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CVE-2025-21680 is an out-of-bounds memory-access vulnerability in the Linux kernel packet generator (pktgen) subsystem. The get_imix_entries function performed an incorrect bounds check while processing IMIX packet-size entries supplied through the pktgen control interface. Supplying enough entries allowed indexing beyond the fixed-size pkt_dev->imix_entries array; UBSAN detected an access at index 20 of a 20-element imix_pkt array. The fix corrects the boundary handling so the IMIX array can be filled without accessing beyond its allocated bounds.
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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.
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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.
4 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.