In the Linux kernel, the following vulnerability has been resolved: iio: adc: mt6359: fix unchecked return value in mt6358_read_imp In… (CVE-2026-63936)
A vulnerability in the Linux kernel's iio adc mt6359 driver involved an unchecked return value in the mt6358_read_imp() function. If the regmap_read() call failed, an uninitialized variable could lead to random stack data being reported as measurement results. This could potentially leak stack data. The issue has been resolved by initializing the variable to zero to prevent uninitialized use and data leakage.
AI Analysis
Technical Summary
The vulnerability CVE-2026-63936 in the Linux kernel affects the iio adc mt6359 driver where the function mt6358_read_imp() did not check the return value of regmap_read(). If regmap_read() failed, the variable val_v remained uninitialized, causing random stack content to be reported as measurement data. The fix initializes val_v to zero, ensuring predictable output and preventing potential leakage of stack data. This also addresses static analysis warnings about uninitialized variable use.
Potential Impact
If exploited, this vulnerability could cause the system to report random stack data as sensor measurement results, potentially leaking sensitive information from kernel stack memory. There is no indication of direct code execution or privilege escalation from this issue. No known exploits are reported in the wild.
Mitigation Recommendations
A fix has been implemented that initializes the variable val_v to zero in the affected function, preventing uninitialized use and data leakage. Users should apply the official Linux kernel updates that include this fix. Since this is a kernel-level vulnerability, updating to a patched kernel version is the recommended remediation. Patch status is not explicitly stated here; check the Linux kernel vendor advisory for the specific fixed versions and update accordingly.
In the Linux kernel, the following vulnerability has been resolved: iio: adc: mt6359: fix unchecked return value in mt6358_read_imp In… (CVE-2026-63936)
Description
A vulnerability in the Linux kernel's iio adc mt6359 driver involved an unchecked return value in the mt6358_read_imp() function. If the regmap_read() call failed, an uninitialized variable could lead to random stack data being reported as measurement results. This could potentially leak stack data. The issue has been resolved by initializing the variable to zero to prevent uninitialized use and data leakage.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-63936 in the Linux kernel affects the iio adc mt6359 driver where the function mt6358_read_imp() did not check the return value of regmap_read(). If regmap_read() failed, the variable val_v remained uninitialized, causing random stack content to be reported as measurement data. The fix initializes val_v to zero, ensuring predictable output and preventing potential leakage of stack data. This also addresses static analysis warnings about uninitialized variable use.
Potential Impact
If exploited, this vulnerability could cause the system to report random stack data as sensor measurement results, potentially leaking sensitive information from kernel stack memory. There is no indication of direct code execution or privilege escalation from this issue. No known exploits are reported in the wild.
Mitigation Recommendations
A fix has been implemented that initializes the variable val_v to zero in the affected function, preventing uninitialized use and data leakage. Users should apply the official Linux kernel updates that include this fix. Since this is a kernel-level vulnerability, updating to a patched kernel version is the recommended remediation. Patch status is not explicitly stated here; check the Linux kernel vendor advisory for the specific fixed versions and update accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-856p-gwqh-fxcq
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63936"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27aa2a4a8d598912ebdb
Added to database: 07/19/2026, 19:38:18 UTC
Last enriched: 07/19/2026, 20:05:51 UTC
Last updated: 07/20/2026, 17:26:47 UTC
Views: 12
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.