Live › vulnerability › CVE-2021-22555
Go to dashboardA heap out-of-bounds write in the Linux kernel's netfilter code can corrupt kernel memory when a local user creates a user namespace. An attacker with a local account can gain root privileges or crash the machine, and CISA lists it as actively exploited.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| netapp c400 firmware | vendor | – | – |
| netapp c250 firmware | vendor | – | – |
| netapp h410c firmware | vendor | – | – |
| netapp h300s firmware | vendor | – | – |
| netapp h500s firmware | vendor | – | – |
| netapp h700s firmware | vendor |
| – |
| – |
| netapp h410s firmware | vendor | – | – |
| linux kernel | vendor | >= 2.6.19, < 4.4.267 | 4.4.267 |
| linux kernel | vendor | >= 4.5, < 4.9.267 | 4.9.267 |
| linux kernel | vendor | >= 4.10, < 4.14.231 | 4.14.231 |
| linux kernel | vendor | >= 4.15, < 4.19.188 | 4.19.188 |
| linux kernel | vendor | >= 4.20, < 5.4.113 | 5.4.113 |
| linux kernel | vendor | >= 5.5, < 5.10.31 | 5.10.31 |
| linux kernel | vendor | >= 5.11, < 5.12 | 5.12 |
| broadcom fabric operating system | vendor | – | – |
| netapp fas 8300 firmware | vendor | – | – |
| netapp fas 8700 firmware | vendor | – | – |
| netapp aff a400 firmware | vendor | – | – |
| netapp aff a250 firmware | vendor | – | – |
| netapp aff 500f firmware | vendor | – | – |
| netapp h610c firmware | vendor | – | – |
| netapp h610s firmware | vendor | – | – |
| netapp h615c firmware | vendor | – | – |
| netapp cloud backup | vendor | – | – |
| netapp hci management node | vendor | – | – |
| netapp solidfire | vendor | – | – |
| netapp solidfire baseboard management controller | vendor | – | – |
| Linux Kernel | vendor | – | – |
uname -r Check your distro's kernel advisory for CVE-2021-22555 against your installed kernel build
s BOD 22-01 guidance or the vendors mitigation instructionsEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
CISA required action: 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 page as .md · .json · in your agent: get_signal("CVE-2021-22555")
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