{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/dm-thin/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"id":"CVE-2026-46107"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["cve","dm-thin","refcount underflow","Microsoft"],"_cs_type":"threat","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-46107 is a reported vulnerability affecting dm-thin, related to a metadata refcount underflow. The Microsoft Security Response Center published information regarding this vulnerability on 2026-05-29. Further details regarding the specific attack vector, affected products, or exploitation specifics are unavailable from the source material. However, a metadata refcount underflow could potentially lead to data corruption, system instability, or privilege escalation if successfully exploited. Defenders should monitor for suspicious activity related to dm-thin and apply available patches when released.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003cp\u003eDue to lack of specifics, a generic attack chain is provided based on typical refcount underflow exploitation:\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains initial access to the system, possibly through other vulnerabilities or compromised credentials.\u003c/li\u003e\n\u003cli\u003eAttacker interacts with dm-thin functionality, triggering a specific code path.\u003c/li\u003e\n\u003cli\u003eThe vulnerable code path contains a flaw that results in a metadata refcount being decremented below zero.\u003c/li\u003e\n\u003cli\u003eThe refcount underflow corrupts internal metadata structures.\u003c/li\u003e\n\u003cli\u003eSubsequent operations using the corrupted metadata lead to unexpected behavior.\u003c/li\u003e\n\u003cli\u003eThis could manifest as data corruption, where data is written to incorrect locations.\u003c/li\u003e\n\u003cli\u003eAlternatively, the corrupted metadata could lead to a denial of service.\u003c/li\u003e\n\u003cli\u003eIn some scenarios, the attacker may be able to leverage the corruption for privilege escalation.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of a metadata refcount underflow vulnerability like CVE-2026-46107 could lead to data corruption, denial of service, or potentially privilege escalation on the affected system. Without specific details from the vendor, the precise scope and impact remain unclear. The number of potential victims and targeted sectors cannot be determined based on the available information.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor systems for unusual dm-thin activity, particularly related to metadata operations.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules provided to detect potential exploitation attempts (see below).\u003c/li\u003e\n\u003cli\u003eApply patches released by Microsoft to address CVE-2026-46107 when available.\u003c/li\u003e\n\u003cli\u003eInvestigate any alerts triggered by the provided Sigma rules in your environment.\u003c/li\u003e\n\u003cli\u003eEnable relevant logging for dm-thin related events to facilitate investigations.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-29T07:25:25Z","date_published":"2026-05-29T07:25:25Z","id":"https://feed.craftedsignal.io/briefs/2026-05-dm-thin-refcount-underflow/","summary":"CVE-2026-46107 is a reported vulnerability in dm-thin, leading to a metadata refcount underflow.","title":"CVE-2026-46107 dm-thin Metadata Refcount Underflow","url":"https://feed.craftedsignal.io/briefs/2026-05-dm-thin-refcount-underflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Dm-Thin","version":"https://jsonfeed.org/version/1.1"}