CVE-2026-80578 evidence review

Linux

In the Linux kernel, the following vulnerability has been resolved: fbdev: core: Fix pointer desynchronization in fb_io_read() In fb_io_read(), if copy_to_user() performs a partial copy (e.g., due to a faulty user buffer), the loop adjusts the chunk size 'c' and updates the remaining 'count'. However, the hardware 'src' pointer has already been eagerly advanced by the original chunk size. If the loop is allowed to continue, the read will resume from an incorrect, over-advanced offset. Since the remaining 'count' was only decremented by the successful bytes, this desynchronization causes the...

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Evidence review

This record remains available for product and version identification, but it is not presented as a complete remediation procedure. Confirm the affected range and the supported fix in a direct vendor advisory before changing production systems.

ProductLinux

Affected versions>= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 42bc07b4e5a3c8a02a433388f562a8f46d093e11, >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 42a6d8126c194133eafab2b0fd5c8668ebfcba5b, >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 7ff87a01ae3a8cd0208f7499386998223a8b5dba, >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 7110b7b794a2aac2c5cf8eb06ebf2af724c74d50, >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 81cc73be40c6f028f1ee3f438ace46afe666dbae, >= 6.5

Fixed versionsNo verified fixed-version field is available yet

Priority basisReview · CVSS 7.3 · EPSS -

Identify the product and installed version

Record whether Linux is present, where it is installed, and which interfaces are exposed.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Compare the affected range

Use the current record as an identification aid: >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 42bc07b4e5a3c8a02a433388f562a8f46d093e11, >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 42a6d8126c194133eafab2b0fd5c8668ebfcba5b, >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 7ff87a01ae3a8cd0208f7499386998223a8b5dba, >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 7110b7b794a2aac2c5cf8eb06ebf2af724c74d50, >= 6121cd9ef911432b14c2a17aefaf8cd2f3cfcdff < 81cc73be40c6f028f1ee3f438ace46afe666dbae, >= 6.5. Resolve incomplete inventory results before deciding that an asset is unaffected.

Verify the authoritative remediation source

Open the linked source material and locate a direct vendor advisory for this CVE. Confirm the supported fixed release and product-specific update path before making a production change.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.