Bug 2464384 (CVE-2026-43030)

Summary:	CVE-2026-43030 kernel: bpf: Fix regsafe() for pointers to packet
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. A logic error in the `regsafe()` function, specifically when handling pointers to packets, could lead to an incorrect state where valid packet ranges are not properly explored. This vulnerability may allow an attacker to bypass certain security checks or cause unexpected system behavior.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-01 15:03:42 UTC

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

bpf: Fix regsafe() for pointers to packet

In case rold->reg->range == BEYOND_PKT_END && rcur->reg->range == N
regsafe() may return true which may lead to current state with
valid packet range not being explored. Fix the bug.

Comment 1 Keith Grant 2026-05-01 17:27:19 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050100-CVE-2026-43030-58b8@gregkh/T