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CVE-2021-47497 is an undefined-behavior vulnerability in the Linux kernel NVMEM subsystem. When reading an NVMEM cell whose nbits value is an exact multiple of BITS_PER_BYTE, the cell-read masking logic computes a zero modulo result and decrements it before constructing a bitmask. This can produce a shift exponent exceeding the width of unsigned long; UBSAN observed a shift exponent of 64 on a 64-bit system. The fix applies masking only when residual bits remain to be masked.
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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.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel NVMEM shift-out-of-bounds flaw.
Linux kernel NVMEM flaw involving an out-of-bounds shift with byte-sized cells.
A CVE included in the advisory's CVE list; no vulnerability details are provided in the content.
A vulnerability addressed by this OpenShift Container Platform 4.18.5 security update; no technical details are provided in the content.
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.