What’s Vulnerable › Vulnerabilities

CVE-2023-53508: ublk: fail to start device if queue setup is interrupted

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-01 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ublk: fail to start device if queue setup is interrupted In ublk_ctrl_start_dev(), if wait_for_completion_interruptible() is interrupted by signal, queues aren't setup successfully yet, so we have to fail UBLK_CMD_START_DEV, otherwise kernel oops can be triggered. Reported by German when working on qemu-storage-deamon which requires single thread ublk daemon.

Affected products

• Linux kernel: from 6.0 before 6.1.43; from 6.2 before 6.4.8; 6.5-rc1, 6.5-rc2, 6.5-rc3 — fixed in 6.1.43, 6.4.8

How to fix

Upgrade to a fixed version: Linux kernel 6.1.43, 6.4.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0d5916c439574b18a0734872daa0022b3d6105ad
• https://git.kernel.org/stable/c/53e7d08f6d6e214c40db1f51291bb2975c789dc2
• https://git.kernel.org/stable/c/6ab3e7d424cd413d7a5e976c8a30b4ffa84a65dd

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