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CVE-2026-64017 is a use-after-free vulnerability in the Linux kernel's blk-mq block I/O subsystem. During bio submission, a task can sleep after inspecting a cached request but before removing it from the cache. The resulting plug flush calls blk_mq_free_plug_rqs, freeing cached_rqs and leaving the submission path referencing a freed request. The fix removes a suitable cached request before any potentially blocking calls, retaining a queue reference to prevent serialization races with queue freezes. When a bio plug merge occurs, the removed request is freed individually. The flaw potentially permits kernel memory corruption, denial of service, or privilege escalation, depending on exploitability.
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A cached-request handling vulnerability in the Linux kernel blk-mq subsystem. The content does not specify the precise security impact.
A use-after-free vulnerability in the Linux kernel's blk-mq block I/O subsystem. A blocking operation can cause a cached request to be freed before it is removed for use. The fix removes a suitable cached request before any potentially blocking calls. The reference assigns CVSS v3 severity 7.8, with local access and low privileges required and potentially high confidentiality, integrity, and availability impacts. Affected Google COS kernel packages should be updated to version 19216.655.6 or later.
A use-after-free vulnerability in the Linux kernel's blk-mq subsystem. A blocking operation can cause cached requests to be freed before a previously inspected request is removed for use. The fix removes a suitable cached request before any potentially blocking calls. The advisory assigns CVSS v3 severity 7.8, with local access, low privileges, and potentially high confidentiality, integrity, and availability impacts. Affected Google kernel packages should be updated to version 20085.0.0 or later.
A Linux kernel blk-mq vulnerability related to handling usable cached requests, affecting Rocky Linux 9 kernel packages.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.