Use-after-free via unlocked fbdev mode access
Published Sep 4, 2026 · Updated Sep 4, 2026
Use-after-free in Linux kernel fbdev before 7.1.11 allows local users to trigger freed-memory access via concurrent sysfs mode operations. The show_mode(), show_modes(), and store_mode() handlers access fb_info mode data without lock_fb_info() while store_modes() can replace and free the modelist. Access to an instantiated framebuffer's sysfs mode attributes is required, and the race can dereference an old entry or retain a stale freed pointer.
Summary
What happened
Use-after-free in Linux kernel fbdev before 7.1.11 allows local users to trigger freed-memory access via concurrent sysfs mode operations. The show_mode(), show_modes(), and store_mode() handlers access fb_info mode data without lock_fb_info() while store_modes() can replace and free the modelist. Access to an instantiated framebuffer's sysfs mode attributes is required, and the race can dereference an old entry or retain a stale freed pointer.
The record
- CVE
- CVE-2026-80785
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 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 <7.1.11
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <061db6b7a910b8378f3b2df64f8c0a3ddc6e85f2
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <26135631ed8e487bc6aef70cc41934e258d09bbe
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
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Public exploit references
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Technologies
Your stack
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Your stack
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