Vulnerability in Kernel (CVE-2025-22002)

Summary

Vulnerability in Kernel (CVE-2025-22002). Risk of unauthorized operations or information disclosure. Exploitable via invalidate_cache. Mitigation: upgrade to 6.12.21, 6.13.9 or later.

Original description

The description as published by the source.

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

netfs: Call invalidate_cache only if implemented

Many filesystems such as NFS and Ceph do not implement the
invalidate_cache method. On those filesystems, if writing to the
cache (NETFS_WRITE_TO_CACHE) fails for some reason, the kernel
crashes like this:

BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0
Oops: Oops: 0010 [#1] SMP PTI
CPU: 9 UID: 0 PID: 3380 Comm: kworker/u193:11 Not tainted 6.13.3-cm4all1-hp #437
Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 10/17/2018
Workqueue: events_unbound netfs_write_collection_worker
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffff9b86e2ca7dc0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 7fffffffffffffff
RDX: 0000000000000001 RSI: ffff89259d576a18 RDI: ffff89259d576900
RBP: ffff89259d5769b0 R08: ffff9b86e2ca7d28 R09: 0000000000000002
R10: ffff89258ceaca80 R11: 0000000000000001 R12: 0000000000000020
R13: ffff893d158b9338 R14: ffff89259d576900 R15: ffff89259d5769b0
FS: 0000000000000000(0000) GS:ffff893c9fa40000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000054442e003 CR4: 00000000001706f0
Call Trace:

? __die+0x1f/0x60
? page_fault_oops+0x15c/0x460
? try_to_wake_up+0x2d2/0…

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-2025-22002 has been found in Kernel.
Attackers can target a specific entry point like invalidate_cache over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 6.12.21, 6.13.9 or later.
If unsure, ask your IT team or search "Kernel CVE-2025-22002" on the vendor's site.

CVE-2025-22002 (Kernel)
Attack vector: local / no user interaction
Attack surface: invalidate_cache / NETFS_WRITE_TO_CACHE / NULL
Patched: 6.12.21, 6.13.9 — 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. Attackers reach the vulnerable code path via invalidate_cache.

📍 Affected scope

Check the vendor advisory for the affected versions of Kernel. Attack surface: invalidate_cache / NETFS_WRITE_TO_CACHE / NULL.

🔥 Severity

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

🔧 How to fix

Update to 6.12.21, 6.13.9.

🛡️ 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 6.12.21, 6.13.9
```
ステージング環境で 6.12.21, 6.13.9 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":"6.8.0"},{"fixed":"6.12.21"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.13.9"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

BellSoft Alpaquita BELL-CVE-2025-22002 linux-lts Fixed in: 6.12.41-r0
Debian DEBIAN-CVE-2025-22002 linux Fixed in: 6.12.21-1
Ubuntu UBUNTU-CVE-2025-22002 linux-hwe-edge