CVE-2026-89818

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux88411caee8f576d6b5abf6531232fcc0ce756dc5 < c2340281be4ddacb8c203e2bce59b126d1d6c4c8affected
LinuxLinuxc72a8b4dc6d598e3831ef3abd9c6527dfbf4810e < 6dceaeceaa7c8396339f3ea34b0110cb912ca61baffected
LinuxLinux7688143ca62edeecacb3ba0a2cea129dbd262a18 < 47799e1f893d47d8af231710a61065e3ec8a13e8affected
LinuxLinux63b51e8a9d54317d31cc3856c1e12407070d5fc2 < 7e28853c78c20bb8ba4c1dba702430cd05e09f76affected
LinuxLinuxb193019860d61e92da395eae2011f2f6716b182f < 9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3affected
LinuxLinuxb193019860d61e92da395eae2011f2f6716b182f < 4d7390530853eb7befda9cc786e4c86e8ad7ac9eaffected
LinuxLinuxf55552adb100eb54a6e6dabff4fbdc8679bd3fa0affected
LinuxLinux82c535eff05490c71153af57de9fe85502fcb5d5affected
LinuxLinux638d3e0b9eb77aa53fdd60e2b928761d16ba76faaffected
LinuxLinux870c8738c3774336baedddd0240951d078a703b8affected
LinuxLinux638e48ee39d0f2af9336f917a6f5d6692dd64d93affected
LinuxLinuxe382e0b81a3e7bd21504fee1d01ae8b08f84d3a7affected
LinuxLinux3c817a60b09eaab926e475088e750936efcc95aeaffected
LinuxLinux6.1.175 < 6.1.188affected
LinuxLinux6.6.140 < 6.6.157affected
LinuxLinux6.12.90 < 6.12.110affected
LinuxLinux6.18.32 < 6.18.51affected
LinuxLinux5.15.209 < 5.16affected
LinuxLinux7.0.9 < 7.1affected
LinuxLinux7.1affected
LinuxLinux0 < 7.1unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References