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CVE-2021-26341 is a transient-execution vulnerability affecting a subset of AMD Zen1 and Zen2 processors. When branch-target prediction information is unavailable or evicted, direct unconditional JMP and CALL instructions can be mispredicted, allowing transient execution of fall-through instructions that architecturally should be unreachable. This Straight-Line Speculation behavior can create cache side effects that disclose data processed by speculative gadgets. The limited speculative window can be extended in practical gadgets through Store-to-Load Forwarding. AMD Zen3 processors tested in the documented research did not exhibit this behavior.
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No public exploit code observed for this vulnerability.
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11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A speculative-execution vulnerability affecting AMD Zen1/Zen2 where the branch predictor can mispredict direct unconditional control-flow transfers (e.g., JMP/CALL), enabling straight-line speculative execution of fall-through “dead” code past the branch. This can be induced reliably (e.g., by evicting/flush-ing BTB entries) and used to create short SLS gadgets that leak information via microarchitectural side channels (cache), including demonstrations breaking Linux KASLR via eBPF-injected gadgets.
Transient-execution vulnerability affecting AMD CPUs.
CPU transient-execution issue affecting AMD processors.
AMD CPU speculative-execution issue that can execute transiently beyond an unconditional direct branch.
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.