CVE-2021-47010

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2021-47010
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47010.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-47010
Downstream
Published
2024-02-28T09:15:38.657Z
Modified
2026-03-13T05:20:29.430023Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

net: Only allow init netns to set default tcp cong to a restricted algo

tcpsetdefaultcongestioncontrol() is netns-safe in that it writes to &net->ipv4.tcpcongestioncontrol, but it also sets ca->flags |= TCPCONGNONRESTRICTED which is not namespaced. This has the unintended side-effect of changing the global net.ipv4.tcpallowedcongestioncontrol sysctl, despite the fact that it is read-only: 97684f0970f6 ("net: Make tcpallowedcongestion_control readonly in non-init netns")

Resolve this netns "leak" by only allowing the init netns to set the default algorithm to one that is restricted. This restriction could be removed if tcpallowedcongestion_control were namespace-ified in the future.

This bug was uncovered with https://github.com/JonathonReinhart/linux-netns-sysctl-verify

References

Affected packages

Git /

Affected ranges

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47010.json"
unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "4.15"
            },
            {
                "fixed": "4.19.191"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.20"
            },
            {
                "fixed": "5.4.119"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.5"
            },
            {
                "fixed": "5.10.37"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.11"
            },
            {
                "fixed": "5.11.21"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.12"
            },
            {
                "fixed": "5.12.4"
            }
        ]
    }
]