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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63871
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 15:16:54 UTC
Updated2026-07-19 15:16:54 UTC
DescriptionIn 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

Risk And Classification

EPSS: 0.001570000 probability, percentile 0.052630000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 241f51931c35085449502c10f64fb3ecd6e02171 9798f7d41d85ff763afd1f1cc0533b5c416c8348 git Not specified
CNA Linux Linux affected 241f51931c35085449502c10f64fb3ecd6e02171 ab84fd7779a2a7ff5d2c8eac212c43733f56216e git Not specified
CNA Linux Linux affected 241f51931c35085449502c10f64fb3ecd6e02171 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020 git Not specified
CNA Linux Linux affected 241f51931c35085449502c10f64fb3ecd6e02171 9ca7053d6215d89c33f28893bfd1625a32919d3f git Not specified
CNA Linux Linux affected c524f9561c657b8af26dd4f67092b8928261aa62 git Not specified
CNA Linux Linux affected 6.1.9 6.2 semver Not specified
CNA Linux Linux affected 6.2 Not specified
CNA Linux Linux unaffected 6.2 semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9ca7053d6215d89c33f28893bfd1625a32919d3f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ab84fd7779a2a7ff5d2c8eac212c43733f56216e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9798f7d41d85ff763afd1f1cc0533b5c416c8348 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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