Kernel memory corruption via unchecked doorbell ID
Published Sep 24, 2026 · Updated Sep 24, 2026
Out-of-bounds write in Linux before 6.12.111 or 6.18.53 allows local users to corrupt kernel memory through CRIU queue restore. allocate_doorbell passes an unbounded userspace restore_id to __test_and_set_bit, which writes past the fixed-size doorbell_bitmap when the ID reaches the queue limit. Reaching this path requires the AMD KFD CRIU restore ioctl, administrative checkpoint-restore capability, and a supported AMD GPU; the bounded consequence is a kernel crash or memory corruption.
Summary
What happened
Out-of-bounds write in Linux before 6.12.111 or 6.18.53 allows local users to corrupt kernel memory through CRIU queue restore. allocate_doorbell passes an unbounded userspace restore_id to __test_and_set_bit, which writes past the fixed-size doorbell_bitmap when the ID reaches the queue limit. Reaching this path requires the AMD KFD CRIU restore ioctl, administrative checkpoint-restore capability, and a supported AMD GPU; the bounded consequence is a kernel crash or memory corruption.
The record
- CVE
- CVE-2026-97495
- Published
- Sep 24, 2026
- Updated
- Sep 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- admin
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 <1f087bb8cf9e8797633da35c85435e557ef74d06
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c2c89118c27cbd3adace62c5df19d15b0e96ade1
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e0cecd04a4fc4c75e375b91cf53eab5ba2e4ab7f
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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Attacks
What attackers are doing with it
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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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