Local privilege escalation via FSI OCC teardown race
Published Dec 30, 2025 · Updated Dec 30, 2025
Use-after-free in the FSI OCC driver in Linux 5.16 and later affected branches allows local users to corrupt kernel memory. The fsi_occ_submit path accesses occ->buffer while occ_remove can free it, and open file descriptors can outlive the OCC device without a retained device reference. Reachability requires local OCC device or hwmon access on supported POWER systems and concurrent OCC or FSI teardown; exploitation enables kernel-memory disclosure, privilege escalation, or a kernel panic.
Summary
What happened
Use-after-free in the FSI OCC driver in Linux 5.16 and later affected branches allows local users to corrupt kernel memory. The fsi_occ_submit path accesses occ->buffer while occ_remove can free it, and open file descriptors can outlive the OCC device without a retained device reference. Reachability requires local OCC device or hwmon access on supported POWER systems and concurrent OCC or FSI teardown; exploitation enables kernel-memory disclosure, privilege escalation, or a kernel panic.
The record
- CVE
- CVE-2022-50785
- Published
- Dec 30, 2025
- Updated
- Dec 30, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 30, 2025CVE publishedPublication date reported by the CVE source.
- Dec 30, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3593e8efc9f0dac6be70bd5c964eadaa86bf2713
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3e1e24604031b0d83b6c2d38f54eeea265cfcc0
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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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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