Bug 2525424 (CVE-2026-80720)

Summary: CVE-2026-80720 kernel: iomap: add a separate bio_set for iomap_split_ioend
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the iomap component of the Linux kernel. The `iomap_split_ioend` function can cause a deadlock when it attempts to split bios that originate from `iomap_ioend_bioset` and the bioset is exhausted. This can lead to a system hang, resulting in a Denial of Service (DoS) for affected systems.
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Description OSIDB Bzimport 2026-08-28 07:44:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

iomap: add a separate bio_set for iomap_split_ioend

iomap_split_ioend can split bios that already come from
iomap_ioend_bioset and thus deadlock when the bioset is exhausted.

Add a separate bio_set to avoid this deadlock.

Christian Brauner <brauner> says:
Mark iomap_ioend_split_bioset static as it is only used in ioend.c,
fixing the sparse warning reported by the kernel test robot.
Comment 1 gkamathe 2026-08-31 12:56:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082810-CVE-2026-80720-fb94@gregkh/T