Bug 2559544 (CVE-2026-98876)

Summary: CVE-2026-98876 kernel: host1x: bus: Fix missing ops null check in error teardown
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: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 Host1x bus driver. This vulnerability can lead to a Denial of Service (DoS) by causing a system crash. During device initialization error handling, the driver attempts to access client operations without first verifying their presence. A local user capable of triggering these initialization failure conditions can cause a null pointer dereference that halts the operating system.
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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 2026-10-23 11:51:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

host1x: bus: Fix missing ops null check in error teardown

In host1x_device_init(), the error teardown paths do not check
client->ops before dereferencing it, unlike the forward init paths
which correctly guard with 'client->ops &&'. This can result in a
NULL pointer dereference if client->ops is NULL.

Fix by adding the missing client->ops check in both the teardown
and teardown_late labels.
Comment 1 Mauro Matteo Cascella 2026-10-26 10:43:28 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98876.mbox