Issue in Linux Kernel's f2fs Functionality Impacts Performance

CVE-2026-63820

What is CVE-2026-63820?

In the Linux kernel, a flaw exists in the handling of read bio submissions within the f2fs file system, particularly when processing large folios. When a read operation encounters an error in any of the later folios, the function can leave earlier folios unsubmitted. This leads to blocked operations where readers may experience indefinite waits for read completion. The error handling process did not appropriately route pending bio submissions, which necessitates a fix to ensure that all errors are handled correctly and do not adversely affect the overall data retrieval process.

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