Kernel-pointer disclosure via uninitialized EFS response
Published Nov 23, 2022 · Updated Apr 21, 2025
Information disclosure in the Linux Kernel allows physically proximate attackers to read kernel pointers through crafted Bluetooth L2CAP traffic. The l2cap_parse_conf_req function returns an uninitialized Extended Flow Specification structure when FLAG_EFS_ENABLE is set without remote EFS data. Exploitation requires CONFIG_BT_HS and High Speed enabled through the management interface; the response exposes kernel addresses but does not write memory.
Summary
What happened
Information disclosure in the Linux Kernel allows physically proximate attackers to read kernel pointers through crafted Bluetooth L2CAP traffic. The l2cap_parse_conf_req function returns an uninitialized Extended Flow Specification structure when FLAG_EFS_ENABLE is set without remote EFS data. Exploitation requires CONFIG_BT_HS and High Speed enabled through the management interface; the response exposes kernel addresses but does not write memory.
The record
- CVE
- CVE-2022-42895
- Published
- Nov 23, 2022
- Updated
- Apr 21, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-824
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 23, 2022CVE publishedPublication date reported by the CVE source.
- Apr 21, 2025Record 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=3.0.0 <=b1a2cd50c0357f243b7435a732b4e62ba3157a2e
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Google Security Research Bluetooth L2CAP infoleak PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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