CVE-2026-98260 Affecting kernel-uek-debug-modules package, versions <0:5.15.0-325.221.6.3.el8uek
Threat Intelligence
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Test your applications- Snyk IDSNYK-ORACLE8-KERNELUEKDEBUGMODULES-21136622
- published16 Oct 2026
- disclosed6 Oct 2026
Introduced: 6 Oct 2026
NewCVE-2026-98260 (opens in a new tab)How to fix?
Upgrade Oracle:8 kernel-uek-debug-modules to version 0:5.15.0-325.221.6.3.el8uek or higher.
This issue was patched in ELSA-2026-500395.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-uek-debug-modules package and not the kernel-uek-debug-modules package as distributed by Oracle.
See How to fix? for Oracle:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
exec: Cleanup POSIX timers right after de_thread()
A per-thread CPU timer holds a reference to the PID of the thread it is attached to and, while it is armed, its node is queued in that thread's posix_cputimers. The task is looked up by that PID.
When a non-leader thread exec()s, de_thread() changes which task owns that PID. pid_task(timer->it.cpu.pid, PIDTYPE_PID) then returns NULL, but the node is still queued on tsk, which is alive. timer_lock_sighand() takes a failed lookup to mean that the node is already dequeued, so it has nothing to undo.
begin_new_exec() calls posix_cpu_timers_exit(me) right after exec_task_namespaces() and that removes the leftover node, so the state normally stays invisible. But bprm->point_of_no_return is set before de_thread(), so if unshare_files(), set_mm_exe_file(), exec_mmap() or exec_task_namespaces() fails, the task dies before it gets there. exit_itimers() then frees the k_itimer while its node is still queued, and reaping tsk later erases that freed node from the rbtree.
In short:
the non-leader thread B the parent
timer_create(CLOCK_THREAD_CPUTIME_ID) timer_settime() arm_timer() // the node is queued on B execve() de_thread(B) exchange_tids(B, leader) // B's PID now belongs to the leader release_task(leader) __exit_signal(leader) posix_cpu_timers_exit(leader) // cleans leader's queue, not B's __unhash_process(leader) // that PID has no task anymore exec_mmap() mmap_read_lock_killable(old_mm) kill(B, SIGKILL) // -EINTR get_signal() do_exit() exit_itimers() posix_timer_delete() posix_cpu_timer_del() posix_timer_unhash_and_free() // freed while still queued wait4() release_task(B) posix_cpu_timers_exit(B) cleanup_timerqueue() timerqueue_del() // use-after-free
Move the POSIX timer cleanup right after de_thread() before any of the later failure conditions brings the task into do_exit().
[ tglx: Move the cleanup right after de_thread() ]
References
- https://linux.oracle.com/cve/CVE-2026-98260.html
- https://linux.oracle.com/errata/ELSA-2026-500394.html
- https://linux.oracle.com/errata/ELSA-2026-500395.html
- https://git.kernel.org/stable/c/6f1977cea3e85cd8ab55fb337d3e1725fe61d1ce
- https://git.kernel.org/stable/c/75aa08b93c65766040f9ca99f41ac85ad22596b6
- https://git.kernel.org/stable/c/acb03d3881818581052924a9bbbe92b8741ed448
- https://git.kernel.org/stable/c/d602877baf36c43c788a5f472c977e0be414029f
- https://git.kernel.org/stable/c/d9ae467e617ca29b825493a362bf0d75ad5f4ac3