Bug 2468047 (CVE-2026-43321)

Summary: CVE-2026-43321 kernel: bpf: Properly mark live registers for indirect jumps
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. This vulnerability arises from the kernel's failure to correctly identify and mark active registers during indirect jump operations within the BPF program execution. An attacker could potentially exploit this to manipulate the kernel's state, leading to unexpected system behavior or a bypass of security controls, which may result in information disclosure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-08 14:01:49 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Properly mark live registers for indirect jumps

For a `gotox rX` instruction the rX register should be marked as used
in the compute_insn_live_regs() function. Fix this.
Comment 1 Keith Grant 2026-05-08 19:18:20 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050819-CVE-2026-43321-6554@gregkh/T