Vulnerability in Kernel (CVE-2022-49986)

Summary

Vulnerability in Kernel (CVE-2022-49986). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 4.19.257, 5.4.212, 5.10.140, 5.15.64, 5.19.6 or later.

Original description

The description as published by the source.

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

scsi: storvsc: Remove WQ_MEM_RECLAIM from storvsc_error_wq

storvsc_error_wq workqueue should not be marked as WQ_MEM_RECLAIM as it
doesn't need to make forward progress under memory pressure. Marking this
workqueue as WQ_MEM_RECLAIM may cause deadlock while flushing a
non-WQ_MEM_RECLAIM workqueue. In the current state it causes the following
warning:

[ 14.506347] ------------[ cut here ]------------
[ 14.506354] workqueue: WQ_MEM_RECLAIM storvsc_error_wq_0:storvsc_remove_lun is flushing !WQ_MEM_RECLAIM events_freezable_power_:disk_events_workfn
[ 14.506360] WARNING: CPU: 0 PID: 8 at <-snip->kernel/workqueue.c:2623 check_flush_dependency+0xb5/0x130
[ 14.506390] CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.4.0-1086-azure #91~18.04.1-Ubuntu
[ 14.506391] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 05/09/2022
[ 14.506393] Workqueue: storvsc_error_wq_0 storvsc_remove_lun
[ 14.506395] RIP: 0010:check_flush_dependency+0xb5/0x130
<-snip->
[ 14.506408] Call Trace:
[ 14.506412] __flush_work+0xf1/0x1c0
[ 14.506414] __cancel_work_timer+0x12f/0x1b0
[ 14.506417] ? kernfs_put+0xf0/0x190
[ 14.506418] cancel_delayed_work_sync+0x13/0x20
[ 14.506420] disk_block_events+0x78/0x80
[ 14.506421] del_gendisk+0x3d/0x2f0
[ 14.506423] sr_remove+0x28/0x70
[ 14.506427] device_release_driver_internal+0xef/0x1c0
[ 14.506428] device_re…

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-2022-49986 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 4.19.257, 5.4.212, 5.10.140, 5.15.64, 5.19.6 or later.
If unsure, ask your IT team or search "Kernel CVE-2022-49986" on the vendor's site.

CVE-2022-49986 (Kernel)
Patched: 4.19.257, 5.4.212, 5.10.140, 5.15.64, 5.19.6 — 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 4.19.257, 5.4.212, 5.10.140, 5.15.64, 5.19.6.

🛡️ 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 4.19.257, 5.4.212, 5.10.140, 5.15.64, 5.19.6
```
ステージング環境で 4.19.257, 5.4.212, 5.10.140, 5.15.64, 5.19.6 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":"4.15.0"},{"fixed":"4.19.257"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.140"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.64"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.19.6"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2022-49986 linux Fixed in: 5.10.140-1
Ubuntu UBUNTU-CVE-2022-49986 linux-azure Fixed in: 4.15.0-1158.173~14.04.1