Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-89818: drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 47799e1f893d47d8af231710a61065e3ec8a13e8, 4d7390530853eb7befda9cc786e4c86e8ad7ac9e, 5.16; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 47799e1f893d47d8af231710a61065e3ec8a13e8, 4d7390530853eb7befda9cc786e4c86e8ad7ac9e, 5.16; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check If the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression 6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting the parser loop far past the end of the message BO. Triggering it additionally requires a ~4GiB mapping so that msg[1] survives the earlier "header does not fit in BO" check. Rewrite the test in division form, which is overflow-free by construction. Also update the message to reflect that msg is invalid.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Sep 16, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-89818

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • f55552adb100eb54a6e6dabff4fbdc8679bd3fa0, 82c535eff05490c71153af57de9fe85502fcb5d5, 638d3e0b9eb77aa53fdd60e2b928761d16ba76fa, 870c8738c3774336baedddd0240951d078a703b8, 638e48ee39d0f2af9336f917a6f5d6692dd64d93, e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7, 3c817a60b09eaab926e475088e750936efcc95ae, 7.1affected
    • 88411caee8f576d6b5abf6531232fcc0ce756dc5 and later · before c2340281be4ddacb8c203e2bce59b126d1d6c4c8affected · git
    • c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e and later · before 6dceaeceaa7c8396339f3ea34b0110cb912ca61baffected · git
    • 7688143ca62edeecacb3ba0a2cea129dbd262a18 and later · before 47799e1f893d47d8af231710a61065e3ec8a13e8affected · git
    • 63b51e8a9d54317d31cc3856c1e12407070d5fc2 and later · before 7e28853c78c20bb8ba4c1dba702430cd05e09f76affected · git
    • b193019860d61e92da395eae2011f2f6716b182f and later · before 9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3affected · git
    • b193019860d61e92da395eae2011f2f6716b182f and later · before 4d7390530853eb7befda9cc786e4c86e8ad7ac9eaffected · git
    • 6.1.175 and later · before 6.1.188affected · semver
    • 6.6.140 and later · before 6.6.157affected · semver
    • 6.12.90 and later · before 6.12.110affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-89816Sep 16, 2026 · drm: Fix drm_crtc_commit leak if signaled when PAGE_FLIP_EVENT is used
    0Monitor
  • ← EarlierCVE-2026-89817Sep 16, 2026 · drm/gud: NUL-terminate TV mode names read from the device
    0Monitor
  • Later →CVE-2026-89819Sep 16, 2026 · drm/amd/display: validate plane degamma LUT size for private color prop
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux47799e1f893d47d8af231710a61065e3ec8a13e8Vendor (CNA)
Linux Linux4d7390530853eb7befda9cc786e4c86e8ad7ac9eVendor (CNA)
Linux Linux5.16Vendor (CNA)
Linux Linux6.1.188Vendor (CNA)
Linux Linux6.12.110Vendor (CNA)
Linux Linux6.18.51Vendor (CNA)
Linux Linux6.6.157Vendor (CNA)
Linux Linux6dceaeceaa7c8396339f3ea34b0110cb912ca61bVendor (CNA)
Linux Linux7.1Vendor (CNA)
Linux Linux7e28853c78c20bb8ba4c1dba702430cd05e09f76Vendor (CNA)
Linux Linux9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3Vendor (CNA)
Linux Linuxc2340281be4ddacb8c203e2bce59b126d1d6c4c8Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records