Out-of-bounds access via stale zram scan bound
Published Sep 11, 2026 · Updated Sep 11, 2026
Out-of-bounds access in Linux zram allows local users to access slots beyond a reinitialized device table during a concurrent scan. read_block_state() calculates nr_pages before taking dev_lock, so a reset and smaller reinitialization leave the scan using the old table bound. Reachability requires zram memory tracking, permission to read block_state, and concurrent authority to reset and reinitialize the device; the resulting out-of-bounds access has no further published consequence.
Summary
What happened
Out-of-bounds access in Linux zram allows local users to access slots beyond a reinitialized device table during a concurrent scan. read_block_state() calculates nr_pages before taking dev_lock, so a reset and smaller reinitialization leave the scan using the old table bound. Reachability requires zram memory tracking, permission to read block_state, and concurrent authority to reset and reinitialize the device; the resulting out-of-bounds access has no further published consequence.
The record
- CVE
- CVE-2026-89719
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.18
- Affected versionversion=c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 <391f057f44a51cc9418da5cba78b014324174264
- Affected versionversion=c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 <5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3
- Affected versionversion=c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 <e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d
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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