Bug 2460678 (CVE-2026-31436)

Summary: CVE-2026-31436 kernel: dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's dmaengine subsystem, specifically within the idxd driver. This vulnerability occurs due to incorrect descriptor completion in the `llist_abort_desc()` function. This can lead to issues such as NULL pointer dereferences, double completion, or descriptor leaks, which can result in a denial of service.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-04-22 15:04:55 UTC 
In the Linux kernel, the following vulnerability has been resolved:

dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()

At the end of this function, d is the traversal cursor of flist, but the
code completes found instead. This can lead to issues such as NULL pointer
dereferences, double completion, or descriptor leaks.

Fix this by completing d instead of found in the final
list_for_each_entry_safe() loop.
Comment 1 Keith Grant 2026-04-22 16:56:03 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042242-CVE-2026-31436-7ac7@gregkh/T