CVE-2026-63871

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: Jul 19, 2026
Source updated: Jul 19, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

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

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

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: unaffected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
241f51931c35085449502c10f64fb3ecd6e02171	`affected`	git	9798f7d41d85ff763afd1f1cc0533b5c416c8348	Unavailable	None listed
241f51931c35085449502c10f64fb3ecd6e02171	`affected`	git	ab84fd7779a2a7ff5d2c8eac212c43733f56216e	Unavailable	None listed
241f51931c35085449502c10f64fb3ecd6e02171	`affected`	git	859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020	Unavailable	None listed
241f51931c35085449502c10f64fb3ecd6e02171	`affected`	git	9ca7053d6215d89c33f28893bfd1625a32919d3f	Unavailable	None listed
c524f9561c657b8af26dd4f67092b8928261aa62	`affected`	git	Unavailable	Unavailable	None listed
6.1.9	`affected`	semver	6.2	Unavailable	None listed

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: affected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.2	`affected`	Unavailable	Unavailable	Unavailable	None listed
0	`unaffected`	semver	6.2	Unavailable	None listed
6.12.94	`unaffected`	semver	Unavailable	6.12.*	None listed
6.18.36	`unaffected`	semver	Unavailable	6.18.*	None listed
7.0.13	`unaffected`	semver	Unavailable	7.0.*	None listed
7.1	`unaffected`	original_commit_for_fix	Unavailable	*	None listed