{"id":"CVE-2026-98566","kind":"vulnerability","aliases":["CVE-2026-98566"],"related":[],"title":"Linux kernel: PowerVR DRM freelist reconstruction lacks bounds check","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/imagination: clamp freelist reconstruction requests\n\nThe firmware reconstruction count controls accesses to the request's\nfixed freelist ID array and the copy into the fixed response array.\nNeither access currently bounds the count to those protocol arrays.\n\nClamp the count to the request capacity, which is shared by the response\nlayout, and use that count consistently for reconstruction and response\npublication. Keep the firmware recovery exchange instead of dropping an\noversized request without a response, as discussed with the firmware\nmaintainer.\n\nThe issue was found by our static-analysis tool.","summary":"The Linux kernel's Imagination PowerVR GPU driver (drm/imagination) used a firmware-supplied count to index fixed-size freelist arrays without bounding it. The fix clamps that count to the request capacity; the sources do not say what an attacker gets beyond an out-of-bounds access.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["drm","imagination-gpu","infrastructure","linux-kernel","powervr"],"not_affected_if":["no-powervr-gpu"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-18T16:17:08+00:00","first_seen_at":"2026-10-23T21:57:15+00:00","triaged_at":"2026-10-25T05:23:16+00:00","updated_at":"2026-10-25T05:23:16+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-10-25T05:23:16Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"unknown","title":"Linux kernel: PowerVR DRM freelist reconstruction lacks bounds check","impact":"medium","summary":"The Linux kernel's Imagination PowerVR GPU driver (drm/imagination) used a firmware-supplied count to index fixed-size freelist arrays without bounding it. The fix clamps that count to the request capacity; the sources do not say what an attacker gets beyond an out-of-bounds access.","category":"infrastructure","nicknames":[],"who_cares":["linux-kernel","drm","powervr","imagination-gpu"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown","analyst_note":"Check the NVD entry and the upstream kernel commit for affected kernel versions, the fixed stable release, and whether the out-of-bounds access is reachable from the GPU firmware or from user space.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["no-powervr-gpu"],"who_is_affected":"unknown","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000545,"input_tokens":3423,"output_tokens":406,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':11A,14A '-98566':12A,15A 'access':74B,95C,113C 'analysi':174C 'array':46B,103C,111C,121C 'attack':66B 'beyond':68B 'bound':8A,48B,73B,115C 'capac':58B,128C 'check':9A 'clamp':52B,86C,122C 'consist':140C 'control':94C 'copi':106C 'count':39B,54B,93C,117C,124C,139C 'current':114C 'cve':10A,13A 'discuss':161C 'driver':32B 'drm':4A,16B 'drm/imagination':33B,85C 'drop':153C 'exchang':150C 'firmwar':37B,91C,148C,164C 'firmware-suppli':36B 'fix':43B,51B,100C,109C 'fixed-s':42B 'follow':80C 'found':169C 'freelist':5A,45B,87C,101C 'get':67B 'gpu':19B,31B 'id':102C 'imagin':18B,29B 'imagination-gpu':17B 'index':41B 'infrastructur':20B 'instead':151C 'issu':167C 'keep':146C 'kernel':2A,23B,27B,78C 'lack':7A 'layout':135C 'linux':1A,22B,26B,77C 'linux-kernel':21B 'maintain':165C 'neither':112C 'out-of-bound':70B 'overs':155C 'powervr':3A,24B,30B 'protocol':120C 'public':145C 'reconstruct':6A,88C,92C,142C 'recoveri':149C 'request':57B,89C,98C,127C,156C 'resolv':84C 'respons':110C,134C,144C,159C 'say':63B 'share':131C 'size':44B 'sourc':60B 'static':173C 'static-analysi':172C 'suppli':38B 'tool':175C 'use':34B,137C 'vulner':81C 'without':47B,157C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-18T16:17:08+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-98566","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98566","severity":null,"published_at":"2026-10-18T16:17:08+00:00","modified_at":"2026-10-19T10:19:14+00:00","first_seen_at":"2026-10-23T21:57:15+00:00","fetched_at":"2026-10-23T22:28:56+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}