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Use After Free Affecting kernel-debug package, versions <0:4.18.0-193.119.1.el8_2

Severity

 Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.04% (6th percentile)

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  • Snyk ID SNYK-RHEL8-KERNELDEBUG-6076109
  • published 22 Nov 2023
  • disclosed 6 Jul 2023
Report a new vulnerability Found a mistake?

Introduced: 6 Jul 2023

CVE-2023-3776 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade RHEL:8 kernel-debug to version 0:4.18.0-193.119.1.el8_2 or higher.
This issue was patched in RHSA-2023:7434.

NVD Description

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

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.

We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.

CVSS Scores

version 3.1
Expand this section

NVD

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

Red Hat

7 high
Expand this section

SUSE

7 high