Loop with Unreachable Exit Condition ('Infinite Loop') Affecting kernel-doc package, versions *


Severity

Recommended
low

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.2% (10th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-RHEL6-KERNELDOC-18597139
  • published8 Aug 2026
  • disclosed19 Jul 2026

Introduced: 19 Jul 2026

NewCVE-2026-63982  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:6 kernel-doc.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-doc package and not the kernel-doc package as distributed by RHEL. See How to fix? for RHEL:6 relevant fixed versions and status.

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

net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop

When mirred redirects to ingress (from either ingress or egress) the loop state from sched_mirred_dev array dev is lost because of 1) the packet deferral into the backlog and 2) the fact the sched_mirred_dev array is cleared. In such cases, if there was a loop we won't discover it.

Here's a simple test to reproduce: ip a add dev port0 10.10.10.11/24

tc qdisc add dev port0 clsact tc filter add dev port0 egress protocol ip
prio 10 matchall action mirred ingress redirect dev port1

tc qdisc add dev port1 clsact tc filter add dev port1 ingress protocol ip
prio 10 matchall action mirred egress redirect dev port0

ping -c 1 -W0.01 10.10.10.10

CVSS Base Scores

version 3.1