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CVE-2026-43088 medium CVSS 5.5

Vulnerability in Linux kernel (CVE-2026-43088)

Summary

Vulnerability in Linux kernel (CVE-2026-43088). Risk of unauthorized operations or information disclosure. Exploitable via SADB_ACQUIRE.

Original description

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved:

net: af_key: zero aligned sockaddr tail in PF_KEY exports

PF_KEY export paths use pfkey_sockaddr_size() when reserving sockaddr
payload space, so IPv6 addresses occupy 32 bytes on the wire. However,
pfkey_sockaddr_fill() initializes only the first 28 bytes of
struct sockaddr_in6, leaving the final 4 aligned bytes uninitialized.

Not every PF_KEY message is affected. The state and policy dump builders
already zero the whole message buffer before filling the sockaddr
payloads. Keep the fix to the export paths that still append aligned
sockaddr payloads with plain skb_put():

  • SADB_ACQUIRE
  • SADB_X_NAT_T_NEW_MAPPING
  • SADB_X_MIGRATE

Fix those paths by clearing only the aligned sockaddr tail after
pfkey_sockaddr_fill().

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-2026-43088 has been found in Linux kernel.
Attackers can target a specific entry point like SADB_ACQUIRE over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-43088" on the vendor's site.

CVE-2026-43088 (Linux kernel) — CVSS v3 5.5
Attack vector: local / no user interaction
Attack surface: SADB_ACQUIRE / SADB_X_NAT_T_NEW_MAPPING / SADB_X_MIGRATE
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.

❓ What is the problem

A vulnerability (unclassified) exists in Linux kernel. Attackers reach the vulnerable code path via SADB_ACQUIRE.

📍 Affected scope

Check the vendor advisory for the affected versions of Linux kernel. Attack surface: SADB_ACQUIRE / SADB_X_NAT_T_NEW_MAPPING / SADB_X_MIGRATE.

🔥 Severity

Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

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

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-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

References

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