Behavioral Problems Affecting kernel-core package, versions *


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

Exploit Maturity
Not Defined

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  • Snyk IDSNYK-RHEL8-KERNELCORE-8737616
  • published19 Feb 2025
  • disclosed18 Feb 2025

Introduced: 18 Feb 2025

NewCVE-2025-21702  (opens in a new tab)
CWE-438  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 kernel-core.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-core package and not the kernel-core package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

pfifo_tail_enqueue: Drop new packet when sch->limit == 0

Expected behaviour: In case we reach scheduler's limit, pfifo_tail_enqueue() will drop a packet in scheduler's queue and decrease scheduler's qlen by one. Then, pfifo_tail_enqueue() enqueue new packet and increase scheduler's qlen by one. Finally, pfifo_tail_enqueue() return NET_XMIT_CN status code.

Weird behaviour: In case we set sch->limit == 0 and trigger pfifo_tail_enqueue() on a scheduler that has no packet, the 'drop a packet' step will do nothing. This means the scheduler's qlen still has value equal 0. Then, we continue to enqueue new packet and increase scheduler's qlen by one. In summary, we can leverage pfifo_tail_enqueue() to increase qlen by one and return NET_XMIT_CN status code.

The problem is: Let's say we have two qdiscs: Qdisc_A and Qdisc_B.

  • Qdisc_A's type must have '->graft()' function to create parent/child relationship. Let's say Qdisc_A's type is hfsc. Enqueue packet to this qdisc will trigger hfsc_enqueue.
  • Qdisc_B's type is pfifo_head_drop. Enqueue packet to this qdisc will trigger pfifo_tail_enqueue.
  • Qdisc_B is configured to have sch->limit == 0.
  • Qdisc_A is configured to route the enqueued's packet to Qdisc_B.

Enqueue packet through Qdisc_A will lead to:

  • hfsc_enqueue(Qdisc_A) -> pfifo_tail_enqueue(Qdisc_B)
  • Qdisc_B->q.qlen += 1
  • pfifo_tail_enqueue() return NET_XMIT_CN
  • hfsc_enqueue() check for NET_XMIT_SUCCESS and see NET_XMIT_CN => hfsc_enqueue() don't increase qlen of Qdisc_A.

The whole process lead to a situation where Qdisc_A->q.qlen == 0 and Qdisc_B->q.qlen == 1. Replace 'hfsc' with other type (for example: 'drr') still lead to the same problem. This violate the design where parent's qlen should equal to the sum of its childrens'qlen.

Bug impact: This issue can be used for user->kernel privilege escalation when it is reachable.

CVSS Scores

version 3.1