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CVE-2026-93250 high CVSS 7.8

Vulnerability in Linux kernel (CVE-2026-93250)

Summary

Vulnerability in Linux kernel (CVE-2026-93250). Successful exploitation can lead to full system takeover.

Original description

The description as published by the source.

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

vxlan: mdb: Fix use-after-free in vxlan_mdb_flush()

vxlan_mdb_flush() iterates over the MDB entries using
hlist_for_each_entry_safe(), which only tolerates the removal of the
current entry. Contrary to the comment above the loop, the removal of an
entry can trigger the removal of another entry.

Flushing the remotes of a (*, G) entry also removes the (S, G) entries
that were created for its source list, once they are left without
remotes:

vxlan_mdb_remotes_flush()
-> vxlan_mdb_remote_del()
-> vxlan_mdb_remote_srcs_del()
-> vxlan_mdb_remote_src_del()
-> vxlan_mdb_remote_src_fwd_del()
-> __vxlan_mdb_del()
-> vxlan_mdb_entry_put()

Such an entry can be located after the (, G) entry in the list, as
vxlan_mdb_entry_get() returns an existing entry without moving it to the
head of the list. This order is obtained by adding the (S, G) entry
before the (, G) entry, the latter with NLM_F_REPLACE, as the addition
of the source otherwise fails with -EEXIST. The (S, G) entry is then the
entry saved by hlist_for_each_entry_safe() and it is freed while the
(*, G) entry is processed. The next iteration calls hlist_del() on it
again, writing LIST_POISON1 to LIST_POISON2 [1].

Besides device deletion, the flush is also reachable from RTM_DELMDB
with NLM_F_BULK.

Fix by re-reading the next entry after the remotes were flushed. The
current entry cannot be removed by this flush, a…

Source: NIST National Vulnerability Database 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-2026-93250 has been found in Linux kernel.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-93250" on the vendor's site.

CVE-2026-93250 (Linux kernel) — CVSS v3 7.8
Attack vector: local / 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.

❓ What is the problem

A vulnerability (unclassified) exists in Linux kernel.

📍 Affected scope

Check the vendor advisory for the affected versions of Linux kernel.

🔥 Severity

Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.

🔧 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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