CVE-2026-90384
UnknownSummary
In the Linux kernel, the iomap mechanism fails to release the folio batch during zero-range operations when errors occur in the iomap_begin and iomap_end callbacks. The fix ensures cleanup is invoked on error paths and updates the helper's behavior.
Risk Assessment
This may lead to memory leaks or system instability during file operations on XFS.
Recommendation
It is recommended to update the Linux kernel to a version containing the fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: iomap: release the folio batch on iomap callback failures A sashiko review of an unrelated patch points out that the folio batch mechanism used for iomap zero range fails to release the batch in a couple error scenarios. If either calls to ->iomap_end() or ->iomap_begin() fail, the direct return paths bypass the batch cleanup. The ->iomap_end() case is not a practical issue at the moment because there is no user of the mechanism that returns an error from this path. The ->iomap_begin() case is theoretically possible because XFS can invoke the fill helper and error out at various points thereafter. This subtly complicates things because XFS does not transfer iomap_flags to the iomap data structure in the error path. To deal with both of these issues, first make sure to invoke the cleanup helper in the error path for either fs callback. Second, update the helper to clear the flag unconditionally and release the batch so long as it is populated. This more clearly delineates the purpose of the flag to control the I/O path and not necessarily the status of the fbatch, so add a comment around this as well.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS