CVE-2021-47010
- Source
- https://nvd.nist.gov/vuln/detail/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
- Related
- Published
- 2024-02-28T09:15:38Z
- Modified
- 2024-11-21T06:35:10Z
- 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
-
- https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42
- https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493
- https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68
- https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437
- https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31
- https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c
- https://security-tracker.debian.org/tracker/CVE-2021-47010
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source