CVE-2026-31520 HID: apple: avoid memory leak in apple_report_fixup()
A memory leak in the Linux kernel's Apple HID driver allows attackers to cause a denial of service by exhausting system memory.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31520?
CVE-2026-31520 is a medium-severity memory corruption vulnerability in Linux kernel, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
HID: apple: avoid memory leak in apple_report_fixup()
The apple_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.
Weakness: CWE-401
Which versions are affected by CVE-2026-31520?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31520?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-31520 being exploited?
There is no known exploitation of CVE-2026-31520 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-83285, BELL-CVE-2026-31520, DEBIAN-CVE-2026-31520, GHSA-j7qm-9792-fvr5, ROOT-OS-DEBIAN-12-CVE-2026-31520, ROOT-OS-UBUNTU-2204-CVE-2026-31520 and 2 more.