Vulnerability in Linux

CVE-2026-89818

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 · last modified .

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (5.1th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-89818: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000

Affected products

  • Linux — versions 3c817a60b09eaab926e475088e750936efcc95ae, 638d3e0b9eb77aa53fdd60e2b928761d16ba76fa, 638e48ee39d0f2af9336f917a6f5d6692dd64d93

References

Frequently asked questions

What is CVE-2026-89818?
CVE-2026-89818 is a high-severity vulnerability in Linux. CVSS score: 7.1/10. Published 2026-09-16.
How severe is CVE-2026-89818?
High severity. CVSS v3 base score is 7.1 out of 10.