Vulnerability in Kernel (CVE-2022-49911)

Summary

Vulnerability in Kernel (CVE-2022-49911). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 5.15.78, 6.0.8 or later.

Original description

The description as published by the source.

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

netfilter: ipset: enforce documented limit to prevent allocating huge memory

Daniel Xu reported that the hash:net,iface type of the ipset subsystem does
not limit adding the same network with different interfaces to a set, which
can lead to huge memory usage or allocation failure.

The quick reproducer is

$ ipset create ACL.IN.ALL_PERMIT hash:net,iface hashsize 1048576 timeout 0
$ for i in $(seq 0 100); do /sbin/ipset add ACL.IN.ALL_PERMIT 0.0.0.0/0,kaf_$i timeout 0 -exist; done

The backtrace when vmalloc fails:

    [Tue Oct 25 00:13:08 2022] ipset: vmalloc error: size 1073741848, exceeds total pages
    <...>
    [Tue Oct 25 00:13:08 2022] Call Trace:
    [Tue Oct 25 00:13:08 2022]  
    [Tue Oct 25 00:13:08 2022]  dump_stack_lvl+0x48/0x60
    [Tue Oct 25 00:13:08 2022]  warn_alloc+0x155/0x180
    [Tue Oct 25 00:13:08 2022]  __vmalloc_node_range+0x72a/0x760
    [Tue Oct 25 00:13:08 2022]  ? hash_netiface4_add+0x7c0/0xb20
    [Tue Oct 25 00:13:08 2022]  ? __kmalloc_large_node+0x4a/0x90
    [Tue Oct 25 00:13:08 2022]  kvmalloc_node+0xa6/0xd0
    [Tue Oct 25 00:13:08 2022]  ? hash_netiface4_resize+0x99/0x710
    <...>

The fix is to enforce the limit documented in the ipset(8) manpage:

The internal restriction of the hash:net,iface set type is that the same
network prefix cannot be stored with more than 64 different interfaces
in a single set.

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-2022-49911 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 5.15.78, 6.0.8 or later.
If unsure, ask your IT team or search "Kernel CVE-2022-49911" on the vendor's site.

CVE-2022-49911 (Kernel)
Patched: 5.15.78, 6.0.8 — 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 5.15.78, 6.0.8.

🛡️ 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 5.15.78, 6.0.8
```
ステージング環境で 5.15.78, 6.0.8 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":"5.11.0"},{"fixed":"5.15.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.0.8"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2022-49911 linux Fixed in: 6.0.8-1
Ubuntu UBUNTU-CVE-2022-49911 linux-hwe-edge