CVE-2026-80720: iomap: add a separate bio_set for iomap_split_ioend
Published Aug 28, 2026
·Updated
In the Linux kernel, the following vulnerability has been resolved:
iomap: add a separate bioset for iomapsplitioend
iomapsplitioend can split bios that already come from iomapioendbioset and thus deadlock when the bioset is exhausted.
Add a separate bioset to avoid this deadlock.
Christian Brauner <brauner@kernel.org> says: Mark iomapioendsplitbioset static as it is only used in ioend.c, fixing the sparse warning reported by the kernel test robot.
Event History
Aug 28, 2026
CVE Published
via MITRE·06:53 AM
Data Sourced
via MITRE·06:53 AM
Description
Frequently Asked Questions
1
What condition leads to the deadlock?
The deadlock can occur when iomap_split_ioend splits bios that were already allocated from iomap_ioend_bioset and that bioset becomes exhausted.
2
What resolves the issue?
The fix adds a separate bio_set for iomap_split_ioend, preventing split operations from exhausting the bio_set used for iomap ioend bios.