Use-After-Free in Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect (CVE-2022-42896)
Summary
Vulnerability in Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect (CVE-2022-42896). Confidential information can be exposed externally.
Original description
The description as published by the source.
There are use-after-free vulnerabilities in the Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect and l2cap_le_connect_req functions which may allow code execution and leaking kernel memory (respectively) remotely via Bluetooth. A remote attacker could execute code leaking kernel memory via Bluetooth if within proximity of the victim. We recommend upgrading past commit https://www.google.com/url https://github.com/torvalds/linux/commit/711f8c3fb3db61897080468586b970c87c61d9e4 https://www.google.com/url
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2022-42896 has been found in Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect.
Confidential information can be exposed externally. CVSS score: 8.0/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect CVE-2022-42896" on the vendor's site.
CVE-2022-42896 (Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect) — CWE-416 / CVSS v3 8.0
Attack vector: adjacent-network / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Use-after-free (CWE-416) exists in Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect.
Check the vendor advisory for the affected versions of Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect.
Severity: High (CVSS 8.0/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2022-42896 linux Fixed in: 5.10.158-1
- Ubuntu UBUNTU-CVE-2022-42896 linux-aws Fixed in: 4.4.0-1115.121
References
- patch github.com
- patch kernel.dance
- web nvd.nist.gov
- web cert-portal.siemens.com
- web github.com