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Summary
vulnerability in linux (CVE-2026-43197). Confidential information can be exposed externally.
AI summary openai / gpt-4o
A critical vulnerability was found in the Linux kernel's netconsole. Attackers can exploit this without user interaction to steal information or disrupt system functionality. This unique bug can be mitigated by applying the latest security patches. Organizations should ensure that affected systems are patched to maintain security.
A vulnerability in the "netconsole" module of the Linux kernel allows for out-of-bounds reads due to non-null-terminated messages from the console subsystem. This was identified by a KASAN report showing slab-out-of-bounds in "string+0x1f7/0x240". Affected versions are unspecified but have been fixed in commit "3126a2f98beaec5a554a1fb31c46db1e8542665e". No specific workarounds are provided, and patching to the latest version is recommended. This vulnerability is critical because it allows remote exploitation without authentication or user interaction.
❓ What is the problem
Non-null-terminated messages in netconsole leading to out-of-bounds reads.
📍 Affected scope
Linux kernel's netconsole module.
🔥 Severity
Critical due to potential for information disclosure and system availability impact, exploitable remotely.
🔧 How to fix
Update to the latest kernel version including commit 3126a2f98beaec5a554a1fb31c46db1e8542665e.
🛡️ Workaround
No specific workaround available; apply latest patch.
🔍 Detection
Monitor for unusual string access patterns or KASAN reports related to netconsole.
Related past incidents Similar incidents extracted from past CVEs
A vulnerability in Linux that allowed unauthorized access to kernel memory.
Another severe vulnerability in the Linux kernel that could be exploited remotely.
Linux kernel vulnerability also involving out-of-bounds access.
If this happens at your company Expected impact per business scenario
📌 In an enterprise server environment running multiple instances of Linux.
Unauthorized disclosure of sensitive data and potential service denial.
📌 In a cloud environment utilizing Linux-based containers.
Compromise of container integrity leading to data breaches.
📌 On critical infrastructure systems employing Linux for network management.
System outages and disruption of critical network services.
Recommended action
Apply the latest kernel updates to all affected systems and monitor for unusual console message activity.
Response Actions (7 steps)
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.依存マニフェストで影響コンポーネントを特定する。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- web https://git.kernel.org/stable/c/3126a2f98beaec5a554a1fb31c46db1e8542665e
- web https://git.kernel.org/stable/c/74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58
- web https://git.kernel.org/stable/c/82aec772fca2223bc5774bd9af486fd95766e578
- web https://nvd.nist.gov/vuln/detail/CVE-2026-43197
- web https://github.com/advisories/GHSA-25mj-mfqw-xqm2