Bug 2482630 (CVE-2026-46211)

Summary: CVE-2026-46211 kernel: drm/msm/gem: fix error handling in msm_ioctl_gem_info_get_metadata()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's drm/msm/gem component. Improper error handling within the msm_ioctl_gem_info_get_metadata() function can lead to a NULL pointer dereference. This occurs because the function fails to check for allocation failures and incorrectly reports success even when operations fail. A local attacker could potentially exploit this to cause a denial of service (DoS) on the system.
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Description OSIDB Bzimport 2026-05-28 11:06:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/msm/gem: fix error handling in msm_ioctl_gem_info_get_metadata()

msm_ioctl_gem_info_get_metadata() always returns 0 regardless of
errors. When copy_to_user() fails or the user buffer is too small,
the error code stored in ret is ignored because the function
unconditionally returns 0. This causes userspace to believe the
ioctl succeeded when it did not.

Additionally, kmemdup() can return NULL on allocation failure, but
the return value is not checked. This leads to a NULL pointer
dereference in the subsequent copy_to_user() call.

Add the missing NULL check for kmemdup() and return ret instead of 0.

Note that the SET counterpart (msm_ioctl_gem_info_set_metadata)
correctly returns ret.

Patchwork: https://patchwork.freedesktop.org/patch/714478/
Comment 1 Keith Grant 2026-05-28 13:14:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052835-CVE-2026-46211-218a@gregkh/T