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CVE-2021-4460 is an undefined-behavior flaw in the Linux kernel DRM AMD Kernel Fusion Driver (amdkfd) SDMA queue handling. When get_num_sdma_queues() or get_num_xgmi_sdma_queues() returns zero, the affected logic can perform a shift whose count equals the bit width of its operand. Such a shift is undefined in C and triggers a UBSAN shift-out-of-bounds condition. The upstream fix bounds the queue-count handling by setting the relevant SDMA queue value to ULLONG_MAX when the count is greater than or equal to the operand bit width.
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No public exploit code observed for this vulnerability.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel drm/amdkfd undefined-behavior flaw caused by an out-of-bounds bit-shift operation when SDMA or XGMI SDMA queue counts reach the operand's bit width.
A Linux kernel vulnerability involving integer overflow and information disclosure in drm/amdkfd due to an undefined shift operation.
An integer-overflow and information-disclosure vulnerability caused by an undefined shift operation in the Linux kernel drm/amdkfd component.
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.