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CVE-2025-37980: block: fix resource leak in blk_register_queue() error path

• Severity: medium (CVSS 5.5 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: 2025-05-20 · updated 2026-10-15
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: block: fix resource leak in blk_register_queue() error path When registering a queue fails after blk_mq_sysfs_register() is successful but the function later encounters an error, we need to clean up the blk_mq_sysfs resources. Add the missing blk_mq_sysfs_unregister() call in the error path to properly clean up these resources and prevent a memory leak.

Affected products

• Linux kernel: from 3.13 before 6.6.88; from 6.7 before 6.12.25; from 6.13 before 6.14.4; 6.15-rc1, 6.15-rc2 — fixed in 6.12.25, 6.14.4, 6.6.88

How to fix

Upgrade to a fixed version: Linux kernel 6.12.25, 6.14.4, 6.6.88. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/40f2eb9b531475dd01b683fdaf61ca3cfd03a51e
• https://git.kernel.org/stable/c/41e43134ddda35949974be40520460a12dda3502
• https://git.kernel.org/stable/c/549cbbd14bbec12469ceb279b79c763c8a24224e
• https://git.kernel.org/stable/c/55a7bb2708f7c7c5b366d4e40916113168a3824c
• https://git.kernel.org/stable/c/6af6d5feebf9423ab3b252831d1f52de31a8b5e0
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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