Local privilege escalation via EROFS managed-folio race
Published Jul 19, 2026 · Updated Jul 19, 2026
An EROFS race condition in Linux Kernel allows local users to escalate privileges through parallel reads of a crafted filesystem image. z_erofs_fill_bio_vec makes a managed folio visible before clearing its preallocated marker, so z_erofs_bind_cache can add and bind the same folio to another pcluster. Exploitation requires mounting an image with unaligned compressed extents and issuing concurrent reads; corruption can disclose or write kernel memory, hijack control flow, hang the host, or panic it.
Summary
What happened
An EROFS race condition in Linux Kernel allows local users to escalate privileges through parallel reads of a crafted filesystem image. z_erofs_fill_bio_vec makes a managed folio visible before clearing its preallocated marker, so z_erofs_bind_cache can add and bind the same folio to another pcluster. Exploitation requires mounting an image with unaligned compressed extents and issuing concurrent reads; corruption can disclose or write kernel memory, hijack control flow, hang the host, or panic it.
The record
- CVE
- CVE-2026-64031
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-367, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 19, 2026CVE publishedPublication date reported by the CVE source.
- Jul 19, 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=6.15
- Affected versionversion=7361d1e3763baaf7b9349c576137851458ad38d1 <038166f873c4caf6e85cfd4ea0c5a5ba297b4e8b
- Affected versionversion=7361d1e3763baaf7b9349c576137851458ad38d1 <425d32d6288d7d845e486af9419bbedccd8c9103
- Affected versionversion=7361d1e3763baaf7b9349c576137851458ad38d1 <649932fc3815eda2f24eb4de4b3a5e94886ee0b9
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
Public exploit references
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Technologies
Your stack
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Your stack
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