CVE-2026-74530: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback
Greg Kroah-Hartman <[email protected]>
| Newsgroups | org.kernel.vger.linux-cve-announce |
|---|---|
| Message-ID | <2026081546-CVE-2026-74530-ee6f@gregkh> |
From: Greg Kroah-Hartman <[email protected]> Description =========== In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to match the previous behavior. The Linux kernel CVE team has assigned CVE-2026-74530 to this issue. Affected and fixed versions =========================== Issue introduced in 6.15 with commit 024421cf39923927ab2b5fe895d1d922b9abe67f and fixed in 7.1.8 with commit 2d91e6244b69d752503b2d44020d8b0e323dbd38 Issue introduced in 6.15 with commit 024421cf39923927ab2b5fe895d1d922b9abe67f and fixed in 7.2-rc6 with commit 56e78b670356caab0b607e8aad4cf819a1909d07 Issue introduced in 6.12.28 with commit 620810ac1f7f1133a9ac403e132b3ad6995ddf39 Issue introduced in 6.14.6 with commit ee0586ad64a805eaf1a9a10100e908627a561e34 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-74530 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/bluetooth/hci_sync.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/2d91e6244b69d752503b2d44020d8b0e323dbd38 https://git.kernel.org/stable/c/56e78b670356caab0b607e8aad4cf819a1909d07