Use-after-free via premature kobject cleanup
Published Jun 3, 2026 · Updated Jun 3, 2026
Use-after-free in Linux Kernel 6.19 allows local users with CAP_SYS_ADMIN to corrupt kernel object state during xe driver binding. In xe_sriov_pf_sysfs_init(), devm_add_action_or_reset() can invoke cleanup before the kobject is initialized, causing kobject_put() to underflow its reference count and access freed state. Reaching the flaw requires administrative driver bind or unbind access and an initialization failure; the observed outcome is a kernel warning and memory-lifetime corruption in the xe probe worker.
Summary
What happened
Use-after-free in Linux Kernel 6.19 allows local users with CAP_SYS_ADMIN to corrupt kernel object state during xe driver binding. In xe_sriov_pf_sysfs_init(), devm_add_action_or_reset() can invoke cleanup before the kobject is initialized, causing kobject_put() to underflow its reference count and access freed state. Reaching the flaw requires administrative driver bind or unbind access and an initialization failure; the observed outcome is a kernel warning and memory-lifetime corruption in the xe probe worker.
The record
- CVE
- CVE-2026-46264
- Published
- Jun 3, 2026
- Updated
- Jun 3, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 3, 2026CVE publishedPublication date reported by the CVE source.
- Jun 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=5c170a4d9c530e872f2f788d95258fbaa39b4415 <6ae479b1919ee9bd0560fc7af649932dd420d010
- Affected versionversion=5c170a4d9c530e872f2f788d95258fbaa39b4415 <bf7172cd25ed182f30af2cbb9f80c730dc717d8e
- Affected versionversion=6.19
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What is affected?
Published CVSS scores
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Attacks
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