Kernel heap corruption via unbounded vBIOS write
Published Sep 24, 2026 · Updated Sep 24, 2026
A buffer overflow in affected Linux kernel branches before 6.12.111 and 6.18.53 allows local users to overwrite kernel heap memory. The psp_vbflash bin_attribute sets size to zero, so VFS does not cap the write offset and length before amdgpu_psp_vbflash_write copies into a 16 MiB allocation. Exploitation requires local write access to the AMD GPU vBIOS-update sysfs attribute on hardware that exposes IFWI updates, with kernel-memory corruption as the bounded consequence.
Summary
What happened
A buffer overflow in affected Linux kernel branches before 6.12.111 and 6.18.53 allows local users to overwrite kernel heap memory. The psp_vbflash bin_attribute sets size to zero, so VFS does not cap the write offset and length before amdgpu_psp_vbflash_write copies into a 16 MiB allocation. Exploitation requires local write access to the AMD GPU vBIOS-update sysfs attribute on hardware that exposes IFWI updates, with kernel-memory corruption as the bounded consequence.
The record
- CVE
- CVE-2026-97425
- Published
- Sep 24, 2026
- Updated
- Sep 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 24, 2026CVE publishedPublication date reported by the CVE source.
- Sep 24, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <6.12.111
- Affected versionversion=0 <6.18.53
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29fef371331e87311822000535f491ffc3d7a64f
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6229898d46c0cbc238a6fe9f11c1ea12cf8bb9c5
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7b2af01ee2ecfb8f2289dc83524d8fb1ec72992
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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