CVE-2026-10681 SMP race in `thread_idx_alloc()` lets concurrent `k_object_alloc(K_OBJ_THREAD)` callers share a kernel-object permission slot

In Zephyr's userspace dynamic-objects subsystem, threadidxalloc in kernel/userspace/userspace.c allocated a new thread permission index from the global threadidxmap bitmap without holding listslock. On SMP systems, two user-mode threads invoking the kobjectallocKOBJTHREAD syscall concurrently can...

CVE-2026-10681

The CVE-2026-10681 issue affects Zephyr's userspace dynamic-objects subsystem. In thread_idx_alloc(), a new thread permission index is taken from _thread_idx_map[] without holding lists_lock. On SMP, concurrent k_object_alloc(K_OBJ_THREAD) calls can observe the same lowest free bit and perform a ...

CVE-2026-10667

Zephyr's dynamic kernel-object tracking kernel/userspace/userspace.c, formerly kernel/userspace.c maintains a doubly-linked list objlist of dynamically allocated kernel objects. Iteration over this list in kobjectwordlistforeach was performed under listslock using the SAFE iterator which caches t...

Moderate: Red Hat Security Advisory: kernel security and bug fix update

Updated kernel packages that fix two security issues and several bugs are now available for Red Hat Enterprise Linux 6.2 Extended Update Support. The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System CVSS base scores, whic...

RHEL 6 : kernel (RHSA-2012:0743)

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2012:0743 advisory. - kernel: drm: integer overflow in drmmodedirtyfbioctl CVE-2012-0044 - kernel: thp:splithugepage mapcount != pagemapcount BUGON CVE-2012-117...