Kernel memory disclosure and crash via unterminated array
Published Dec 16, 2025 · Updated Dec 16, 2025
Out-of-bounds access in the Linux kernel allows local users to disclose kernel memory or crash Zen 5 systems during CPU initialization. The zen5_rdseed_microcode table lacks its required empty sentinel, so x86_match_min_microcode_rev() continues reading entries beyond the array. Exploitation requires local low-privileged access and a Zen 5 CPU; the published assessment reports no integrity impact.
Summary
What happened
Out-of-bounds access in the Linux kernel allows local users to disclose kernel memory or crash Zen 5 systems during CPU initialization. The zen5_rdseed_microcode table lacks its required empty sentinel, so x86_match_min_microcode_rev() continues reading entries beyond the array. Exploitation requires local low-privileged access and a Zen 5 CPU; the published assessment reports no integrity impact.
The record
- CVE
- CVE-2025-68195
- Published
- Dec 16, 2025
- Updated
- Dec 16, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 16, 2025CVE publishedPublication date reported by the CVE source.
- Dec 16, 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?
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- Affected versionversion=36ff93e66d0efc46e39fab536a9feec968daa766 <4c6b56a76478bd1ab609827c571905386c11d308
- Affected versionversion=607b9fb2ce248cc5b633c5949e0153838992c152 <f1fdffe0afea02ba783acfe815b6a60e7180df40
- Affected versionversion=e980de2ff109dacb6d9d3a77f01b27c467115ecb
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Technologies
Your stack
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Your stack
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