CVE-2026-90197 HID: haptic: don't write an uninitialized value to unhandled usages
An attacker with local access can read uninitialized kernel memory via HID haptic reports, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90197?
CVE-2026-90197 is a vulnerability in Linux, published on 17 Sep 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: haptic: don't write an uninitialized value to unhandled usages
fill_effect_buf() initializes value only for the four haptic usages handled by its switch, but writes it to field->value[] for every usage. An unhandled usage can therefore receive either an uninitialized value or one left over from the previous usage. hid_output_report() then serializes that value into the effect's report buffer.
Skip unhandled usages instead. This also matches switch_mode(), which only updates fields it recognizes.
Found with Clang's -Wconditional-uninitialized.
Which versions are affected by CVE-2026-90197?
How do I fix CVE-2026-90197?
Apply the vendor's patch.
Is CVE-2026-90197 being exploited?
There is no known exploitation of CVE-2026-90197 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90197, DEBIAN-CVE-2026-90197, GHSA-m8pj-r7fv-796q, UBUNTU-CVE-2026-90197.