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CVE-2021-21781 is an information-disclosure vulnerability in the Linux kernel's ARM SIGPAGE functionality. Signal-handler information is made available through a signal page mapped into a process address space. On affected kernels, a user-space application can read SIGPAGE contents at a specific process-memory offset, disclosing residual kernel-memory data. The issue affected Linux kernel 5.4.54 and 5.4.66 and remained present in 5.11-rc4.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel ARM SIGPAGE information-disclosure vulnerability.
Linux kernel ARM SIGPAGE information-disclosure vulnerability.
Linux kernel ARM SIGPAGE information-disclosure vulnerability.
Linux kernel ARM SIGPAGE information-disclosure vulnerability.
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.