Vulnerability in Kernel (CVE-2025-21674)

Summary

Vulnerability in Kernel (CVE-2025-21674). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 6.6.74, 6.12.11 or later.

Original description

The description as published by the source.

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

net/mlx5e: Fix inversion dependency warning while enabling IPsec tunnel

Attempt to enable IPsec packet offload in tunnel mode in debug kernel
generates the following kernel panic, which is happening due to two
issues:

In SA add section, the should be _bh() variant when marking SA mode.
There is not needed flush_workqueue in SA delete routine. It is not
needed as at this stage as it is removed from SADB and the running work
will be canceled later in SA free.

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
6.12.0+ #4 Not tainted

charon/1337 [HC0[0]:SC0[4]:HE1:SE0] is trying to acquire:
ffff88810f365020 (&xa->xa_lock#24){+.+.}-{3:3}, at: mlx5e_xfrm_del_state+0xca/0x1e0 [mlx5_core]

and this task is already holding:
ffff88813e0f0d48 (&x->lock){+.-.}-{3:3}, at: xfrm_state_delete+0x16/0x30
which would create a new lock dependency:
(&x->lock){+.-.}-{3:3} -> (&xa->xa_lock#24){+.+.}-{3:3}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&x->lock){+.-.}-{3:3}

... which became SOFTIRQ-irq-safe at:
lock_acquire+0x1be/0x520
_raw_spin_lock_bh+0x34/0x40
xfrm_timer_handler+0x91/0xd70
__hrtimer_run_queues+0x1dd/0xa60
hrtimer_run_softirq+0x146/0x2e0
handle_softirqs+0x266/0x860
irq_exit_rcu+0x115/0x1a0
sysvec_apic_timer_interrupt+0x6e/0x90
asm_sysv…

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

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-2025-21674 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 6.6.74, 6.12.11 or later.
If unsure, ask your IT team or search "Kernel CVE-2025-21674" on the vendor's site.

CVE-2025-21674 (Kernel)
Attack vector: local / no user interaction
Patched: 6.6.74, 6.12.11 — apply immediately
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 Kernel.

📍 Affected scope

Check the vendor advisory for the affected versions of Kernel.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 6.6.74, 6.12.11.

🛡️ 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. Run grep -r 'Kernel' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'Kernel' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で Kernel を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade Kernel to 6.6.74, 6.12.11
```
ステージング環境で 6.6.74, 6.12.11 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
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。

Affected packages

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"6.4.0"},{"fixed":"6.6.74"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.11"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

BellSoft Alpaquita BELL-CVE-2025-21674 linux-lts Fixed in: 6.12.41-r0
Debian DEBIAN-CVE-2025-21674 linux Fixed in: 6.12.11-1
Ubuntu UBUNTU-CVE-2025-21674 linux-hwe-edge