Known Exploited Vulnerability

CVE-2021-22555

Linux Kernel Heap Out-of-Bounds Write Vulnerability

Past federal due date 121 public exploits Added 06 Oct 2025 Due 27 Oct 2025 · 279 days ago

VendorLinux

ProductKernel

WeaknessCWE-787

RansomwareNone confirmed

What the flaw is

Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space.

Description as published by CISA. We have not independently reproduced it.

What CISA requires

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.

Public exploit code

121 public repositories referencing this CVE have been catalogued on GitHub. That volume usually means a reliable, widely-reproduced exploit. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.

Showing 8 of 121. Full list in the trickest/cve dataset.

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Other Linux entries

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CVE-2022-0492

Source: CISA KEV catalog · last verified July 31, 2026. Rebuilt automatically twice a day.