{"id":"CVE-2026-98177","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow in EOP ring size calculation.\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 in EOP ring size calculation.\n\nThe low 6 bits of cp_hqd_eop_control store the base-2 logarithm\nof the EOP ring size. This was calcul…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= d696d536f0a97ac779d6176107ac4e96d0a2f8b9 < 287a34c4d712e0bdb67751e21316d9c8d75a528a","Linux >= d696d536f0a97ac779d6176107ac4e96d0a2f8b9 < 8ee521b8b189799e361d4233c5180ba56656d4d4","Linux 4.3"],"published":"2026-10-06","updated":"2026-10-07","sourceUpdated":"2026-10-07T07:17:04.270","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98177","references":[{"url":"https://git.kernel.org/stable/c/287a34c4d712e0bdb67751e21316d9c8d75a528a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8ee521b8b189799e361d4233c5180ba56656d4d4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98177.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98177"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2546416"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98177"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98177"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98177.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00155,"epssPercentile":0.04616,"ingestedAt":"2026-10-06T08:50:17.456Z","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-191"],"slug":"CVE-2026-98177","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow in EOP ring size calculation.\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\norder_base_2(q->eop_ring_buffer_size / 4) - 1\n\nBut order_base_2 can in theory return 0, so this could underflow\n(although in practice the ring buffer size cannot be less than 4096).\n\nChange this to\n\norder_base_2(q->eop_ring_buffer_size / 8)\n\nusing properties of logarithms.\n\nAlso add to the above comment to make the mathematics more clear.\n\n(cherry picked from commit f0f43fcf8b2b3a924cad9444340921c96ed5f634)\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98177.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224141,"id":"CVE-2026-98177","ts":1792324956973,"field":"cvss","old":null,"new":"5.5"},{"seq":224140,"id":"CVE-2026-98177","ts":1792324956973,"field":"severity","old":"none","new":"medium"}]}