CVE-2021-47241

ethtool: strset: fix message length calculation

Description

In the Linux kernel, the following vulnerability has been resolved: ethtool: strset: fix message length calculation Outer nest for ETHTOOL_A_STRSET_STRINGSETS is not accounted for. This may result in ETHTOOL_MSG_STRSET_GET producing a warning like: calculated message payload length (684) not sufficient WARNING: CPU: 0 PID: 30967 at net/ethtool/netlink.c:369 ethnl_default_doit+0x87a/0xa20 and a splat. As usually with such warnings three conditions must be met for the warning to trigger: - there must be no skb size rounding up (e.g. reply_size of 684); - string set must be per-device (so that the header gets populated); - the device name must be at least 12 characters long. all in all with current user space it looks like reading priv flags is the only place this could potentially happen. Or with syzbot :)

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.19%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/fb3a948143688e14e2cfd2a2812877923d0e5e92 patch
https://git.kernel.org/stable/c/cfc7f0e70d649e6d2233fba0d9390b525677d971 patch
https://git.kernel.org/stable/c/e175aef902697826d344ce3a12189329848fe898 patch

Frequently Asked Questions

What is the severity of CVE-2021-47241?
CVE-2021-47241 has been scored as a high severity vulnerability.
How to fix CVE-2021-47241?
To fix CVE-2021-47241, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47241 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47241 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47241?
CVE-2021-47241 affects Linux Linux, Linux Linux.
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