{"id":"CVE-2026-89818","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check\n\nIf the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression\n6 + num_buffers * 4 wraps to 2 an…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check\n\nIf the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression\n6 + num_buffers * 4 wraps to 2 an…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 88411caee8f576d6b5abf6531232fcc0ce756dc5 < c2340281be4ddacb8c203e2bce59b126d1d6c4c8","Linux >= c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e < 6dceaeceaa7c8396339f3ea34b0110cb912ca61b","Linux >= 7688143ca62edeecacb3ba0a2cea129dbd262a18 < 47799e1f893d47d8af231710a61065e3ec8a13e8","Linux >= 63b51e8a9d54317d31cc3856c1e12407070d5fc2 < 7e28853c78c20bb8ba4c1dba702430cd05e09f76","Linux >= b193019860d61e92da395eae2011f2f6716b182f < 9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3","Linux >= b193019860d61e92da395eae2011f2f6716b182f < 4d7390530853eb7befda9cc786e4c86e8ad7ac9e","Linux f55552adb100eb54a6e6dabff4fbdc8679bd3fa0","Linux 82c535eff05490c71153af57de9fe85502fcb5d5","Linux 638d3e0b9eb77aa53fdd60e2b928761d16ba76fa","Linux 870c8738c3774336baedddd0240951d078a703b8","Linux 638e48ee39d0f2af9336f917a6f5d6692dd64d93","Linux e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7","Linux 3c817a60b09eaab926e475088e750936efcc95ae","Linux >= 6.1.175 < 6.1.188","Linux >= 6.6.140 < 6.6.157","Linux >= 6.12.90 < 6.12.110","Linux >= 6.18.32 < 6.18.51","Linux >= 5.15.209 < 5.16","Linux >= 7.0.9 < 7.1","Linux 7.1"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:11.030","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89818","references":[{"url":"https://git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:54.003Z","epss":0.00159,"epssPercentile":0.05527,"slug":"CVE-2026-89818","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check\n\nIf the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression\n6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting\nthe parser loop far past the end of the message BO. Triggering it\nadditionally requires a ~4GiB mapping so that msg[1] survives the\nearlier \"header does not fit in BO\" check.\n\nRewrite the test in division form, which is overflow-free by\nconstruction. Also update the message to reflect that msg is invalid.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205228,"id":"CVE-2026-89818","ts":1789570705827,"field":"cvss","old":null,"new":"7.1"},{"seq":205227,"id":"CVE-2026-89818","ts":1789570705827,"field":"severity","old":"none","new":"high"}]}