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Review reviewHigh

CVE-2025-71066

Linux

In the Linux kernel, the following vulnerability has been resolved: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change zdi-disclosures@trendmicro.com says: The vulnerability is a race condition between `ets_qdisc_dequeue` and `ets_qdisc_change`. It leads to UAF on `struct Qdisc` object. Attacker requires the capability to create new user and network namespace in order to trigger the bug. See my additional commentary at the end of the analysis. Analysis: static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt, struct netlink_ext_ack *extack) {...

CVSS
7.8
EPSS
0.15%
4.54% percentile
CISA KEV
Not listed
Published
2026.01.14
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change zdi-disclosures@trendmicro.com says: The vulnerability is a race condition between `ets_qdisc_dequeue` and `ets_qdisc_change`. It leads to UAF on `struct Qdisc` object. Attacker requires the capability to create new user and network namespace in order to trigger the bug. See my additional commentary at the end of the analysis. Analysis: static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt, struct netlink_ext_ack *extack) {...

Affected product and versions

Product
Linux
Affected versions
>= ae2659d2c670252759ee9c823c4e039c0e05a6f2 < 062d5d544e564473450d72e6af83077c2b2ff7c3, >= e25bdbc7e951ae5728fee1f4c09485df113d013c < c7f6e7cc14df72b997258216e99d897d2df0dbbd, >= de6d25924c2a8c2988c6a385990cafbe742061bf < a75d617a4ef08682f5cfaadc01d5141c87e019c9, >= de6d25924c2a8c2988c6a385990cafbe742061bf < 9987cda315c08f63a02423fa2f9a1f6602c861a0, >= de6d25924c2a8c2988c6a385990cafbe742061bf < 06bfb66a7c8b45e3fed01351a4b087410ae5ef39, >= de6d25924c2a8c2988c6a385990cafbe742061bf < 45466141da3c98a0c5fa88be0bc14b4b6a4bd75c, >= de6d25924c2a8c2988c6a385990cafbe742061bf < ce052b9402e461a9aded599f5b47e76bc727f7de, >= 5.10.83 < 5.10.248, >= 5.15.6 < 5.15.198, >= 5.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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-362