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CVE-2026-89818

HIGHCVSS 7.1/10

Last modified

CVE-2026-89818 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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.

Description

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.

Metrics

CVSS 3.1
7.1/10

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

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 88411caee8f576d6b5abf6531232fcc0ce756dc5, < c2340281be4ddacb8c203e2bce59b126d1d6c4c8; >= c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e, < 6dceaeceaa7c8396339f3ea34b0110cb912ca61b; >= 7688143ca62edeecacb3ba0a2cea129dbd262a18, < 47799e1f893d47d8af231710a61065e3ec8a13e8; >= 63b51e8a9d54317d31cc3856c1e12407070d5fc2, < 7e28853c78c20bb8ba4c1dba702430cd05e09f76; >= b193019860d61e92da395eae2011f2f6716b182f, < 9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3; >= b193019860d61e92da395eae2011f2f6716b182f, < 4d7390530853eb7befda9cc786e4c86e8ad7ac9e; f55552adb100eb54a6e6dabff4fbdc8679bd3fa0; 82c535eff05490c71153af57de9fe85502fcb5d5; 638d3e0b9eb77aa53fdd60e2b928761d16ba76fa; 870c8738c3774336baedddd0240951d078a703b8; 638e48ee39d0f2af9336f917a6f5d6692dd64d93; e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7; 3c817a60b09eaab926e475088e750936efcc95ae; >= 6.1.175, < 6.1.188; >= 6.6.140, < 6.6.157; >= 6.12.90, < 6.12.110; >= 6.18.32, < 6.18.51; >= 5.15.209, < 5.16; >= 7.0.9, < 7.1
LinuxLinux7.1

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-89818?
CVE-2026-89818 has a CVSS score of 7.1/10 (HIGH severity).
How do I fix CVE-2026-89818?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST