# CVE-2025-68823: ublk: fix deadlock when reading partition table CVE-2025-68823 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-68823, released January 13, 2026. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2025-68823 - Priority: Urgent - CVSS: 9.8 (Critical) - EPSS: 0.0013 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 13, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68823 ## Description 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] ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | kernel-uek ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-core ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-core ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-core ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-core ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-devel ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-devel ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-core ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-core ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-deprecated ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-deprecated ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-desktop ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-desktop ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-extra ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-extra ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-extra-netfilter ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-extra-netfilter ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-usb ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-usb ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-wireless ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-debug-modules-wireless ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-devel ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-devel ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-doc ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-doc ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-core ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-core ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-deprecated ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-deprecated ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-desktop ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-desktop ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-extra ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-extra ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-extra-netfilter ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-extra-netfilter ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-usb ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-usb ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-wireless ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-modules-wireless ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-tools ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek-tools ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-core ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-core ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-devel ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-devel ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-core ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-core ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-deprecated ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-deprecated ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-desktop ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-desktop ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-extra ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-extra ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-extra-netfilter ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-extra-netfilter ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-usb ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-usb ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-wireless ol 10 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | kernel-uek64k-modules-wireless ol 9 | 0:6.12.0-200.74.27.el9uek | [ELSA-2026-50160](https://patchblox.com/security/data/fix/linux/elsa-2026-50160.md) | Mar 20, 2026 | | Linux | linux Debian 12.15 (bookworm) | 6.1.176-1 | [DEBIAN-CVE-2025-68823](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68823.md) | Jan 13, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.73-1 | [DEBIAN-CVE-2025-68823](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68823.md) | Jan 13, 2026 | | Linux | linux Debian 14 | 6.18.3-1 | [DEBIAN-CVE-2025-68823](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68823.md) | Jan 13, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.