Vulnerability in Kernel (CVE-2022-48914)

Summary

Vulnerability in Kernel (CVE-2022-48914). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 4.19.233, 5.4.183, 5.10.104, 5.15.27, 5.16.13 or later.

Original description

The description as published by the source.

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

xen/netfront: destroy queues before real_num_tx_queues is zeroed

xennet_destroy_queues() relies on info->netdev->real_num_tx_queues to
delete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5
("net-sysfs: update the queue counts in the unregistration path"),
unregister_netdev() indirectly sets real_num_tx_queues to 0. Those two
facts together means, that xennet_destroy_queues() called from
xennet_remove() cannot do its job, because it's called after
unregister_netdev(). This results in kfree-ing queues that are still
linked in napi, which ultimately crashes:

BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 PID: 52 Comm: xenwatch Tainted: G        W         5.16.10-1.32.fc32.qubes.x86_64+ #226
RIP: 0010:free_netdev+0xa3/0x1a0
Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff <48> 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00
RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff
RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001…

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-2022-48914 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 4.19.233, 5.4.183, 5.10.104, 5.15.27, 5.16.13 or later.
If unsure, ask your IT team or search "Kernel CVE-2022-48914" on the vendor's site.

CVE-2022-48914 (Kernel)
Patched: 4.19.233, 5.4.183, 5.10.104, 5.15.27, 5.16.13 — 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 4.19.233, 5.4.183, 5.10.104, 5.15.27, 5.16.13.

🛡️ 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 4.19.233, 5.4.183, 5.10.104, 5.15.27, 5.16.13
```
ステージング環境で 4.19.233, 5.4.183, 5.10.104, 5.15.27, 5.16.13 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":"4.19.226"},{"fixed":"4.19.233"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.4.174"},{"fixed":"5.4.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.10.94"},{"fixed":"5.10.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.15.17"},{"fixed":"5.15.27"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.3"},{"fixed":"5.16.13"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2022-48914 linux Fixed in: 5.10.106-1