In the Linux kernel, the following vulnerability has been resolved:
libbpf: Reject non-exclusive metadata maps in the signed loader
The loader verifies map->sha against the metadata hash in its instructions. map->sha is calculated when BPF_OBJ_GET_INFO_BY_FD is called on the frozen map.
While the map is frozen, the /signed loader/ must also ensure the map is exclusive, as, without exclusivity (which a hostile host could just omit when loading the loader), another BPF program with map access can mutate the contents afterwards, so the check passes on stale data.
With the extra check as part of the signed loader, it now refuses to move on with map->sha validation if the host set it up wrongly.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade linux-image-oracle-64kUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-7.0.0-1015-oemUpgrade linux-image-azure-7.0Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-generic-7.0Upgrade linux-image-generic-64kUpgrade linux-image-oem-7.0Upgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-7.0.0-1014-gcp-64kUpgrade linux-image-ibm-7.0Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-genericUpgrade linux-image-7.0.0-1014-aws-64kUpgrade linux-image-7.0.0-1008-gke-64kUpgrade linux-image-gke-64k-7.0Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-38-generic-64kUpgrade linux-image-7.0.0-1014-gcpUpgrade linux-image-gcp-64kUpgrade linux-image-gkeUpgrade linux-image-oem-26.04aUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-gcpUpgrade linux-image-azureUpgrade linux-image-7.0.0-1017-azureUpgrade linux-image-generic-64k-7.0Upgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1014-awsUpgrade linux-image-ibmUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-realtime-64kUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-aws-64k-7.0Upgrade linux-image-realtimeUpgrade linux-image-7.0.0-1015-ibmUpgrade linux-image-gke-64kUpgrade linux-image-oracleUpgrade linux-image-realtime-7.0Upgrade linux-image-azure-lts-26.04Upgrade linux-image-azure-fde-7.0Upgrade linux-image-awsUpgrade linux-image-7.0.0-38-realtimeUpgrade linux-image-7.0.0-1013-oracle-64kUpgrade linux-image-virtual-7.0Upgrade linux-image-oracle-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gke-7.0Upgrade linux-image-virtualUpgrade linux-image-7.0.0-1008-gkeUpgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-1013-oracleUpgrade linux-image-azure-fdeUpgrade linux-image-7.0.0-38-realtime-64kUpgrade linux-image-7.0.0-38-genericUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-realtime-64k-7.0 | Oct 7, 2026 | Oct 6, 2026 |
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