{"id":"CVE-2026-63871","title":"Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls\n\niso_connect_bis(), iso_connect_cis(), iso_listen_bis(), and\niso_conn_big_sync() call hci_get_rout…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c524f9561c657b8af26dd4f67092b8928261aa62 < 122b6a8b0c75b5f808aa6ea68e97103330b9ffa7","Linux >= 241f51931c35085449502c10f64fb3ecd6e02171 < 9798f7d41d85ff763afd1f1cc0533b5c416c8348","Linux >= 241f51931c35085449502c10f64fb3ecd6e02171 < ab84fd7779a2a7ff5d2c8eac212c43733f56216e","Linux >= 241f51931c35085449502c10f64fb3ecd6e02171 < 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020","Linux >= 241f51931c35085449502c10f64fb3ecd6e02171 < 9ca7053d6215d89c33f28893bfd1625a32919d3f","Linux >= 6.1.9 < 6.1.191","Linux 6.2"],"published":"2026-07-19","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:27:20.291Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63871","references":[{"url":"https://git.kernel.org/stable/c/122b6a8b0c75b5f808aa6ea68e97103330b9ffa7"},{"url":"https://git.kernel.org/stable/c/9798f7d41d85ff763afd1f1cc0533b5c416c8348"},{"url":"https://git.kernel.org/stable/c/ab84fd7779a2a7ff5d2c8eac212c43733f56216e"},{"url":"https://git.kernel.org/stable/c/859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020"},{"url":"https://git.kernel.org/stable/c/9ca7053d6215d89c33f28893bfd1625a32919d3f"}],"tags":["cve.org"],"epss":0.00166,"epssPercentile":0.05832,"ingestedAt":"2026-11-05T15:02:32.393Z","slug":"CVE-2026-63871","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls\n\niso_connect_bis(), iso_connect_cis(), iso_listen_bis(), and\niso_conn_big_sync() call hci_get_route() using iso_pi(sk)->dst,\niso_pi(sk)->src, and iso_pi(sk)->src_type without holding lock_sock().\n\nThese fields may be modified concurrently by connect() or setsockopt()\non the same socket, resulting in data-races reported by KCSAN.\n\nFix this by snapshotting the required fields under lock_sock() before\ncalling hci_get_route().\n\nBUG: KCSAN: data-race in memcmp+0x45/0xb0\n\nrace at unknown origin, with read to 0xffff8880122135cf of 1 bytes\nby task 333 on cpu 1:\n memcmp+0x45/0xb0\n hci_get_route+0x27e/0x490\n iso_connect_cis+0x4c/0xa10\n iso_sock_connect+0x60e/0xb30\n __sys_connect_file+0xbd/0xe0\n __sys_connect+0xe0/0x110\n __x64_sys_connect+0x40/0x50\n x64_sys_call+0xcad/0x1c60\n do_syscall_64+0x133/0x590\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n## Affected\n\n- `Linux >= c524f9561c657b8af26dd4f67092b8928261aa62 < 122b6a8b0c75b5f808aa6ea68e97103330b9ffa7`\n- `Linux >= 241f51931c35085449502c10f64fb3ecd6e02171 < 9798f7d41d85ff763afd1f1cc0533b5c416c8348`\n- `Linux >= 241f51931c35085449502c10f64fb3ecd6e02171 < ab84fd7779a2a7ff5d2c8eac212c43733f56216e`\n- `Linux >= 241f51931c35085449502c10f64fb3ecd6e02171 < 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020`\n- `Linux >= 241f51931c35085449502c10f64fb3ecd6e02171 < 9ca7053d6215d89c33f28893bfd1625a32919d3f`\n- `Linux >= 6.1.9 < 6.1.191`\n- `Linux 6.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}