Bug 2451257 (CVE-2026-23366)

Summary: CVE-2026-23366 kernel: drm/client: Do not destroy NULL modes
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's Direct Rendering Manager (DRM) client component. This vulnerability occurs when the system attempts to destroy an uninitialized memory pointer, specifically the 'modes' variable within the `drm_client_modeset_probe` function, after a memory allocation failure. This can lead to a NULL pointer dereference, potentially causing system instability or a denial of service.
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Description OSIDB Bzimport 2026-03-25 11:07:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/client: Do not destroy NULL modes

'modes' in drm_client_modeset_probe may fail to kcalloc.  If this
occurs, we jump to 'out', calling modes_destroy on it, which
dereferences it.  This may result in a NULL pointer dereference in the
error case.  Prevent that.
Comment 1 Alexander B 2026-03-25 12:47:22 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026032540-CVE-2026-23366-a7c4@gregkh/T