Medium [CVE-2026-64000] fix potential OOB access in supervision frame handling
This medium-severity Red Hat Linux advisory covers CVE-2026-64000 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel.
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Summary
In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix potential OOB access in supervision frame handling Ensure the entire TLV header is linearized before access by adding sizeof(struct hsr_sup_tlv) to the pskb_may_pull() calls. Without this, a truncated frame could cause an out-of-bounds access.
A flaw was found in the Linux kernel's High-availability Seamless Redundancy (HSR) module. The issue arises because the system does not ensure the entire TLV (Type-Length-Value) header is properly processed before memory access.
This could lead to system instability or denial of service. An out of bounds read can occur in the HSR supervision frame parser because the code may access the next TLV header before the full struct hsr_sup_tlv is present and linearized in the skb.
A truncated or malformed HSR supervision frame from an adjacent Layer 2 network can reach this path and may cause a kernel crash or other availability impact. For the CVSS the PR:N because an attacker only needs adjacent network reachability to an exposed HSR interface and no local account on the target.
The issue is not Internet routable in normal deployments because HSR is an Ethernet redundancy protocol used mainly in local industrial or availability focused networks. Impact is at least denial of service.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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