Deadlock Affecting kernel-rt-core package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-RHEL10-KERNELRTCORE-20285927
- published30 Sept 2026
- disclosed25 Sept 2026
Introduced: 25 Sep 2026
NewCVE-2026-97619 (opens in a new tab)How to fix?
There is no fixed version for RHEL:10 kernel-rt-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-core package and not the kernel-rt-core package as distributed by RHEL.
See How to fix? for RHEL:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
io_uring/rw: end write accounting from ->ki_complete
Commit b000145e9907 moved both the fsnotify calls and the write accounting out of the kiocb completion handler and into the io_req_rw_complete() task_work. However, only the fsnotify part actually needed to move as it may sleep. Ending the write accounting is just a percpu_up_read() on the superblock writers sem.
Deferring it is a problem, because it makes dropping SB_FREEZE_WRITE protection depend on the ring owner getting to running task_work. But the task may be blocked in freeze_super(), causing it to never get to that:
task io-wq worker
io_write() io_kiocb_start_write() (takes sb_writers, hidden from lockdep by __sb_writers_release) write_iter() -> -EIOCBQUEUED ioctl(FS_IOC_SHUTDOWN) bdev_freeze() freeze_super() percpu_down_write() <- waits for the reader above io_write() kiocb_start_write() percpu_down_read() <- queued behind the writer <bio completes> io_complete_rw() queues io_req_rw_complete() <- never runs, task is in D state
End the write from io_complete_rw() instead, and leave only the fsnotify calls in task_work.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2541309
- https://access.redhat.com/security/cve/CVE-2026-97619
- https://git.kernel.org/stable/c/055d43a1233edbd80e558889258105ce63051bcd
- https://git.kernel.org/stable/c/796aa0547557e63338657ed1c487906f9fac4c73
- https://git.kernel.org/stable/c/cc580cee4dfa2ec9099c30ecbd4d804cbb996432