7.8

CVE-2021-47010

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

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

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

tcp_set_default_congestion_control() is netns-safe in that it writes
to &net->ipv4.tcp_congestion_control, but it also sets
ca->flags |= TCP_CONG_NON_RESTRICTED which is not namespaced.
This has the unintended side-effect of changing the global
net.ipv4.tcp_allowed_congestion_control sysctl, despite the fact that it
is read-only: 97684f0970f6 ("net: Make tcp_allowed_congestion_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 tcp_allowed_congestion_control were namespace-ified in the
future.

This bug was uncovered with
https://github.com/JonathonReinhart/linux-netns-sysctl-verify
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.191
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.119
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.37
Linux ≫ Linux Kernel Version >= 5.11 < 5.11.21
Linux ≫ Linux Kernel Version >= 5.12 < 5.12.4
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.26% 0.168
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-400 Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource.

https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42
Patch
https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493
Patch
https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68
Patch
https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437
Patch
https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31
Patch
https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c
Patch