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CVE-2026-98462

Linux: Bluetooth: hci_conn: fix CIS hold ownership on reuse

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)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10f959cb435217b4b407864e5be0eb779e389490Also 072bc8659f22566083f8eef7dc5903bbcaf7804a, 3ff5a8d949e3a2a435d0a5ee05074cd371b0158a and 1 moreCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 10f959cb435217b4b407864e5be0eb779e389490LinuxCVE List
  • 072bc8659f22566083f8eef7dc5903bbcaf7804aLinuxCVE List
  • 3ff5a8d949e3a2a435d0a5ee05074cd371b0158aLinuxCVE List
  • 947eb2f41f70d371eb16897ee4e8e32bff73b476LinuxCVE List

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_conn: fix CIS hold ownership on reuse

Commit 69997d50ec57 ("Bluetooth: ISO: handle bound CIS cleanup via hci_conn") made hci_bind_cis() and hci_connect_cis() return a connection with one hold for the ISO layer. hci_bind_cis() currently takes that hold only after configuring a CIS, so its BT_CONNECTED and matching BT_BOUND paths return a bare lookup result. Its configuration failure path can likewise call hci_conn_drop() before taking a hold.

Take the hold before any state-dependent return or configuration error so every successful return follows the documented ownership contract and every error drop is balanced.

hci_connect_cis() also assumes hci_conn_link() always takes a new CIS hold before dropping the one returned by hci_bind_cis(). However, the helper returns an existing link without taking another hold. In that case, preserve the CIS hold for the caller and drop the redundant LE hold because the existing link already owns its parent hold. Returning early also avoids changing an existing CIS back to BT_CONNECT.

Text from CVE List

Affected versions 12

  • Linuxaffected: 69997d50ec574be816b4ee8f9cee52ebbd53f8bd before 10f959cb435217b4b407864e5be0eb779e389490CVE List
  • Linuxaffected: 69997d50ec574be816b4ee8f9cee52ebbd53f8bd before 072bc8659f22566083f8eef7dc5903bbcaf7804aCVE List
  • Linuxaffected: 69997d50ec574be816b4ee8f9cee52ebbd53f8bd before 3ff5a8d949e3a2a435d0a5ee05074cd371b0158aCVE List
  • Linuxaffected: 69997d50ec574be816b4ee8f9cee52ebbd53f8bd before 947eb2f41f70d371eb16897ee4e8e32bff73b476CVE List
  • Linuxaffected: 69997d50ec574be816b4ee8f9cee52ebbd53f8bd before e06d549fcd4a0ba381ed67ddf1ab3c7a6ca4314cCVE List
  • Linuxaffected: 6.6CVE List
  • Linuxunaffected: all versions before 6.6CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5