Use After Free Affecting kernel-rt-core package, versions *


Severity

Recommended
low

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTCORE-7102080
  • published24 May 2024
  • disclosed21 May 2024

Introduced: 21 May 2024

CVE-2021-47259  (opens in a new tab)
CWE-416  (opens in a new tab)
First added by Snyk

How to fix?

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

NVD Description

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

NFS: Fix use-after-free in nfs4_init_client()

KASAN reports a use-after-free when attempting to mount two different exports through two different NICs that belong to the same server.

Olga was able to hit this with kernels starting somewhere between 5.7 and 5.10, but I traced the patch that introduced the clear_bit() call to 4.13. So something must have changed in the refcounting of the clp pointer to make this call to nfs_put_client() the very last one.

CVSS Scores

version 3.1