CVE-2021-47293
published 2024-05-21CVE-2021-47293: In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: Skip non-Ethernet packets Currently tcf_skbmod_act() assumes that…
PriorityP339high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.23%
14.5th percentile
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_skbmod: Skip non-Ethernet packets
Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2
protocol, which is not always the case. As an example, for CAN devices:
$ ip link add dev vcan0 type vcan
$ ip link set up vcan0
$ tc qdisc add dev vcan0 root handle 1: htb
$ tc filter add dev vcan0 parent 1: protocol ip prio 10 \
matchall action skbmod swap mac
Doing the above silently corrupts all the packets. Do not perform skbmod
actions for non-Ethernet packets.
Affected
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.14.6-1 (bookworm) | linux 5.14.6-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 86da71b57383d40993cb90baafb3735cffe5d800 < e4fdca366806f6bab374d1a95e626a10a3854b0c | e4fdca366806f6bab374d1a95e626a10a3854b0c |
| linux | linux | >= 86da71b57383d40993cb90baafb3735cffe5d800 < a88414fb1117f2fe65fb88e45ba694e1d09d5024 | a88414fb1117f2fe65fb88e45ba694e1d09d5024 |
| linux | linux | >= 86da71b57383d40993cb90baafb3735cffe5d800 < 071729150be9e1d1b851b70efb6d91ee9269d57b | 071729150be9e1d1b851b70efb6d91ee9269d57b |
| linux | linux | >= 86da71b57383d40993cb90baafb3735cffe5d800 < 34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d | 34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d |
| linux | linux | >= 86da71b57383d40993cb90baafb3735cffe5d800 < 727d6a8b7ef3d25080fad228b2c4a1d4da5999c6 | 727d6a8b7ef3d25080fad228b2c4a1d4da5999c6 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.70-1 | 5.10.70-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 4.20 < 5.4.136 | 5.4.136 |
| linux | linux_kernel | >= 4.9 < 4.19.199 | 4.19.199 |
| linux | linux_kernel | >= 5.11 < 5.13.6 | 5.13.6 |
| linux | linux_kernel | >= 5.5 < 5.10.54 | 5.10.54 |
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
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GHSA
GHSA-qqw5-j897-27cf: In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_skbmod: Skip non-Ethernet packets
Currently tcf_skbmod_act() assu
ghsa_unreviewed·2024-05-21
CVE-2021-47293 [HIGH] GHSA-qqw5-j897-27cf: In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_skbmod: Skip non-Ethernet packets
Currently tcf_skbmod_act() assu
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_skbmod: Skip non-Ethernet packets
Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2
protocol, which is not always the case. As an example, for CAN devices:
$ ip link add dev vcan0 type vcan
$ ip link set up vcan0
$ tc qdisc add dev vcan0 root handle 1: htb
$ tc filter add dev vcan0 parent 1: protocol ip prio 10 \
matchall action skbmod swap mac
Doing the above silently corrupts all the packets. Do not perform skbmod
actions for non-Ethernet packets.
OSV
CVE-2021-47293: In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: Skip non-Ethernet packets Currently tcf_skbmod_act() assume
osv·2024-05-21·CVSS 7.8
CVE-2021-47293 [HIGH] CVE-2021-47293: In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: Skip non-Ethernet packets Currently tcf_skbmod_act() assume
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: Skip non-Ethernet packets Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2 protocol, which is not always the case. As an example, for CAN devices: $ ip link add dev vcan0 type vcan $ ip link set up vcan0 $ tc qdisc add dev vcan0 root handle 1: htb $ tc filter add dev vcan0 parent 1: protocol ip prio 10 \ matchall action skbmod swap mac Doing the above silently corrupts all the packets. Do not perform skbmod actions for non-Ethernet packets.
Red Hat
kernel: net/sched: act_skbmod: Skip non-Ethernet packets
vendor_redhat·2024-05-21·CVSS 7.8
CVE-2021-47293 [HIGH] CWE-20 kernel: net/sched: act_skbmod: Skip non-Ethernet packets
kernel: net/sched: act_skbmod: Skip non-Ethernet packets
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_skbmod: Skip non-Ethernet packets
Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2
protocol, which is not always the case. As an example, for CAN devices:
$ ip link add dev vcan0 type vcan
$ ip link set up vcan0
$ tc qdisc add dev vcan0 root handle 1: htb
$ tc filter add dev vcan0 parent 1: protocol ip prio 10 \
matchall action skbmod swap mac
Doing the above silently corrupts all the packets. Do not perform skbmod
actions for non-Ethernet packets.
A vulnerability was found in the Linux kernel’s act_skbmod module, where the tcf_skbmod_act() function mistakenly assumes all packets use Ethernet as their protocol. This issue can
Debian
CVE-2021-47293: linux - In the Linux kernel, the following vulnerability has been resolved: net/sched: ...
vendor_debian·2021·CVSS 7.8
CVE-2021-47293 [HIGH] CVE-2021-47293: linux - In the Linux kernel, the following vulnerability has been resolved: net/sched: ...
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: Skip non-Ethernet packets Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2 protocol, which is not always the case. As an example, for CAN devices: $ ip link add dev vcan0 type vcan $ ip link set up vcan0 $ tc qdisc add dev vcan0 root handle 1: htb $ tc filter add dev vcan0 parent 1: protocol ip prio 10 \ matchall action skbmod swap mac Doing the above silently corrupts all the packets. Do not perform skbmod actions for non-Ethernet packets.
Scope: local
bookworm: resolved (fixed in 5.14.6-1)
bullseye: resolved (fixed in 5.10.70-1)
forky: resolved (fixed in 5.14.6-1)
sid: resolved (fixed in 5.14.6-1)
trixie: resolved (fixed in 5.14.6-1)
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57bhttps://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0dhttps://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0chttps://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57bhttps://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0dhttps://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c
2024-05-21
Published