CVE-2025-68823
MediumCVSS 5.5Summary
W jądrze systemu Linux zidentyfikowano podatność, która prowadziła do zakleszczenia podczas odczytu tabeli partycji z urządzenia blokowego ublk. Problem występował, gdy proces próbował uzyskać dostęp do urządzenia blokowego, co prowadziło do sytuacji, w której ten sam proces czekał na mutex, który już posiadał.
Risk Assessment
Zakleszczenie może prowadzić do zablokowania procesów, co wpływa na dostępność systemu i może prowadzić do przerw w działaniu usług. Organizacje mogą doświadczyć problemów z wydajnością i stabilnością systemów korzystających z ublk.
Recommendation
Zaleca się aktualizację jądra systemu Linux do wersji, w której wprowadzono poprawkę eliminującą tę podatność. Należy również monitorować systemy pod kątem wystąpienia zakleszczeń i wdrożyć odpowiednie procedury zaradcze.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ublk: fix deadlock when reading partition table When one process(such as udev) opens ublk block device (e.g., to read the partition table via bdev_open()), a deadlock[1] can occur: 1. bdev_open() grabs disk->open_mutex 2. The process issues read I/O to ublk backend to read partition table 3. In __ublk_complete_rq(), blk_update_request() or blk_mq_end_request() runs bio->bi_end_io() callbacks 4. If this triggers fput() on file descriptor of ublk block device, the work may be deferred to current task's task work (see fput() implementation) 5. This eventually calls blkdev_release() from the same context 6. blkdev_release() tries to grab disk->open_mutex again 7. Deadlock: same task waiting for a mutex it already holds The fix is to run blk_update_request() and blk_mq_end_request() with bottom halves disabled. This forces blkdev_release() to run in kernel work-queue context instead of current task work context, and allows ublk server to make forward progress, and avoids the deadlock. [axboe: rewrite comment in ublk]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

