Vulnerability in Kernel (CVE-2022-49927)

Summary

Vulnerability in Kernel (CVE-2022-49927). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 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:

nfs4: Fix kmemleak when allocate slot failed

If one of the slot allocate failed, should cleanup all the other
allocated slots, otherwise, the allocated slots will leak:

unreferenced object 0xffff8881115aa100 (size 64):
comm ""mount.nfs"", pid 679, jiffies 4294744957 (age 115.037s)
hex dump (first 32 bytes):
00 cc 19 73 81 88 ff ff 00 a0 5a 11 81 88 ff ff ...s......Z.....
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<000000007a4c434a>] nfs4_find_or_create_slot+0x8e/0x130
[<000000005472a39c>] nfs4_realloc_slot_table+0x23f/0x270
[<00000000cd8ca0eb>] nfs40_init_client+0x4a/0x90
[<00000000128486db>] nfs4_init_client+0xce/0x270
[<000000008d2cacad>] nfs4_set_client+0x1a2/0x2b0
[<000000000e593b52>] nfs4_create_server+0x300/0x5f0
[<00000000e4425dd2>] nfs4_try_get_tree+0x65/0x110
[<00000000d3a6176f>] vfs_get_tree+0x41/0xf0
[<0000000016b5ad4c>] path_mount+0x9b3/0xdd0
[<00000000494cae71>] __x64_sys_mount+0x190/0x1d0
[<000000005d56bdec>] do_syscall_64+0x35/0x80
[<00000000687c9ae4>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

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-2022-49927 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 5.15.78, 6.0.8 or later.
If unsure, ask your IT team or search "Kernel CVE-2022-49927" on the vendor's site.

CVE-2022-49927 (Kernel)
Attack vector: local / no user interaction
Patched: 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 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 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 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 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 5.15.78, 6.0.8
```
ステージング環境で 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154, 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":"3.12.0"},{"fixed":"4.9.333"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0"},{"fixed":"4.14.299"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.154"}]},{"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-2022-49927 linux Fixed in: 5.10.158-1
Ubuntu UBUNTU-CVE-2022-49927 linux-azure Fixed in: 4.15.0-1162.177~14.04.1