High

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

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.

Published Sep 16, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Linux

CVSS base

7.1

High · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	version 638e48ee39d0f2af9336f917a6f5d6692dd64d93version 7.1≥ 7.0.9 and < 7.1≥ 5.15.209 and < 5.16≥ 6.18.32 and < 6.18.51≥ 6.12.90 and < 6.12.110≥ 6.6.140 and < 6.6.157≥ 6.1.175 and < 6.1.188 and 12 more version 3c817a60b09eaab926e475088e750936efcc95aeversion e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7≥ 88411caee8f576d6b5abf6531232fcc0ce756dc5 and < c2340281be4ddacb8c203e2bce59b126d1d6c4c8version 870c8738c3774336baedddd0240951d078a703b8version 638d3e0b9eb77aa53fdd60e2b928761d16ba76faversion 82c535eff05490c71153af57de9fe85502fcb5d5version f55552adb100eb54a6e6dabff4fbdc8679bd3fa0≥ b193019860d61e92da395eae2011f2f6716b182f and < 4d7390530853eb7befda9cc786e4c86e8ad7ac9e≥ b193019860d61e92da395eae2011f2f6716b182f and < 9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3≥ 63b51e8a9d54317d31cc3856c1e12407070d5fc2 and < 7e28853c78c20bb8ba4c1dba702430cd05e09f76≥ 7688143ca62edeecacb3ba0a2cea129dbd262a18 and < 47799e1f893d47d8af231710a61065e3ec8a13e8≥ c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e and < 6dceaeceaa7c8396339f3ea34b0110cb912ca61b	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.1	CVSS 3.1	High	1.8	5.2	416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database
7.1	CVSS 3.1	High	—	—	Linux via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67)

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 7.1
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 16, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

6 on the record

git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3
NIST National Vulnerability Database
git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8
NIST National Vulnerability Database
git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b
NIST National Vulnerability Database
git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e
NIST National Vulnerability Database
git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8
NIST National Vulnerability Database
git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 12h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 12h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89818 is "drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.1 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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