What’s Vulnerable › Vulnerabilities

CVE-2021-47466: mm, slub: fix potential memoryleak in kmem_cache_open()

• 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: 2024-05-22 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: mm, slub: fix potential memoryleak in kmem_cache_open() In error path, the random_seq of slub cache might be leaked. Fix this by using __kmem_cache_release() to release all the relevant resources.

Affected products

• Linux kernel: from 4.8 before 5.4.156; from 5.5 before 5.10.76; from 5.11 before 5.14.15; 5.15-rc1, 5.15-rc2, 5.15-rc3, 5.15-rc4, 5.15-rc5, 5.15-rc6 — fixed in 5.10.76, 5.14.15, 5.4.156

How to fix

Upgrade to a fixed version: Linux kernel 5.10.76, 5.14.15, 5.4.156. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/42b81946e3ac9ea0372ba16e05160dc11e02694f
• https://git.kernel.org/stable/c/4f5d1c29cfab5cb0ab885059818751bdef32e2bb
• https://git.kernel.org/stable/c/568f906340b43120abd6fcc67c37396482f85930
• https://git.kernel.org/stable/c/9037c57681d25e4dcc442d940d6dbe24dd31f461
• https://git.kernel.org/stable/c/42b81946e3ac9ea0372ba16e05160dc11e02694f
• https://git.kernel.org/stable/c/4f5d1c29cfab5cb0ab885059818751bdef32e2bb
• https://git.kernel.org/stable/c/568f906340b43120abd6fcc67c37396482f85930
• https://git.kernel.org/stable/c/9037c57681d25e4dcc442d940d6dbe24dd31f461

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