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CVE-2026-31522: HID: magicmouse: avoid memory leak in magicmouse_report_fixup()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: HID: magicmouse: avoid memory leak in magicmouse_report_fixup() The magicmouse_report_fixup() function was returning a newly kmemdup()-allocated buffer, but never freeing it. The caller of report_fixup() does not take ownership of the returned pointer, but it *is* permitted to return a sub-portion of the input rdesc, whose lifetime is managed by the caller.

Affected products

• Linux kernel: from 5.15.17 before 5.15.203; from 5.16.3 before 5.17; from 5.17 before 6.1.168; from 6.2 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21 — fixed in 5.15.203, 5.17, 6.1.168, 6.12.80, 6.18.21, 6.19.11

How to fix

Upgrade to a fixed version: Linux kernel 5.15.203, 5.17, 6.1.168, 6.12.80. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/136f605e246b4bfe7ac2259471d1ff814aed0084
• https://git.kernel.org/stable/c/579c4c9857acdc8380fa99803f355f878bd766cb
• https://git.kernel.org/stable/c/79e5dcc95d9abed6f8203cfd529f4ec71f0e505d
• https://git.kernel.org/stable/c/7edfe4346b052b708645d0acc0f186425766b785
• https://git.kernel.org/stable/c/91e8c6e601bdc1ccdf886479b6513c01c7e51c2c
• https://git.kernel.org/stable/c/d84c21aabaab517b9aaf9bc1d785922cb9db2f31
• https://git.kernel.org/stable/c/fa95b0146358b49f9858139b67314591fd5871b0

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