Improper Input Validation Affecting linux-qemu-melange package, versions <6.18.16-r0


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.4% (32nd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LINUXQEMUMELANGE-15338382
  • published24 Feb 2026
  • disclosed23 Feb 2021

Introduced: 23 Feb 2021

CVE-2021-20194  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Chainguard linux-qemu-melange to version 6.18.16-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-qemu-melange package and not the linux-qemu-melange package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.

CVSS Base Scores

version 3.1