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TI-2026-45770 Aliases CVE-2026-64206GHSA-4pqq-whjc-554c

Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock

Priority MEDIUM 40CWE-362Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock l2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for pending_rx_work. process_pending_rx() takes the same mutex, so teardown can deadlock against the worker it is flushing. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the l2cap_conn_ready() -> queue_work(..., &conn->pending_rx_work) submit path, the l2cap_conn_del() -> cancel_work_sync(&conn->pending_rx_work) teardown path, and the process_pending_rx() -> mutex_lock(&conn->lock) worker edge. Lockdep WARNING: possible circular locking dependency detected process_pending_rx+0x21/0x2a [vuln_msv] l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv] *** DEADLOCK *** Cancel pending_rx_work before taking conn->lock, matching the existing lock-before-drain ordering used for the two delayed works in the same teardown path. The pending_rx queue is still purged after the work has been cancelled and conn->lock has been acquired.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00252 16th percentileScored 2026-11-07
Fix Partial Linux (Linux): 3.16, 5.10.261, 5.15.212 +6Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux3.15.5 to before 3.163.16Patch availableCNA
LinuxLinux3.16 and later5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.39, 7.1.4, 7.2Patch availableCNA
  • Linux VendorLinux Affected 3.15.5 to before 3.16 Fixed in 3.16 Patch available CNA
  • Linux VendorLinux Affected 3.16 and later Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.39, 7.1.4, 7.2 Patch available CNA

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.15.5 to before 3.16; 3.16.1 to before 5.10.261; 5.11 to before 5.15.212; 5.16 to before 6.1.178; 6.2 to before 6.6.145; 6.7 to before 6.12.97; 6.13 to before 6.18.39; 6.19 to before 7.1.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.16:-:*:*:*:*:*:*3.16VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.16:rc3:*:*:*:*:*:*3.16 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.16:rc4:*:*:*:*:*:*3.16 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.16:rc5:*:*:*:*:*:*3.16 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.16:rc6:*:*:*:*:*:*3.16 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.16:rc7:*:*:*:*:*:*3.16 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:*7.2 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:*7.2 rc2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.15.5 to before 3.16; 3.16.1 to before 5.10.261; 5.11 to before 5.15.212; 5.16 to before 6.1.178; 6.2 to before 6.6.145; 6.7 to before 6.12.97; 6.13 to before 6.18.39; 6.19 to before 7.1.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.16:-:*:*:*:*:*:* Versions 3.16 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.16:rc3:*:*:*:*:*:* Versions 3.16 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.16:rc4:*:*:*:*:*:* Versions 3.16 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.16:rc5:*:*:*:*:*:* Versions 3.16 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.16:rc6:*:*:*:*:*:* Versions 3.16 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.16:rc7:*:*:*:*:*:* Versions 3.16 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* Versions 7.2 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:* Versions 7.2 rc2 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 3.16
  • Fix · CNA Linux (Linux) Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.39, 7.1.4, 7.2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64206
  2. 2026-10-03 Alias added: GHSA-4pqq-whjc-554c
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-16 Priority changed: LOW → MEDIUM
  5. 2026-10-19 Weakness changed · CISA ADP
  6. 2026-10-21 Priority changed: MEDIUM → LOW
  7. 2026-10-25 Priority changed: LOW → MEDIUM

References

Patch 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences