Bug 2460655 (CVE-2026-31522)

Summary: CVE-2026-31522 kernel: HID: magicmouse: avoid memory leak in magicmouse_report_fixup()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's HID magicmouse driver. The `magicmouse_report_fixup()` function, responsible for fixing report descriptors, allocates a new memory buffer but fails to free it. This memory leak can accumulate over time, potentially allowing a local attacker to exhaust system resources and cause a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-04-22 15:03:26 UTC 
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.
Comment 1 Keith Grant 2026-04-22 20:18:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042212-CVE-2026-31522-b576@gregkh/T