Linux Kernel up to 6.18.39/7.1.4 Xe GPU SVM Notifier Lock drm_gpusvm.c xe_pt_svm_userptr_pre_commit locking

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.97+

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.18.39/7.1.4 and classified as problematic. This affects the function xe_pt_svm_userptr_pre_commit of the file drivers/gpu/drm/drm_gpusvm.c of the component Xe GPU SVM Notifier Lock. Performing a manipulation results in locking. This vulnerability is known as CVE-2026-80606. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.18.39/7.1.4. This affects the function xe_pt_svm_userptr_pre_commit of the file drivers/gpu/drm/drm_gpusvm.c of the component Xe GPU SVM Notifier Lock. The manipulation with an unknown input leads to a locking vulnerability. CWE is classifying the issue as CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. This is going to have an impact on integrity, and availability. The summary by CVE is:

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)

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-80606 since 08/26/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/28/2026).

Upgrading to version 6.18.40 or 7.1.5 eliminates this vulnerability. Applying the patch f9a9abd7bbdab3dfe1b1155e1457dc02b5e14ea5/ab9ea5c943c7e780124e75b7ffad9f1c752b2579/dca6e08c923a44d2d66b955e03dd57a3a38c2b94 is able to eliminate this problem.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Locking
CWE: CWE-667
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.40/7.1.5
Patch: f9a9abd7bbdab3dfe1b1155e1457dc02b5e14ea5/ab9ea5c943c7e780124e75b7ffad9f1c752b2579/dca6e08c923a44d2d66b955e03dd57a3a38c2b94

Timelineinfo

08/26/2026 CVE reserved
08/28/2026 +2 days Advisory disclosed
08/28/2026 +0 days VulDB entry created
08/28/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80606 (🔒)
GCVE (CVE): GCVE-0-2026-80606
GCVE (VulDB): GCVE-100-396525

Entryinfo

Created: 08/28/2026 09:53
Changes: 08/28/2026 09:53 (60)
Complete: 🔍
Cache ID: 216::103

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