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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-74533

Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero hci_conn::iso_data is accessed and modified without lock or RCU. This leads to a race [Task hdev->workqueue] [Task 2] iso_recv iso_conn_put(conn) conn = LOAD hcon->iso_data iso_conn_free(conn) iso_conn_hold_unless_zero(conn) hcon->iso_data = NULL kfree(conn) kref_get_unless_zero(&conn->ref) /* UAF */ and also to races in iso_conn_add() vs. iso_conn_free(). Fix by adding spinlock hci_conn::proto_lock and using it to guard hci_conn::iso_data.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • a58d0f5dac322e16cc75334d000666512341bde5 to < 08ac98f18c8d24cc037858dd6fba2670155e4e84affected
  • dc26097bdb864a0d5955b9a25e43376ffc1af99b to < 876a3e94c70d0859d1dad1c986112d4f0d99eba8affected
  • dc26097bdb864a0d5955b9a25e43376ffc1af99b to < af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9caffected
  • f53e7489273dc2bb307bf50f319b3762d45534f0affected
  • 6.12.2 to < 6.12.114affected
  • 6.11.11 to < 6.12affected

Linux Linux

Default version status: affected

  • 6.13affected
  • 0 to < 6.13unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 7.1.8 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References