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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-63871

Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls

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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 data-race on iso_pi fields in hci_get_route calls iso_connect_bis(), iso_connect_cis(), iso_listen_bis(), and iso_conn_big_sync() call hci_get_route() using iso_pi(sk)->dst, iso_pi(sk)->src, and iso_pi(sk)->src_type without holding lock_sock(). These fields may be modified concurrently by connect() or setsockopt() on the same socket, resulting in data-races reported by KCSAN. Fix this by snapshotting the required fields under lock_sock() before calling hci_get_route(). BUG: KCSAN: data-race in memcmp+0x45/0xb0 race at unknown origin, with read to 0xffff8880122135cf of 1 bytes by task 333 on cpu 1: memcmp+0x45/0xb0 hci_get_route+0x27e/0x490 iso_connect_cis+0x4c/0xa10 iso_sock_connect+0x60e/0xb30 __sys_connect_file+0xbd/0xe0 __sys_connect+0xe0/0x110 __x64_sys_connect+0x40/0x50 x64_sys_call+0xcad/0x1c60 do_syscall_64+0x133/0x590 entry_SYSCALL_64_after_hwframe+0x77/0x7f

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

  • c524f9561c657b8af26dd4f67092b8928261aa62 to < 122b6a8b0c75b5f808aa6ea68e97103330b9ffa7affected
  • 241f51931c35085449502c10f64fb3ecd6e02171 to < 9798f7d41d85ff763afd1f1cc0533b5c416c8348affected
  • 241f51931c35085449502c10f64fb3ecd6e02171 to < ab84fd7779a2a7ff5d2c8eac212c43733f56216eaffected
  • 241f51931c35085449502c10f64fb3ecd6e02171 to < 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020affected
  • 241f51931c35085449502c10f64fb3ecd6e02171 to < 9ca7053d6215d89c33f28893bfd1625a32919d3faffected
  • 6.1.9 to < 6.1.191affected

Linux Linux

Default version status: affected

  • 6.2affected
  • 0 to < 6.2unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.12.94 to ≤ 6.12.*unaffected
  • 6.18.36 to ≤ 6.18.*unaffected
  • 7.0.13 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References