Privilege escalation affecting the Linux kernel
A vulnerability affecting the Linux kernel bonding driver could allow a malicious actor with local access to elevate privileges on affected systems.
Description
Technical context and vulnerability details
The Linux kernel forms the heart of the operating system for many distributions deployed in virtual, physical, and cloud environments. This kernel is affected by a vulnerability labeled CVE-2026-43456 resulting from misinterpretation of data within the network bonding manager (the bonding module). Exploitation of this vulnerability would allow an attacker with local access to access incorrect data structures in memory in order to execute arbitrary code and elevate privileges on the affected system. It is classified high with a severity score of 7.8 according to CVSS V3.1.
Potential Risks & Impact
Potential consequences upon exploitation
- Privilege escalation to system user (root);
- Complete takeover of the server hosting the system;
- Breach of confidentiality and availability of data;
- Compromise of system integrity;
Affected systems
Products, components and targeted versions
- Affected are the Linux kernel versions listed below, in which the bonding module is active and configured with non-Ethernet type interfaces:;
- All versions from 2.6.24 inclusive to 6.12.78 excluded;
- All versions from 6.13 inclusive to 6.18.19 excluded;
- All versions from 6.19 inclusive to 6.19.9 excluded;
Recommended Remediations & Actions
Immediate actions and recommended mitigations
- Update the Linux kernel to the latest stable version available;
Sources & External Links
Vendor security advisories and documentation
Advisory Specifications
CSIRT Emergency Response
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