Description (CNA)
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
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 6670e152447732ba90626f36dfc015a13fbf150e before 992de06308d9a9584d59b96d294ac676f924e437; affected 6670e152447732ba90626f36dfc015a13fbf150e before 9884f745108f7d25b189bbcd6754e284fb29ab68; affected 6670e152447732ba90626f36dfc015a13fbf150e before 6c1ea8bee75df8fe2184a50fcd0f70bf82986f42; affected 6670e152447732ba90626f36dfc015a13fbf150e before efe1532a6e1a8e3c343d04fff510f0ed80328f9c; affected 6670e152447732ba90626f36dfc015a13fbf150e before e7d7bedd507bb732e600403b7a96f9fe48d0ca31; affected 6670e152447732ba90626f36dfc015a13fbf150e before 8d432592f30fcc34ef5a10aac4887b4897884493 |
| Linux / Linux | affected 4.15; unaffected 0 before 4.15; unaffected 4.19.191 through 4.19.*; unaffected 5.4.119 through 5.4.*; unaffected 5.10.37 through 5.10.*; unaffected 5.11.21 through 5.11.*; unaffected 5.12.4 through 5.12.*; unaffected 5.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437
- https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68
- https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42
- https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c
- https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31
- https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493
ADP enrichment
No English description supplied.
- https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437
- https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68
- https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42
- https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c
- https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31
- https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493
No English description supplied.
No references supplied.