Local privilege escalation via irqfd use-after-free
Published Sep 18, 2024 · Updated Aug 5, 2026
Use-after-free in the Linux Xen privcmd driver 6.6 through 6.6.50 and 6.7 through 6.10.9 allows local users to gain kernel privileges. privcmd_irqfd_assign() drops its locks while retaining kirqfd; a concurrent privcmd_irqfd_deassign() removes and frees that object before the first path finishes using it. A local process permitted to hold /dev/xen/privcmd can drive both sides of the race, leading to kernel-memory control or a kernel oops.
Summary
What happened
Use-after-free in the Linux Xen privcmd driver 6.6 through 6.6.50 and 6.7 through 6.10.9 allows local users to gain kernel privileges. privcmd_irqfd_assign() drops its locks while retaining kirqfd; a concurrent privcmd_irqfd_deassign() removes and frees that object before the first path finishes using it. A local process permitted to hold /dev/xen/privcmd can drive both sides of the race, leading to kernel-memory control or a kernel oops.
The record
- CVE
- CVE-2024-46762
- Published
- Sep 18, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 18, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.6
- Affected versionversion=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <112fd2f02b308564724b8e81006c254d20945c4b
- Affected versionversion=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <611ff1b1ae989a7bcce3e2a8e132ee30e968c557
- Affected versionversion=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <e997b357b13a7d95de31681fc54fcc34235fa527
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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