Kernel-memory disclosure and crash via stale trace pointers
Published Sep 15, 2025 · Updated Sep 15, 2025
Use-after-free in Linux kernel f2fs 5.17 through 6.0.15 and 6.1 through 6.1.1 allows local users to read kernel memory or crash. The f2fs_direct_IO_enter trace event stores a kiocb pointer in the trace ring buffer and dereferences it after the object expires. Exploitation requires an f2fs mount, enabled affected tracepoints, direct I/O or unlink activity, and access to tracefs output; a formatted trace read exposes reused kernel memory or causes a kernel oops.
Summary
What happened
Use-after-free in Linux kernel f2fs 5.17 through 6.0.15 and 6.1 through 6.1.1 allows local users to read kernel memory or crash. The f2fs_direct_IO_enter trace event stores a kiocb pointer in the trace ring buffer and dereferences it after the object expires. Exploitation requires an f2fs mount, enabled affected tracepoints, direct I/O or unlink activity, and access to tracefs output; a formatted trace read exposes reused kernel memory or causes a kernel oops.
The record
- CVE
- CVE-2022-50270
- Published
- Sep 15, 2025
- Updated
- Sep 15, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 15, 2025CVE publishedPublication date reported by the CVE source.
- Sep 15, 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=5.17
- Affected versionversion=bd984c03097b8e9b7500cba7378040ac1c697dbb <0db18eec0d9a7ee525209e31e3ac2f673545b12f
- Affected versionversion=bd984c03097b8e9b7500cba7378040ac1c697dbb <b4244ca341ea95c52ee8fa93d04f5af3e584dd37
- Affected versionversion=bd984c03097b8e9b7500cba7378040ac1c697dbb <d555aa37566c5c3728f2e52047a9722eae2aed93
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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