Riskcovery

CVE-2021-47241

ethtool: strset: fix message length calculation

State
Published
Severity
7.5 High
Published
May 21, 2024
Updated
May 11, 2026
Reserved
Apr 10, 2024

Read the record on cve.org

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 :)

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCISA-ADP

Weaknesses

  • CWE-266 Incorrect Privilege Assignment

Affected Products

ProductVersions
LinuxLinux
  • 71921690f9745fef60a2bad425f30adf8cdc9da0 to before fb3a948143688e14e2cfd2a2812877923d0e5e92Affected
  • 71921690f9745fef60a2bad425f30adf8cdc9da0 to before cfc7f0e70d649e6d2233fba0d9390b525677d971Affected
  • 71921690f9745fef60a2bad425f30adf8cdc9da0 to before e175aef902697826d344ce3a12189329848fe898Affected
LinuxLinux
  • 5.6Affected
  • before 5.6Not affected
  • 5.10.46 through 5.10.*Not affected
  • 5.12.13 through 5.12.*Not affected
  • 5.13 and laterNot affected

References

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