CVE-2026-89818
drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 16, 2026 |
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Affected Versions
Linux / Linux
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
Linux / Linux
7.1
References
git.kernel.org: https://git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8 git.kernel.org: https://git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b git.kernel.org: https://git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8 git.kernel.org: https://git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76 git.kernel.org: https://git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3 git.kernel.org: https://git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e