CVE-2021-47010
published 2024-02-28CVE-2021-47010: In the Linux kernel, the following vulnerability has been resolved: net: Only allow init netns to set default tcp cong to a restricted algo…
PriorityP338high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.26%
17.4th percentile
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
17 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.10.38-1 (bookworm) | linux 5.10.38-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 6670e152447732ba90626f36dfc015a13fbf150e < 992de06308d9a9584d59b96d294ac676f924e437 | 992de06308d9a9584d59b96d294ac676f924e437 |
| linux | linux | >= 6670e152447732ba90626f36dfc015a13fbf150e < 9884f745108f7d25b189bbcd6754e284fb29ab68 | 9884f745108f7d25b189bbcd6754e284fb29ab68 |
| linux | linux | >= 6670e152447732ba90626f36dfc015a13fbf150e < 6c1ea8bee75df8fe2184a50fcd0f70bf82986f42 | 6c1ea8bee75df8fe2184a50fcd0f70bf82986f42 |
| linux | linux | >= 6670e152447732ba90626f36dfc015a13fbf150e < efe1532a6e1a8e3c343d04fff510f0ed80328f9c | efe1532a6e1a8e3c343d04fff510f0ed80328f9c |
| linux | linux | >= 6670e152447732ba90626f36dfc015a13fbf150e < e7d7bedd507bb732e600403b7a96f9fe48d0ca31 | e7d7bedd507bb732e600403b7a96f9fe48d0ca31 |
| linux | linux | >= 6670e152447732ba90626f36dfc015a13fbf150e < 8d432592f30fcc34ef5a10aac4887b4897884493 | 8d432592f30fcc34ef5a10aac4887b4897884493 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 0 < 5.10.38-1 | 5.10.38-1 |
| linux | linux_kernel | >= 4.15 < 4.19.191 | 4.19.191 |
| linux | linux_kernel | >= 4.20 < 5.4.119 | 5.4.119 |
| linux | linux_kernel | >= 5.11 < 5.11.21 | 5.11.21 |
| linux | linux_kernel | >= 5.12 < 5.12.4 | 5.12.4 |
| linux | linux_kernel | >= 5.5 < 5.10.37 | 5.10.37 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-c8v5-2jcx-x4j2: 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_
ghsa_unreviewed·2024-02-28
CVE-2021-47010 [HIGH] CWE-400 GHSA-c8v5-2jcx-x4j2: 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_
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 uncovere
OSV
CVE-2021-47010: 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_de
osv·2024-02-28·CVSS 7.8
CVE-2021-47010 [HIGH] CVE-2021-47010: 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_de
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 wi
Red Hat
kernel: net: Only allow init netns to set default tcp cong to a restricted algo
vendor_redhat·2024-02-28·CVSS 7.8
CVE-2021-47010 [HIGH] CWE-402 kernel: net: Only allow init netns to set default tcp cong to a restricted algo
kernel: 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
Debian
CVE-2021-47010: linux - In the Linux kernel, the following vulnerability has been resolved: net: Only a...
vendor_debian·2021·CVSS 7.8
CVE-2021-47010 [HIGH] CVE-2021-47010: linux - In the Linux kernel, the following vulnerability has been resolved: net: Only a...
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 wi
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9chttps://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c
2024-02-28
Published