Information Exposure Affecting kernel-debug-core package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.05% (17th percentile)

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  • Snyk ID SNYK-RHEL8-KERNELDEBUGCORE-8287132
  • published 23 Oct 2024
  • disclosed 21 Oct 2024

How to fix?

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

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug-core package and not the kernel-debug-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:

icmp: change the order of rate limits

ICMP messages are ratelimited :

After the blamed commits, the two rate limiters are applied in this order:

  1. host wide ratelimit (icmp_global_allow())

  2. Per destination ratelimit (inetpeer based)

In order to avoid side-channels attacks, we need to apply the per destination check first.

This patch makes the following change :

  1. icmp_global_allow() checks if the host wide limit is reached. But credits are not yet consumed. This is deferred to 3)

  2. The per destination limit is checked/updated. This might add a new node in inetpeer tree.

  3. icmp_global_consume() consumes tokens if prior operations succeeded.

This means that host wide ratelimit is still effective in keeping inetpeer tree small even under DDOS.

As a bonus, I removed icmp_global.lock as the fast path can use a lock-free operation.

CVSS Scores

version 3.1
Expand this section

NVD

5.5 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    None
  • Availability (A)
    None
Expand this section

Red Hat

5.5 medium