{"id":"CVE-2026-98177","aliases":[],"cve":{"records":[{"id":"CVE-2026-98177","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.322Z","published":"2026-10-06T08:44:20.807Z","modified":"2026-11-10T18:15:11.582Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-11-10T18:15:11.582Z"}],"references":[{"url":"https://git.kernel.org/stable/c/85f2d80a260f2ee90647da094b80a2d5ce719750","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/3c97f7cb6c48826663648b6081b614c2befc8ac7","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/287a34c4d712e0bdb67751e21316d9c8d75a528a","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/8ee521b8b189799e361d4233c5180ba56656d4d4","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.12.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.18.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"drm/amdkfd: Avoid integer underflow in EOP ring size calculation.","titleSource":"Linux","descriptionSource":"Linux","description":"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 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)","score":null,"severity":"unknown","published":"2026-10-06T08:44:20.807Z","modified":"2026-11-10T18:15:11.582Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"d696d536f0a97ac779d6176107ac4e96d0a2f8b9","status":"affected","lessThan":"85f2d80a260f2ee90647da094b80a2d5ce719750","versionType":"git"},{"version":"d696d536f0a97ac779d6176107ac4e96d0a2f8b9","status":"affected","lessThan":"3c97f7cb6c48826663648b6081b614c2befc8ac7","versionType":"git"},{"version":"d696d536f0a97ac779d6176107ac4e96d0a2f8b9","status":"affected","lessThan":"287a34c4d712e0bdb67751e21316d9c8d75a528a","versionType":"git"},{"version":"d696d536f0a97ac779d6176107ac4e96d0a2f8b9","status":"affected","lessThan":"8ee521b8b189799e361d4233c5180ba56656d4d4","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98177"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"4.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.3","versionType":"semver"},{"version":"6.12.117","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.61","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98177"}],"remediation":[],"references":["https://git.kernel.org/stable/c/85f2d80a260f2ee90647da094b80a2d5ce719750","https://git.kernel.org/stable/c/3c97f7cb6c48826663648b6081b614c2befc8ac7","https://git.kernel.org/stable/c/287a34c4d712e0bdb67751e21316d9c8d75a528a","https://git.kernel.org/stable/c/8ee521b8b189799e361d4233c5180ba56656d4d4"],"sources":[{"name":"CVE","id":"CVE-2026-98177","modified":"2026-11-10T18:15:11.582Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-98177"}],"assessments":[],"sourceAffected":[],"observedAt":"2026-11-10T18:24:57.104Z","kev":{"status":"not-listed","checkedAt":"2026-11-14T23:40:32.333Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-07T02:40:39.216Z","attemptedAt":"2026-11-07T02:40:39.216Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-07T02:40:39.650Z","attemptedAt":"2026-11-07T02:40:39.650Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-07T02:40:39.914Z","attemptedAt":"2026-11-07T02:40:39.914Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-07T02:40:38.918Z","attemptedAt":"2026-11-07T02:40:38.918Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-98177","url":"https://www.first.org/epss/","probability":0.00155,"percentile":0.04704,"date":"2026-11-06","checkedAt":"2026-11-07T02:40:38.918Z"},{"source":"NVD","id":"CVE-2026-98177","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98177","modified":"2026-11-06T18:18:28.973","checkedAt":"2026-11-07T02:40:39.216Z"},{"source":"GitHub Advisory Database","id":"GHSA-w77g-jh5m-m588","url":"https://github.com/advisories/GHSA-w77g-jh5m-m588","modified":"2026-11-06T18:35:58Z","checkedAt":"2026-11-07T02:40:39.650Z"},{"source":"ENISA EUVD","id":"EUVD-2026-93105","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-93105","modified":"Nov 6, 2026, 5:14:59 PM","checkedAt":"2026-11-07T02:40:39.914Z"}],"aiSummary":{"text":"The Linux kernel's drm/amdkfd component has an integer underflow vulnerability in EOP ring size calculation, affecting versions prior to 6.12.117, 6.18.61, 7.2.8, and 7.3. The issue occurs when calculating the base-2 logarithm of the EOP ring size.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-10T18:41:15.011Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-98177"}]}}