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CVE-2025-21976 is a Linux kernel flaw in the Hyper-V framebuffer driver (hyperv_fb). During device unbind, the driver forcibly released the framebuffer even when it remained in use. The framebuffer framework rejected that release, emitted a warning, and the framebuffer and associated memory were not subsequently released. The fix transfers framebuffer and associated-memory cleanup to the fb_ops.fb_destroy callback, allowing the framebuffer framework to defer destruction until it is safe, and replaces manual framebuffer registration and unregistration with device-managed registration.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
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.