{"id":"CVE-2026-98894","kind":"vulnerability","aliases":["CVE-2026-98894"],"related":[],"title":"Linux amdgpu RAS: corrupt CPER entry can hang the record-writing worker","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/ras: reset CPER ring on corrupt entry size\n\nWhen CPER ring overflow handling advances the read pointer, it trusts the\nparsed entry size from the current ring contents. Corrupt CPER data can\nproduce an entry size that does not advance rptr after dword conversion\nand pointer masking.\n\nIn that case the recovery loop keeps testing the same location while\nholding the CPER ring mutex. This can hang the worker that is writing the\nnext CPER record.\n\nDetect a no-progress rptr update and reset the CPER ring to an empty\nstate instead. This drops the corrupt contents and lets the writer leave\nthe recovery path without spinning.","summary":"A corrupt CPER record can produce an entry size that stops the ring read pointer from advancing, so the recovery loop spins while holding the CPER ring mutex. The fix resets the ring to empty when no progress is made, which drops the corrupt data and lets the writer continue.","severity":"unknown","cvss":null,"epss":0.00198,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["amd-gpu","infrastructure","kernel","linux"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-23T12:18:23+00:00","first_seen_at":"2026-10-23T21:57:33+00:00","triaged_at":"2026-10-25T04:59:57+00:00","updated_at":"2026-10-25T12:38:50+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-10-25T04:59:57Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Linux amdgpu RAS: corrupt CPER entry can hang the record-writing worker","impact":"low","summary":"A corrupt CPER record can produce an entry size that stops the ring read pointer from advancing, so the recovery loop spins while holding the CPER ring mutex. The fix resets the ring to empty when no progress is made, which drops the corrupt data and lets the writer continue.","category":"infrastructure","nicknames":[],"who_cares":["linux","amd-gpu","kernel"],"confidence":0.5,"needs_auth":"unknown","worst_case":"Kernel worker hangs while holding a mutex, causing a denial of service","analyst_note":"","how_to_check":"unknown","needs_analyst":false,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.00051,"input_tokens":3455,"output_tokens":328,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-98894':16A,19A 'advanc':42B,99C,125C 'amd':21B 'amd-gpu':20B 'amdgpu':2A 'case':135C 'content':113C,183C 'continu':75B 'convers':129C 'corrupt':4A,27B,69B,91C,114C,182C 'cper':5A,28B,51B,88C,95C,115C,147C,160C,172C 'current':111C 'cve':14A,17A 'data':70B,116C 'detect':162C 'drm/amd/ras':86C 'drop':67B,180C 'dword':128C 'empti':60B,176C 'entri':6A,33B,92C,107C,120C 'fix':55B 'follow':81C 'gpu':22B 'handl':98C 'hang':8A,152C 'hold':49B,145C 'infrastructur':23B 'instead':178C 'keep':139C 'kernel':24B,79C 'leav':188C 'let':72B,185C 'linux':1A,25B,78C 'locat':143C 'loop':46B,138C 'made':65B 'mask':132C 'mutex':53B,149C 'next':159C 'no-progress':164C 'overflow':97C 'pars':106C 'path':191C 'pointer':40B,102C,131C 'produc':31B,118C 'progress':63B,166C 'ras':3A 'read':39B,101C 'record':11A,29B,161C 'record-writ':10A 'recoveri':45B,137C,190C 'reset':56B,87C,170C 'resolv':85C 'ring':38B,52B,58B,89C,96C,112C,148C,173C 'rptr':126C,167C 'size':34B,93C,108C,121C 'spin':47B,193C 'state':177C 'stop':36B 'test':140C 'trust':104C 'updat':168C 'vulner':82C 'without':192C 'worker':13A,154C 'write':12A,157C 'writer':74B,187C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-23T12:18:23+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-98894","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98894","severity":null,"published_at":"2026-10-23T12:18:23+00:00","modified_at":"2026-10-23T12:18:23+00:00","first_seen_at":"2026-10-23T21:57:33+00:00","fetched_at":"2026-10-23T22:29:03+00:00","note":null},{"source":"epss","external_id":"CVE-2026-98894","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98894","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-25T12:38:50+00:00","fetched_at":"2026-10-25T12:38:50+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"}