CVE-2026-43321
Received Received - Intake
BPF Indirect Jump Register Marking Vulnerability in Linux Kernel

Publication date: 2026-05-08

Last updated on: 2026-05-11

Assigner: kernel.org

Description
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.
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Meta Information
Published
2026-05-08
Last Modified
2026-05-11
Generated
2026-06-19
AI Q&A
2026-05-08
EPSS Evaluated
2026-06-18
NVD
CVE-2026-43321
EUVD
EUVD-2026-28605
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel *
linux_kernel linux_kernel *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel relates to the handling of BPF (Berkeley Packet Filter) instructions, specifically the 'gotox rX' instruction. The issue was that the rX register was not properly marked as used in the compute_insn_live_regs() function, which is responsible for tracking live registers during indirect jumps. The fix ensures that the rX register is correctly marked as live, preventing potential errors in register usage.

Impact Analysis

Improper marking of live registers in BPF instructions could lead to incorrect behavior in the kernel's execution of BPF programs. This might cause unexpected crashes, incorrect packet filtering, or other unpredictable kernel behavior, potentially affecting system stability or security.

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