Local kernel compromise via task_vma use-after-free
Published Jun 24, 2026 · Updated Jun 24, 2026
Use-after-free in the BPF task_vma iterator in Linux Kernel 6.7 and later allows local users to compromise the kernel during task exit. The iterator reads task->mm without alloc_lock protection and takes mmap_read_trylock() without acquiring an mmget() reference, so concurrent exit can free the non-RCU-safe mm_struct while it remains in use. A local low-privileged user must run a BPF program that reaches this iterator as the target task exits; reuse of the freed kernel object can corrupt kernel memory.
Summary
What happened
Use-after-free in the BPF task_vma iterator in Linux Kernel 6.7 and later allows local users to compromise the kernel during task exit. The iterator reads task->mm without alloc_lock protection and takes mmap_read_trylock() without acquiring an mmget() reference, so concurrent exit can free the non-RCU-safe mm_struct while it remains in use. A local low-privileged user must run a BPF program that reaches this iterator as the target task exits; reuse of the freed kernel object can corrupt kernel memory.
The record
- CVE
- CVE-2026-53085
- Published
- Jun 24, 2026
- Updated
- Jun 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 24, 2026CVE publishedPublication date reported by the CVE source.
- Jun 24, 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=4ac4546821584736798aaa9e97da9f6eaf689ea3 <239cec25a22662dbd80f57d94b38178c8be95269
- Affected versionversion=4ac4546821584736798aaa9e97da9f6eaf689ea3 <43683bb280330f3d36f0f2a3932a4867b9603e9c
- Affected versionversion=4ac4546821584736798aaa9e97da9f6eaf689ea3 <d0862de7c866c5bd7c32531f66738c21197af888
- Affected versionversion=4ac4546821584736798aaa9e97da9f6eaf689ea3 <d8e27d2d22b6e2df3a0125b8c08e9aace38c954c
- Affected versionversion=6.7
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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