CVE-2026-63871

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

State: Published
Severity: Not scored
Published: Jul 19, 2026
Updated: Oct 30, 2026
Reserved: Jul 19, 2026

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

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c524f9561c657b8af26dd4f67092b8928261aa62 to before 122b6a8b0c75b5f808aa6ea68e97103330b9ffa7Affected 241f51931c35085449502c10f64fb3ecd6e02171 to before 9798f7d41d85ff763afd1f1cc0533b5c416c8348Affected 241f51931c35085449502c10f64fb3ecd6e02171 to before ab84fd7779a2a7ff5d2c8eac212c43733f56216eAffected 241f51931c35085449502c10f64fb3ecd6e02171 to before 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020Affected 241f51931c35085449502c10f64fb3ecd6e02171 to before 9ca7053d6215d89c33f28893bfd1625a32919d3fAffected 6.1.9 to before 6.1.191Affected
LinuxLinux	6.2Affected before 6.2Not affected 6.1.191 through 6.1.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

c524f9561c657b8af26dd4f67092b8928261aa62 to before 122b6a8b0c75b5f808aa6ea68e97103330b9ffa7Affected
241f51931c35085449502c10f64fb3ecd6e02171 to before 9798f7d41d85ff763afd1f1cc0533b5c416c8348Affected
241f51931c35085449502c10f64fb3ecd6e02171 to before ab84fd7779a2a7ff5d2c8eac212c43733f56216eAffected
241f51931c35085449502c10f64fb3ecd6e02171 to before 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020Affected
241f51931c35085449502c10f64fb3ecd6e02171 to before 9ca7053d6215d89c33f28893bfd1625a32919d3fAffected
6.1.9 to before 6.1.191Affected

LinuxLinux

6.2Affected
before 6.2Not affected
6.1.191 through 6.1.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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