{"id":"CVE-2026-99034","kind":"vulnerability","aliases":["CVE-2026-99034"],"related":[],"title":"Linux kernel: SD host driver leaves runtime PM enabled on removal","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: sdhci-sprd: disable runtime PM on remove\n\nsdhci_sprd_probe() enables runtime PM, while sdhci_sprd_remove() does\nnot perform the corresponding runtime PM cleanup.\n\nThe probe failure path disables runtime PM before disabling the clocks,\nbut the normal remove path directly disables clocks that are also\nmanaged by the runtime PM callbacks. If the device is runtime\nsuspended, those clocks may already be disabled.\n\nResume the device before removal, disable runtime PM and drop the\ntemporary runtime PM reference before disabling the clocks.\n\nThis issue was found by manual code inspection.","summary":"The sdhci-sprd MMC driver in the Linux kernel does not undo its runtime power management setup when removed, so clocks can be disabled twice if the device is suspended. The sources describe a kernel fault found by code inspection, with no stated way for an attacker to trigger it.","severity":"unknown","cvss":null,"epss":0.00209,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["embedded","infrastructure","linux-kernel","unisoc-hardware"],"not_affected_if":["no-driver-unbind","no-unisoc-hardware"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-23T13:17:26+00:00","first_seen_at":"2026-10-23T21:57:33+00:00","triaged_at":"2026-10-25T04:54:21+00:00","updated_at":"2026-10-25T12:38:50+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-10-25T04:54:21Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"local","title":"Linux kernel: SD host driver leaves runtime PM enabled on removal","impact":"low","summary":"The sdhci-sprd MMC driver in the Linux kernel does not undo its runtime power management setup when removed, so clocks can be disabled twice if the device is suspended. The sources describe a kernel fault found by code inspection, with no stated way for an attacker to trigger it.","category":"infrastructure","nicknames":[],"who_cares":["linux-kernel","unisoc-hardware","embedded"],"confidence":0.5,"needs_auth":"unknown","worst_case":"unknown; likely a kernel clock or power fault during driver removal","analyst_note":"Check the kernel.org stable commit for the affected and fixed kernel versions and whether any exploit path exists beyond driver unbind.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["no-unisoc-hardware","no-driver-unbind"],"who_is_affected":"Systems running a Linux kernel with the Unisoc sdhci-sprd SD/MMC host controller driver, mainly devices that unbind or remove this controller at runtime. Systems without this Unisoc hardware, or that never unbind the controller, are unlikely to be affected. The sources do not name specific kernel versions.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000594,"input_tokens":3452,"output_tokens":497,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-99034':14A,17A 'alreadi':150C 'also':134C 'attack':73B 'callback':140C 'cleanup':112C 'clock':47B,123C,131C,148C,171C 'code':65B,178C 'correspond':109C 'cve':12A,15A 'describ':59B 'devic':54B,143C,155C 'direct':129C 'disabl':50B,90C,117C,121C,130C,152C,158C,169C 'driver':5A,31B 'drop':162C 'embed':18B 'enabl':9A,98C 'failur':115C 'fault':62B 'follow':81C 'found':63B,175C 'hardwar':25B 'host':4A 'infrastructur':19B 'inspect':66B,179C 'issu':173C 'kernel':2A,22B,35B,61B,79C 'leav':6A 'linux':1A,21B,34B,78C 'linux-kernel':20B 'manag':42B,135C 'manual':177C 'may':149C 'mmc':30B,86C 'normal':126C 'path':116C,128C 'perform':107C 'pm':8A,92C,100C,111C,119C,139C,160C,166C 'power':41B 'probe':97C,114C 'refer':167C 'remov':11A,45B,94C,104C,127C,157C 'resolv':85C 'resum':153C 'runtim':7A,40B,91C,99C,110C,118C,138C,145C,159C,165C 'sd':3A 'sdhci':28B,88C,95C,102C 'sdhci-sprd':27B,87C 'setup':43B 'sourc':58B 'sprd':29B,89C,96C,103C 'state':69B 'suspend':56B,146C 'temporari':164C 'trigger':75B 'twice':51B 'undo':38B 'unisoc':24B 'unisoc-hardwar':23B 'vulner':82C 'way':70B","nicknames":[],"mitigations":[],"who_affected":"Systems running a Linux kernel with the Unisoc sdhci-sprd SD/MMC host controller driver, mainly devices that unbind or remove this controller at runtime. Systems without this Unisoc hardware, or that never unbind the controller, are unlikely to be affected. The sources do not name specific kernel versions.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-23T13:17:26+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-99034","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99034","severity":null,"published_at":"2026-10-23T13:17:26+00:00","modified_at":"2026-10-23T13:17:26+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-2026-99034","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-99034","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"}