{"id":"CVE-2026-98176","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc\n\nThe low 6 bits of cp_hqd_eop_control store the base-2 logarithm\nof the EOP ring size","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc\n\nThe low 6 bits of cp_hqd_eop_control store the base-2 logarithm\nof the EOP ring size. This was calcu…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 14328aa58ce523a59996c5a82681c43ec048cc33 < 82e1b8299c6da02ce02185c208d2fdf7572b5ea1","Linux >= 14328aa58ce523a59996c5a82681c43ec048cc33 < c883d0a132d430ef7ebb23fd94323be94d0fbdb8","Linux 5.3"],"published":"2026-10-06","updated":"2026-10-07","sourceUpdated":"2026-10-07T07:17:04.167","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98176","references":[{"url":"https://git.kernel.org/stable/c/82e1b8299c6da02ce02185c208d2fdf7572b5ea1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c883d0a132d430ef7ebb23fd94323be94d0fbdb8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00155,"epssPercentile":0.04615,"ingestedAt":"2026-10-06T08:50:17.453Z","slug":"CVE-2026-98176","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc\n\nThe low 6 bits of cp_hqd_eop_control store the base-2 logarithm\nof the EOP ring size. This was calculated as\n\nffs(q->eop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1\n\nBut ffs can in theory return 1 or 0, so this could underflow\n(although in practice the ring buffer size cannot be less than 4096).\n\nChange this to\n\nffs(q->eop_ring_buffer_size / sizeof(unsigned int) / 4)\n\nusing properties of logarithms.\n\n(cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}