High [CVE-2026-98532] do not let ipv6_find_hdr return an offset past the packet end
This high-severity Red Hat Linux advisory covers CVE-2026-98532; related products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
do not let ipv6_find_hdr() return an offset past the packet end. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-787.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; and 2 more.
Affected products named by the advisory: Red Hat OpenShift Container Platform 4; Red Hat package: kernel-rt.
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 9 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 9 days ago·verify at source
Mitigation checklist
- --- CME Mitigation Guidance (2026-10-20) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to enforce packet length bounds checks against skb->len within ipv6_find_hdr() extension header processing: upgrade to the fixed Kernel/Kernel Rt/Kernel Ivos Qualcomm/Openshift/Ose Rhel Coreos/Kpatch builds, which reject an extension header and return -EBADMSG if its declared length exceeds the remaining packet bytes (skb->len - start), closing all 2 injection vectors (crafted IPv6 network packet with oversized extension header length, Netlink packet command execution triggering Open vSwitch transport header parsing). Until patched, this is a concern on Linux systems running IPv6 networking stack, so restrict untrusted IPv6 traffic or disable unneeded IPv6 packet processing interfaces. As a compensating measure, enable kernel memory allocation error detection (KASAN/HWASan) to detect out-of-bounds slab memory accesses during IPv6 extension header parsing. These controls limit blast radius and contain exploitation, but they do not fix the underlying out-of-bounds memory read and write defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-1005 Runtime Memory Error Detection (KASAN/HWASan) (medium)
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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