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CVE-2025-68218: nvme-multipath: fix lockdep WARN due to partition scan work

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-16 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: nvme-multipath: fix lockdep WARN due to partition scan work Blktests test cases nvme/014, 057 and 058 fail occasionally due to a lockdep WARN. As reported in the Closes tag URL, the WARN indicates that a deadlock can happen due to the dependency among disk->open_mutex, kblockd workqueue completion and partition_scan_work completion. To avoid the lockdep WARN and the potential deadlock, cut the dependency by running the partition_scan_work not by kblockd workqueue but by nvme_wq.

Affected products

• Linux kernel: from 6.1.118 before 6.1.159; from 6.6.62 before 6.6.118; from 6.11.9 before 6.12; 6.12 — fixed in 6.1.159, 6.12, 6.18, 6.6.118

How to fix

Upgrade to a fixed version: Linux kernel 6.1.159, 6.12, 6.18, 6.6.118. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6d87cd5335784351280f82c47cc8a657271929c3
• https://git.kernel.org/stable/c/89456dab7ba5ab63d60945440926673a3205e829
• https://git.kernel.org/stable/c/b03eb63288a8ffe3adfb34e68309c8e2edb06d0b
• https://git.kernel.org/stable/c/e2a897ad5f538d314955c747a0a2edb184fcdecd
• https://git.kernel.org/stable/c/ef4ab2a8abe554379e10303ae86f7c501336ba0d

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