Guest-memory access via grant-revocation race
Published Mar 10, 2022 · Updated Aug 3, 2024
Race condition in Linux blkfront PV drivers allows attackers controlling a malicious Xen backend to read and write guest memory pages. The frontend checks whether a grant is in use, then assumes its later revocation succeeds even if the backend maps the page between those operations. Exploitation requires a Linux guest using a PV block device and an attacker-controlled backend; the retained mapping exposes pages after I/O ends.
Summary
What happened
Race condition in Linux blkfront PV drivers allows attackers controlling a malicious Xen backend to read and write guest memory pages. The frontend checks whether a grant is in use, then assumes its later revocation succeeds even if the backend maps the page between those operations. Exploitation requires a Linux guest using a PV block device and an attacker-controlled backend; the retained mapping exposes pages after I/O ends.
The record
- CVE
- CVE-2022-23036
- Published
- Mar 10, 2022
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Mar 10, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
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Published CVSS scores
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Attacks
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Technologies
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