CVE-2024-26878 Affecting kernel-rt-modules package, versions <0:4.18.0-553.16.1.rt7.357.el8_10


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-ROCKY8-KERNELRTMODULES-7780576
  • published22 Aug 2024
  • disclosed17 Apr 2024

Introduced: 17 Apr 2024

CVE-2024-26878  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 kernel-rt-modules to version 0:4.18.0-553.16.1.rt7.357.el8_10 or higher.
This issue was patched in RLSA-2024:5102.

NVD Description

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

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

quota: Fix potential NULL pointer dereference

Below race may cause NULL pointer dereference

P1 P2 dquot_free_inode quota_off drop_dquot_ref remove_dquot_ref dquots = i_dquot(inode) dquots = i_dquot(inode) srcu_read_lock dquots[cnt]) != NULL (1) dquots[type] = NULL (2) spin_lock(&dquots[cnt]->dq_dqb_lock) (3) ....

If dquot_free_inode(or other routines) checks inode's quota pointers (1) before quota_off sets it to NULL(2) and use it (3) after that, NULL pointer dereference will be triggered.

So let's fix it by using a temporary pointer to avoid this issue.

CVSS Scores

version 3.1