Protected-data disclosure via shared branch-history poisoning
Published Mar 9, 2022 · Updated Aug 3, 2024
Information disclosure in Ampere Altra, Ampere Altra Max, and AmpereOne processors allows local users to infer protected data through Spectre-BHB. Malicious code alters shared branch-history state so a victim context follows mispredicted branches, leaving measurable cache allocations. Exploitation requires low-privileged local code, precise control before the victim branch, and a usable disclosure gadget; no integrity or availability impact is documented.
Summary
What happened
Information disclosure in Ampere Altra, Ampere Altra Max, and AmpereOne processors allows local users to infer protected data through Spectre-BHB. Malicious code alters shared branch-history state so a victim context follows mispredicted branches, leaving measurable cache allocations. Exploitation requires low-privileged local code, precise control before the victim branch, and a usable disclosure gadget; no integrity or availability impact is documented.
The record
- CVE
- CVE-2022-25368
- Published
- Mar 9, 2022
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 9, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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Your stack
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