# CVE-2026-80606: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/xe/userptr: Hold notifier_lock for write on...

CVE-2026-80606 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80606 (version 7.1.5-1), released August 29, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-80606
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 28, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/xe/userptr: Hold notifier_lock for write on inject test path  When CONFIG_DRM_XE_USERPTR_INVAL_INJECT=y, xe_pt_svm_userptr_pre_commit() runs vma_check_userptr() with the svm notifier_lock taken for read. The test injection causes vma_check_userptr() to call xe_vma_userptr_force_invalidate(), which feeds into xe_vma_userptr_do_inval() with drm_gpusvm_ctx.in_notifier=true. That flag tells drm_gpusvm_unmap_pages() the caller already holds notifier_lock for write and only asserts the mode. Because the caller actually holds it for read, the assertion fires:    WARNING: drivers/gpu/drm/drm_gpusvm.c:1669 at \            drm_gpusvm_unmap_pages+0xd4/0x130 [drm_gpusvm_helper]   Call Trace:    xe_vma_userptr_do_inval+0x40d/0xfd0 [xe]    xe_vma_userptr_invalidate_pass1+0x3e6/0x8d0 [xe]    xe_vma_userptr_force_invalidate+0xde/0x290 [xe]    vma_check_userptr.constprop.0+0x1c6/0x220 [xe]    xe_pt_svm_userptr_pre_commit+0x6a3/0xc60 [xe]    ...    xe_vm_bind_ioctl+0x3a0a/0x4480 [xe]  Acquire notifier_lock for write in pre-commit when the inject Kconfig is enabled, via new helpers xe_pt_svm_userptr_notifier_lock()/_unlock(). Rename xe_svm_assert_held_read() to xe_svm_assert_held_read_or_inject_write() so it asserts the correct mode under each build configuration. Production builds (CONFIG_DRM_XE_USERPTR_INVAL_INJECT=n) keep the existing read-mode behavior bit-for-bit.  (cherry picked from commit 80ccbd97ffee8ad2e73167d826fe7be548364365)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.5-1 | [DEBIAN-CVE-2026-80606](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80606.md) | Aug 29, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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