Deadlock The advisory has been revoked - it doesn't affect any version of package kernel-headers (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-KERNELHEADERS-14965766
- published16 Jan 2026
- disclosed1 Jan 2025
Introduced: 1 Jan 2025
CVE-2025-68823 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-headers package and not the kernel-headers package as distributed by RHEL.
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:
- bdev_open() grabs disk->open_mutex
- The process issues read I/O to ublk backend to read partition table
- In __ublk_complete_rq(), blk_update_request() or blk_mq_end_request() runs bio->bi_end_io() callbacks
- 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)
- This eventually calls blkdev_release() from the same context
- blkdev_release() tries to grab disk->open_mutex again
- 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]
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2429084
- https://access.redhat.com/security/cve/CVE-2025-68823
- https://git.kernel.org/stable/c/0460e09a614291f06c008443f47393c37b7358e7
- https://git.kernel.org/stable/c/64c0b7e2293757e8320f13434cd809f1c9257a62
- https://git.kernel.org/stable/c/9bcc47343ee0ef346aa7b2b460c8ff56bd882fe7
- https://git.kernel.org/stable/c/c258f5c4502c9667bccf5d76fa731ab9c96687c1
- https://git.kernel.org/stable/c/27bb79b7717b2fbb111a1c13548b2786ee712dca