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TI-2026-52086 Aliases CVE-2026-74302GHSA-78xg-w78v-wc27

Bluetooth: hci_core: Fix UAF in hci_unregister_dev()

Priority LOW 35Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
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: hci_core: Fix UAF in hci_unregister_dev() hci_unregister_dev() does not disable cmd_timer and ncmd_timer before the hci_dev structure is freed. If a timeout fires during device teardown, the callback dereferences freed memory (including the hdev->reset function pointer), leading to a use-after-free. Add disable_delayed_work_sync() calls alongside the existing disable_work_sync() calls to ensure both timers are fully quiesced before teardown proceeds.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00126 2nd percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.191, 6.6.160, 4.20 +8Red 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
LinuxLinux6.1.101 to before 6.1.191; 6.6.42 to before 6.6.160; 4.19.319 to before 4.20; 5.4.281 to before 5.5; 5.10.223 to before 5.11; 5.15.164 to before 5.16; 6.9.11 to before 6.106.1.191, 6.6.160, 4.20, 5.5, 5.11, 5.16, 6.10Patch availableCNA
LinuxLinux6.10 and later6.1.191, 6.6.160, 6.12.97, 6.18.40, 7.1.5, 7.2Patch availableCNA
  • Linux VendorLinux Affected 6.1.101 to before 6.1.191; 6.6.42 to before 6.6.160; 4.19.319 to before 4.20; 5.4.281 to before 5.5; 5.10.223 to before 5.11; 5.15.164 to before 5.16; 6.9.11 to before 6.10 Fixed in 6.1.191, 6.6.160, 4.20, 5.5, 5.11, 5.16, 6.10 Patch available CNA
  • Linux VendorLinux Affected 6.10 and later Fixed in 6.1.191, 6.6.160, 6.12.97, 6.18.40, 7.1.5, 7.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 4.20, 5.5, 5.11, 5.16, 6.10
  • Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.97, 6.18.40, 7.1.5, 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
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix yet
Not affected: 3 products
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-74302
  2. 2026-10-03 Alias added: GHSA-78xg-w78v-wc27
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-21 Fix available: Linux/[email protected], Linux/Linux@bce2eec05bce548b548aca52c1834540f97d5d60 · CNA
  5. 2026-10-21 1 new reference · CNA
  6. 2026-10-29 Affected versions changed · Red Hat
  7. 2026-10-30 Affected versions changed · Red Hat
  8. 2026-10-30 CVSS score changed · Red Hat
  9. 2026-10-30 Fix available: Linux/[email protected], Linux/Linux@c277f624cd99e4f0e0223fd039b7615feea4afdc · CNA
  10. 2026-10-30 1 new reference · CNA

References

Other 6

  • 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-2021-02452 Incorrect authorization in Ubuntu linux kernel 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
See all 21727 →

Sources

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