Kernel memory corruption via unlocked override read
Published Feb 18, 2026 · Updated Feb 18, 2026
Use-after-free in the Linux kernel fsl-mc bus driver allows local users to trigger kernel memory corruption through a sysfs race. driver_override_show() reads driver_override without device_lock while driver_override_store() can replace and free the same string under that lock. Triggering the race requires root access to write the driver_override sysfs attribute; the public record demonstrates no specific post-corruption outcome.
Summary
What happened
Use-after-free in the Linux kernel fsl-mc bus driver allows local users to trigger kernel memory corruption through a sysfs race. driver_override_show() reads driver_override without device_lock while driver_override_store() can replace and free the same string under that lock. Triggering the race requires root access to write the driver_override sysfs attribute; the public record demonstrates no specific post-corruption outcome.
The record
- CVE
- CVE-2026-23221
- Published
- Feb 18, 2026
- Updated
- Feb 18, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Feb 18, 2026CVE publishedPublication date reported by the CVE source.
- Feb 18, 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?
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- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1d6bd6183e723a7b256ff34bbb5b498b5f4f2ec0
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a2ae33e1c6361e960a4d00f7cf75d880b54f9528
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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