drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89818
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:16:47 UTC
Updated2026-09-16 15:18:11 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 88411caee8f576d6b5abf6531232fcc0ce756dc5 c2340281be4ddacb8c203e2bce59b126d1d6c4c8 git Not specified
CNA Linux Linux affected c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e 6dceaeceaa7c8396339f3ea34b0110cb912ca61b git Not specified
CNA Linux Linux affected 7688143ca62edeecacb3ba0a2cea129dbd262a18 47799e1f893d47d8af231710a61065e3ec8a13e8 git Not specified
CNA Linux Linux affected 63b51e8a9d54317d31cc3856c1e12407070d5fc2 7e28853c78c20bb8ba4c1dba702430cd05e09f76 git Not specified
CNA Linux Linux affected b193019860d61e92da395eae2011f2f6716b182f 9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3 git Not specified
CNA Linux Linux affected b193019860d61e92da395eae2011f2f6716b182f 4d7390530853eb7befda9cc786e4c86e8ad7ac9e git Not specified
CNA Linux Linux affected f55552adb100eb54a6e6dabff4fbdc8679bd3fa0 git Not specified
CNA Linux Linux affected 82c535eff05490c71153af57de9fe85502fcb5d5 git Not specified
CNA Linux Linux affected 638d3e0b9eb77aa53fdd60e2b928761d16ba76fa git Not specified
CNA Linux Linux affected 870c8738c3774336baedddd0240951d078a703b8 git Not specified
CNA Linux Linux affected 638e48ee39d0f2af9336f917a6f5d6692dd64d93 git Not specified
CNA Linux Linux affected e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7 git Not specified
CNA Linux Linux affected 3c817a60b09eaab926e475088e750936efcc95ae git Not specified
CNA Linux Linux affected 6.1.175 6.1.188 semver Not specified
CNA Linux Linux affected 6.6.140 6.6.157 semver Not specified
CNA Linux Linux affected 6.12.90 6.12.110 semver Not specified
CNA Linux Linux affected 6.18.32 6.18.51 semver Not specified
CNA Linux Linux affected 5.15.209 5.16 semver Not specified
CNA Linux Linux affected 7.0.9 7.1 semver Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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