Race Condition Affecting bpftool package, versions <0:4.18.0-477.74.1.el8_8


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-RHEL8-BPFTOOL-8084753
  • published24 Sept 2024
  • disclosed1 May 2024

Introduced: 1 May 2024

CVE-2024-27020  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade RHEL:8 bpftool to version 0:4.18.0-477.74.1.el8_8 or higher.
This issue was patched in RHSA-2024:6993.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bpftool package and not the bpftool 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:

netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

nft_unregister_expr() can concurrent with __nft_expr_type_get(), and there is not any protection when iterate over nf_tables_expressions list in __nft_expr_type_get(). Therefore, there is potential data-race of nf_tables_expressions list entry.

Use list_for_each_entry_rcu() to iterate over nf_tables_expressions list in __nft_expr_type_get(), and use rcu_read_lock() in the caller nft_expr_type_get() to protect the entire type query process.

CVSS Scores

version 3.1