Vulnerability in Kernel (CVE-2022-49103)

Summary

Vulnerability in Kernel (CVE-2022-49103). Risk of unauthorized operations or information disclosure. Exploitable via ctx. Mitigation: upgrade to 5.10.111, 5.15.34, 5.16.20, 5.17.3 or later.

Original description

The description as published by the source.

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

NFSv4.2: fix reference count leaks in _nfs42_proc_copy_notify()

[You don't often get email from xiongx18@fudan.edu.cn. Learn why this is important at http://aka.ms/LearnAboutSenderIdentification.]

The reference counting issue happens in two error paths in the
function _nfs42_proc_copy_notify(). In both error paths, the function
simply returns the error code and forgets to balance the refcount of
object ctx, bumped by get_nfs_open_context() earlier, which may
cause refcount leaks.

Fix it by balancing refcount of the ctx object before the function
returns in both error paths.

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-2022-49103 has been found in Kernel.
Attackers can target a specific entry point like ctx over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 5.10.111, 5.15.34, 5.16.20, 5.17.3 or later.
If unsure, ask your IT team or search "Kernel CVE-2022-49103" on the vendor's site.

CVE-2022-49103 (Kernel)
Attack vector: local / no user interaction
Attack surface: ctx
Patched: 5.10.111, 5.15.34, 5.16.20, 5.17.3 — 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 ctx.

📍 Affected scope

Check the vendor advisory for the affected versions of Kernel. Attack surface: ctx.

🔥 Severity

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

🔧 How to fix

Update to 5.10.111, 5.15.34, 5.16.20, 5.17.3.

🛡️ 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 5.10.111, 5.15.34, 5.16.20, 5.17.3
```
ステージング環境で 5.10.111, 5.15.34, 5.16.20, 5.17.3 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":"5.5.0"},{"fixed":"5.10.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.16.20"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.17.0"},{"fixed":"5.17.3"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2022-49103 linux Fixed in: 5.10.113-1
Ubuntu UBUNTU-CVE-2022-49103 linux