CVE-2026-20488: In display, there is a possible information disclosure due to a missing bounds check

Routine

MEDIUM 4.4MITIGATEMITIGATEMITIGATE

CVE-2026-20488 is a medium-severity flaw (CVSS 4.4) affecting mt6991 firmware, mt6993 firmware, mt8126 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In display, there is a possible information disclosure due to a missing bounds check. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11004276; Issue ID: MSV-7757.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-08-03
Last modified	2026-10-23

Publisher (CNA): MediaTek, Inc. · Vendor: mediatek

Am I affected?

Timeline

2026-08-03 03:16 UTCPublished CVE record published
2026-10-23 22:10 UTCUpdated Record last modified

mediatek mt6991 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mediatek mt6993 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mediatek mt8126 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mediatek mt8171 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mediatek mt8188 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mediatek mt8189 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-20488?

mt6991 firmware: mitigate or apply the listed mitigation; mt6993 firmware: mitigate or apply the listed mitigation; mt8126 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-20488 being exploited?

CVE-2026-20488 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-20488 affect?

CVE-2026-20488 affects mt6991 firmware, mt6993 firmware, mt8126 firmware. Severity is medium (CVSS 4.4). In display, there is a possible information disclosure due to a missing bounds check. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploit

How urgent is CVE-2026-20488?

Priority 17/100. No elevated risk signals yet.

Related CVEs

CVE-2026-20486 MEDIUM 6.7 MITIGATE MITIGATE In imgsensor, there is a possible application crash due to incorrect error handling
CVE-2026-20473 MEDIUM 6.0 MITIGATE MITIGATE In display, there is a possible memory corruption due to use after free
CVE-2026-20474 MEDIUM 6.0 MITIGATE MITIGATE In display, there is a possible escalation of privilege due to a race condition
CVE-2026-20475 MEDIUM 6.0 MITIGATE MITIGATE In display, there is a possible out of bounds write due to a missing bounds check
CVE-2026-20477 MEDIUM 6.0 MITIGATE MITIGATE In display, there is a possible out of bounds write due to a missing bounds check

References

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