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Review reviewHigh

CVE-2021-47517

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: ethtool: do not perform operations on net devices being unregistered There is a short period between a net device starts to be unregistered and when it is actually gone. In that time frame ethtool operations could still be performed, which might end up in unwanted or undefined behaviours[1]. Do not allow ethtool operations after a net device starts its unregistration. This patch targets the netlink part as the ioctl one isn't affected: the reference to the net device is taken and the operation is executed within an rtnl loc...

CVSS
7.8
EPSS
0.24%
15.6% percentile
CISA KEV
Not listed
Published
2024.05.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ethtool: do not perform operations on net devices being unregistered There is a short period between a net device starts to be unregistered and when it is actually gone. In that time frame ethtool operations could still be performed, which might end up in unwanted or undefined behaviours[1]. Do not allow ethtool operations after a net device starts its unregistration. This patch targets the netlink part as the ioctl one isn't affected: the reference to the net device is taken and the operation is executed within an rtnl loc...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 041b1c5d4a53e97fc9e029ae32469552ca12cb9b < 7c26da3be1e9843a15b5318f90db8a564479d2ac, >= 041b1c5d4a53e97fc9e029ae32469552ca12cb9b < cfd719f04267108f5f5bf802b9d7de69e99a99f9, >= 041b1c5d4a53e97fc9e029ae32469552ca12cb9b < dde91ccfa25fd58f64c397d91b81a4b393100ffa, >= 5.6, >= 5.6 < 5.10.87, >= 5.11 < 5.15.8, 5.16
Fixed versions
5.10.87, 5.15.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2021-47517 — Linux Linux, linux kernel | SECUFOCUS NOW