Bug 2336541 (CVE-2024-56786)

Summary:	CVE-2024-56786 kernel: bpf: put bpf_link's program when link is safe to be deallocated
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2025-01-09 12:55:43 UTC

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

bpf: put bpf_link's program when link is safe to be deallocated

The Linux kernel CVE team has assigned CVE-2024-56786 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025010808-CVE-2024-56786-1f56@gregkh/T

Comment 2 TEJ RATHI 2025-08-20 11:55:00 UTC

This CVE has been rejected by the Linux kernel community. Refer to the announcement: https://lore.kernel.org/linux-cve-announce/2025061920-REJECTED-c79f@gregkh/

The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.

For the Red Hat Enterprise Linux 9 to confirm the current state, inspect the sysctl with the command:

    cat /proc/sys/kernel/unprivileged_bpf_disabled

The setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw.

Comment added by: Automated Script

Comment 3 errata-xmlrpc 2025-11-11 10:24:31 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:20518 https://access.redhat.com/errata/RHSA-2025:20518