{"id":"CVE-2026-63871","state":"PUBLISHED","title":"Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls","description":"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_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","publishedAt":"2026-07-19T14:18:39.787Z","updatedAt":"2026-10-30T12:27:20.291Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c524f9561c657b8af26dd4f67092b8928261aa62","status":"affected","lessThan":"122b6a8b0c75b5f808aa6ea68e97103330b9ffa7","versionType":"git"},{"version":"241f51931c35085449502c10f64fb3ecd6e02171","status":"affected","lessThan":"9798f7d41d85ff763afd1f1cc0533b5c416c8348","versionType":"git"},{"version":"241f51931c35085449502c10f64fb3ecd6e02171","status":"affected","lessThan":"ab84fd7779a2a7ff5d2c8eac212c43733f56216e","versionType":"git"},{"version":"241f51931c35085449502c10f64fb3ecd6e02171","status":"affected","lessThan":"859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020","versionType":"git"},{"version":"241f51931c35085449502c10f64fb3ecd6e02171","status":"affected","lessThan":"9ca7053d6215d89c33f28893bfd1625a32919d3f","versionType":"git"},{"version":"6.1.9","status":"affected","lessThan":"6.1.191","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]}],"references":["https://git.kernel.org/stable/c/122b6a8b0c75b5f808aa6ea68e97103330b9ffa7","https://git.kernel.org/stable/c/9798f7d41d85ff763afd1f1cc0533b5c416c8348","https://git.kernel.org/stable/c/ab84fd7779a2a7ff5d2c8eac212c43733f56216e","https://git.kernel.org/stable/c/859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020","https://git.kernel.org/stable/c/9ca7053d6215d89c33f28893bfd1625a32919d3f"],"weaknesses":[],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63871.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63871","state":"PUBLISHED","datePublished":"2026-07-19T14:18:39.787Z","dateUpdated":"2026-10-30T12:27:20.291Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.017Z"},"containers":{"cna":{"title":"Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls","descriptions":[{"lang":"en","value":"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_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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c524f9561c657b8af26dd4f67092b8928261aa62","status":"affected","lessThan":"122b6a8b0c75b5f808aa6ea68e97103330b9ffa7","versionType":"git"},{"version":"241f51931c35085449502c10f64fb3ecd6e02171","status":"affected","lessThan":"9798f7d41d85ff763afd1f1cc0533b5c416c8348","versionType":"git"},{"version":"241f51931c35085449502c10f64fb3ecd6e02171","status":"affected","lessThan":"ab84fd7779a2a7ff5d2c8eac212c43733f56216e","versionType":"git"},{"version":"241f51931c35085449502c10f64fb3ecd6e02171","status":"affected","lessThan":"859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020","versionType":"git"},{"version":"241f51931c35085449502c10f64fb3ecd6e02171","status":"affected","lessThan":"9ca7053d6215d89c33f28893bfd1625a32919d3f","versionType":"git"},{"version":"6.1.9","status":"affected","lessThan":"6.1.191","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:27:20.291Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.9","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}