Kernel-memory disclosure via uninitialized SCSI buffer
Published Mar 25, 2022 · Updated Aug 2, 2024
Information disclosure in affected Linux kernel branches allows local users with CAP_SYS_ADMIN or CAP_SYS_RAWIO to read kernel memory. In sg_scsi_ioctl, blk_rq_map_kern allocates an internal request buffer without zeroing it; when the disk driver leaves that buffer untouched, the code copies its residual contents to sic->data. Exploitation requires either capability in the initial user namespace and exposes kernel memory without reported integrity or availability impact.
Summary
What happened
Information disclosure in affected Linux kernel branches allows local users with CAP_SYS_ADMIN or CAP_SYS_RAWIO to read kernel memory. In sg_scsi_ioctl, blk_rq_map_kern allocates an internal request buffer without zeroing it; when the disk driver leaves that buffer untouched, the code copies its residual contents to sic->data. Exploitation requires either capability in the initial user namespace and exposes kernel memory without reported integrity or availability impact.
The record
- CVE
- CVE-2022-0494
- Published
- Mar 25, 2022
- Updated
- Aug 2, 2024
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-200, T1005
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Mar 25, 2022CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record 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=kernel 5.17 rc5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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