What’s Vulnerable › Vulnerabilities

CVE-2022-50140: memstick/ms_block: Fix a memory leak

• 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: 2025-06-18 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: memstick/ms_block: Fix a memory leak 'erased_blocks_bitmap' is never freed. As it is allocated at the same time as 'used_blocks_bitmap', it is likely that it should be freed also at the same time. Add the corresponding bitmap_free() in msb_data_clear().

Affected products

• Linux kernel: from 3.12 before 4.14.291; from 4.15 before 4.19.256; from 4.20 before 5.4.211; from 5.5 before 5.10.137; from 5.11 before 5.15.61; from 5.16 before 5.18.18 — fixed in 4.14.291, 4.19.256, 5.10.137, 5.15.61, 5.18.18, 5.19.2

How to fix

Upgrade to a fixed version: Linux kernel 4.14.291, 4.19.256, 5.10.137, 5.15.61. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/16e07966638717416abf45393d6a80a5a1034429
• https://git.kernel.org/stable/c/37958980eb4cd71ae594ace093c11b6a91e165e8
• https://git.kernel.org/stable/c/39be95d1ff7b44c1e969af72ba9da7332dfcc1da
• https://git.kernel.org/stable/c/54eb7a55be6779c4d0c25eaf5056498a28595049
• https://git.kernel.org/stable/c/9260a154b3b5e387dbceec7c0ac441470646bc6f
• https://git.kernel.org/stable/c/961d7d12080fe70847f944d656e36cd0dd0214ba
• https://git.kernel.org/stable/c/9d8b911fe3c3ed788c66edba7c90e32a4a7a5f53
• https://git.kernel.org/stable/c/efd675246aec045507b9425c67b548cc2d782d8f

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