Kernel memory corruption via oversized IBI payload
Published Sep 11, 2026 · Updated Sep 11, 2026
Out-of-bounds write in the Linux SVC I3C master driver allows physically proximate attackers to corrupt kernel memory via oversized IBI payloads. svc_i3c_master_handle_ibi() bounds its RX FIFO loop by the hardware FIFO size rather than the per-slot max_payload_len, so readsb() copies up to 31 bytes beyond a smaller slot. Exploitation requires an I3C target attached to a system using the SVC master driver and corrupts adjacent IBI-pool memory.
Summary
What happened
Out-of-bounds write in the Linux SVC I3C master driver allows physically proximate attackers to corrupt kernel memory via oversized IBI payloads. svc_i3c_master_handle_ibi() bounds its RX FIFO loop by the hardware FIFO size rather than the per-slot max_payload_len, so readsb() copies up to 31 bytes beyond a smaller slot. Exploitation requires an I3C target attached to a system using the SVC master driver and corrupts adjacent IBI-pool memory.
The record
- CVE
- CVE-2026-80951
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1200
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 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=5.12
- Affected versionversion=dd3c52846d5954acd43f0e771689302f27dadc28 <5697d779577e2786ff3348ae9b77020ac0cf0aab
- Affected versionversion=dd3c52846d5954acd43f0e771689302f27dadc28 <aac3c5aababc7fb69d5bf5b0cc52d308574e3a8c
- Affected versionversion=dd3c52846d5954acd43f0e771689302f27dadc28 <e2bda39d7f9f285ec803e200b5c1f17143d0b483
- Affected versionversion=dd3c52846d5954acd43f0e771689302f27dadc28 <f296a0d5907bf88314dfda67245f7f69d1552470
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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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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