70540bf4f2e653dcd74b232494d06c8f before 9a10987a2f160a44a638c9a35994ca6e3089696eCVE List
  • Linuxaffected: eea5a8f0c3b7c884d2351e75fbdd0a3d7def5ae1CVE List
  • Linuxaffected: 6.1.57 before 6.1.189CVE List
  • Linuxaffected: 6.5.7 before 6.6CVE List
  • Linuxaffected: 6.6CVE List
  • Linuxunaffected: all versions before 6.6CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 6