CVE-2026-97619
UnknownSummary
A vulnerability was found in the Linux kernel's io_uring/rw subsystem. Moving write accounting completion to task_work causes a deadlock during filesystem freeze, as the task waits on the sb_writers semaphore. The fix moves write accounting completion back to the ki_complete handler, leaving only fsnotify calls in task_work.
Risk Assessment
An attacker could exploit this vulnerability to cause a kernel deadlock, leading to denial of service (DoS) — the filesystem cannot be frozen, and processes may hang in D state, disrupting normal system operation.
Recommendation
Apply the kernel patch provided by the Linux vendor immediately (update to a version containing the fix commit). Monitor distribution security advisories and schedule urgent system updates.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS