Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2025-21971

In the Linux kernel, the following vulnerability has been resolved: net_sched: Prevent creation of classes with TC_H_ROOT The function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination condition when traversing up the qdisc tree to update parent backlog counters. However, if a class is created with classid TC_H_ROOT, the traversal terminates prematurely at this class instead of reaching the actual root qdisc, causing parent statistics to be incorrectly maintained. In case of DRR, this could lead to a crash as reported by Mingi Cho. Prevent the creation of any Qdisc class with classid TC_H_ROOT (0xFFFFFFFF) across all qdisc types, as suggested by Jamal.

Published

2025-04-01T16:15:28.440

Last Modified

2025-11-03T20:17:33.693

Status

Modified

Source

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Severity

CVSSv3.1: 5.5 (MEDIUM)

Weaknesses
  • Type: Primary
    CWE-835
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System linux linux_kernel < 5.4.292 Yes
Operating System linux linux_kernel < 5.10.236 Yes
Operating System linux linux_kernel < 5.15.180 Yes
Operating System linux linux_kernel < 6.1.132 Yes
Operating System linux linux_kernel < 6.6.84 Yes
Operating System linux linux_kernel < 6.12.20 Yes
Operating System linux linux_kernel < 6.13.8 Yes
Operating System linux linux_kernel 2.6.25 Yes
Operating System linux linux_kernel 6.14 Yes
Operating System linux linux_kernel 6.14 Yes
Operating System linux linux_kernel 6.14 Yes
Operating System linux linux_kernel 6.14 Yes
Operating System linux linux_kernel 6.14 Yes
Operating System linux linux_kernel 6.14 Yes
References