CVE-2026-68102 (GCVE-0-2026-68102)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:58 – Updated: 2026-08-17 04:58
VLAI
Title
drm/amdgpu: fix aperture mapping leak
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix aperture mapping leak amdgpu_pci_remove() calls drm_dev_unplug() before invoking the driver fini routines. This causes drm_dev_enter() in amdgpu_ttm_fini() to always return false, so iounmap(aper_base_kaddr) never runs on normal driver unload, leaving an orphaned entry in the x86 PAT interval tree. On connected_to_cpu hardware, the aperture is mapped write-back (WB) via ioremap_cache(). On reload, IP discovery calls memremap(..., MEMREMAP_WC) over the same range. The WC vs WB conflict causes: ioremap error for 0x..., requested 0x1, got 0x0 amdgpu: discovery failed: -2 Fix by switching to devres-managed mappings so cleanup is guaranteed regardless of drm_dev_enter() state: - connected_to_cpu path: devm_memremap(MEMREMAP_WB). For IORESOURCE_SYSTEM_RAM ranges this takes the try_ram_remap() shortcut, returning __va(offset) from the existing kernel direct map. No new ioremap VA or PAT entry is created, so there is nothing to orphan. - dGPU path: devm_ioremap_wc() registers iounmap() as a devres action, guaranteeing cleanup at device_del() time. Also remove iounmap(aper_base_kaddr) from amdgpu_device_unmap_mmio() since the mapping is now devres-owned. v2: Remove redundant x86_64 guard (Lijo) (cherry picked from commit d871e99879cb5fd1fa798b006b4888887e63a17a)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9d0af8b4def0de6b734ec8db08e96da0458facb6 , < 67bc3647e418e23dc0d17604bdba634a73de809f (git)
Affected: 9d0af8b4def0de6b734ec8db08e96da0458facb6 , < a343d028ad6c174da8dc6af560c51e6d140a6727 (git)
Affected: 9d0af8b4def0de6b734ec8db08e96da0458facb6 , < 6405c4e75b3bcf0e72bd7a0ff5f1ed0c475e23aa (git)
Affected: 9d0af8b4def0de6b734ec8db08e96da0458facb6 , < f5988b5c300a32ff751724ffd33d5a8d5873e4a7 (git)
Affected: 9d0af8b4def0de6b734ec8db08e96da0458facb6 , < ea772a440d56b285f4d491affac50ecd41f6b402 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        "published": "2026-08-10T13:19:54.840",
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    "redhat_vex": {
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      "current_release_date": "2026-08-31T11:44:14+00:00",
      "cve": "CVE-2026-68102",
      "id": "CVE-2026-68102",
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      "product_status:known_affected": "232",
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      "cve": "CVE-2026-68102",
      "id": "CVE-2026-68102",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68102",
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}



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