CVE-2026-63871
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 versions
Linux kernel versions
6.1.9,
6.2
and later are affected. Fixed in
6.12.94,
6.18.36,
7.0.13,
7.1
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-63871?
CVE-2026-63871 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.1.9 onward and has been patched in 6.12.94, 6.18.36, 7.0.13 and others. CVE-2026-63871 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-63871?
Yes — CVE-2026-63871 has been patched. Fixed versions include 6.12.94, 6.18.36, 7.0.13 and others. If you are running Linux kernel 6.1.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-63871 actively exploited?
No — CVE-2026-63871 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.