Bug 2525480 (CVE-2026-80691)

Summary: CVE-2026-80691 kernel: scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE
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
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's SCSI target iblock module. A missing null pointer check in the `iblock_execute_pr_out()` function, specifically for the `ops->pr_clear` callback during PREEMPT and RELEASE operations, allows unimplemented hooks to be called. This can lead to dereferencing a null function pointer, potentially causing a system crash and resulting in a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-08-28 07:47:10 UTC 
In the Linux kernel, the following vulnerability has been resolved:

scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE

In the iblock_execute_pr_out() function, PRO_PREEMPT,
PRO_PREEMPT_AND_ABORT, and PRO_RELEASE all perform callback capability
checks through ops->pr_clear. The error check allows unimplemented hooks
to pass through the gate, resulting dereferencing a NULL function
pointer.

Check whether the hooks that need to be called are supported.
Comment 1 gkamathe 2026-08-31 14:24:46 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082803-CVE-2026-80691-7a1c@gregkh/T