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CVE-2026-43208
critical
CVSS 9.8
Vulnerability in linux (CVE-2026-43208)
Summary
vulnerability in linux (CVE-2026-43208). Successful exploitation can lead to full system takeover.
AI summary openai / gpt-4o
A critical vulnerability has been found in the Linux kernel's network functionality, which could allow remote attacks leading to data leaks or system downtime. Immediate updates to the Linux kernel are necessary. Similar issues have previously been noted in the "Heartbleed" vulnerability.
In the Linux kernel's network component, a vulnerability related to the handling of flow_id in the "set_rps_cpu" function has been resolved. This issue arose from incorrect assumptions about the RPS table size, potentially leading to buffer overflows. Although affected versions are not specified, applying the Git patch and updating to the latest kernel version will resolve the issue. No specific workarounds are mentioned.
❓ What is the problem
Linux kernel's network function set_rps_cpu vulnerability
📍 Affected scope
Linux kernel's network component, set_rps_cpu function
🔥 Severity
Critical, remote attack possible, confidentiality/integrity/availability highly affected
🔧 How to fix
Apply the latest patch and update the Linux kernel to the latest version
🛡️ Workaround
None specified in the material
🔍 Detection
The material does not provide specific detection methods, recommend monitoring set_rps_cpu function behavior
Related past incidents Similar incidents extracted from past CVEs
An OpenSSL cryptographic library flaw allowed unauthorized memory access similar to this kernel issue.
A critical vulnerability in Apache Log4j library that also allowed remote code execution, similar in severity.
Similar kernel network function buffer overflow leading to exploits.
If this happens at your company Expected impact per business scenario
📌 Web hosting companies using Linux-based servers
Potential unauthorized system access could lead to server compromises and data breaches.
📌 Enterprises running Linux systems in critical infrastructure
System crashes and data leakage could disrupt operations and lead to compliance issues.
📌 Cloud service providers
Service outages and data integrity issues could affect customer trust and lead to financial losses.
Recommended action
Update the Linux kernel to the latest version to mitigate this vulnerability.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
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/5455a232edea6b946b99449f15ca771a8874a5a6
- web https://git.kernel.org/stable/c/8a8a9fac9efa6423fd74938b940cb7d731780718
- web https://git.kernel.org/stable/c/ed712dc0d64dee5f0d05e4d8ca57711f8a9c850c
- web https://nvd.nist.gov/vuln/detail/CVE-2026-43208
- web https://github.com/advisories/GHSA-6cq8-8cqv-fh6c