drm/panthor: Add vm_bind region with kbo range overlap check

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Summary

CVECVE-2026-90409
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:40 UTC
Updated2026-10-15 11:18:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/panthor: Add vm_bind region with kbo range overlap check When a VM is created, caller has to specify the range of the address space carve-out set aside for mapping kernel BO's. That means vm_bind mappings of UM-exposed BO's should not intersect with that region, but at the moment we're not checking this. At first, I thought of giving these values to drm_gpuvm_init() through its reserve_{offset, range} arguments, but it turns out that is meant for VM address spans that are not managed through the usual drm_gpuvm split/merge circuit, so storing the end of the user VA range at VM creation time and doing a quick check in the vm_bind ioctl path was the simplest workaround. The new check also makes sure vm_bind range doesn't overflow the size of a 64-bit unsigned integer. That was already being done further down the call stack inside drm_gpuvm_sm_map -> drm_gpuvm_range_valid, but it's best to fail early in the driver before GPUVM functions are invoked so that we won't waste time allocating vm_bind context resources.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 647810ec247641eb5aec8caef818919a4518a0b1 f2be47fa8e225968eb66863657143fe900ec4bca git Not specified
CNA Linux Linux affected 647810ec247641eb5aec8caef818919a4518a0b1 761cf9c63274a5b711c3dc829601723215710d2d git Not specified
CNA Linux Linux affected 647810ec247641eb5aec8caef818919a4518a0b1 985f5e12f3cdf43030e13c2bbd154913133b5c3f git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.18.57 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/761cf9c63274a5b711c3dc829601723215710d2d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f2be47fa8e225968eb66863657143fe900ec4bca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/985f5e12f3cdf43030e13c2bbd154913133b5c3f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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