Summary

Vulnerability in Kernel (CVE-2022-50396). Risk of unauthorized operations or information disclosure. Exploitable via old_r. Mitigation: upgrade to 4.14.308, 4.19.276, 5.4.229, 5.4.235, 5.10.163, 5.10.173, 5.15.87, 5.15.100, 6.0.19, 6.1.5, 6.1.18, 6.2.5 or later.

Original description

The description as published by the source.

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

net: sched: fix memory leak in tcindex_set_parms

Syzkaller reports a memory leak as follows:

BUG: memory leak
unreferenced object 0xffff88810c287f00 (size 256):
comm "syz-executor105", pid 3600, jiffies 4294943292 (age 12.990s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[] kmalloc_trace+0x20/0x90 mm/slab_common.c:1046
[] kmalloc include/linux/slab.h:576 [inline]
[] kmalloc_array include/linux/slab.h:627 [inline]
[] kcalloc include/linux/slab.h:659 [inline]
[] tcf_exts_init include/net/pkt_cls.h:250 [inline]
[] tcindex_set_parms+0xa7/0xbe0 net/sched/cls_tcindex.c:342
[] tcindex_change+0xdf/0x120 net/sched/cls_tcindex.c:553
[] tc_new_tfilter+0x4f2/0x1100 net/sched/cls_api.c:2147
[] rtnetlink_rcv_msg+0x4dc/0x5d0 net/core/rtnetlink.c:6082
[] netlink_rcv_skb+0x87/0x1d0 net/netlink/af_netlink.c:2540
[] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
[] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345
[] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921
[] sock_sendmsg_nosec net/socket.c:714 [inline]
[] sock_sendmsg+0x56/0x80 net/socket.c:734
[] ____sys_sendmsg+0x178/0x410 net/socket.c:2482
[] ___sys_sendmsg+0xa8/0x110 net/socket.c:2536
[…

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-2022-50396 has been found in Kernel.
Attackers can target a specific entry point like old_r over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 4.14.308, 4.19.276, 5.4.229, 5.4.235, 5.10.163, 5.10.173, 5.15.87, 5.15.100, 6.0.19, 6.1.5, 6.1.18, 6.2.5 or later.
If unsure, ask your IT team or search "Kernel CVE-2022-50396" on the vendor's site.

CVE-2022-50396 (Kernel)
Attack vector: local / no user interaction
Attack surface: old_r
Patched: 4.14.308, 4.19.276, 5.4.229, 5.4.235, 5.10.163, 5.10.173, 5.15.87, 5.15.100, 6.0.19, 6.1.5, 6.1.18, 6.2.5 — 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 old_r.

📍 Affected scope

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

🔥 Severity

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

🔧 How to fix

Update to 4.14.308, 4.19.276, 5.4.229, 5.4.235, 5.10.163, 5.10.173, 5.15.87, 5.15.100, 6.0.19, 6.1.5, 6.1.18, 6.2.5.

🛡️ 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 4.14.308, 4.19.276, 5.4.229, 5.4.235, 5.10.163, 5.10.173, 5.15.87, 5.15.100, 6.0.19, 6.1.5, 6.1.18, 6.2.5
```
ステージング環境で 4.14.308, 4.19.276, 5.4.229, 5.4.235, 5.10.163, 5.10.173, 5.15.87, 5.15.100, 6.0.19, 6.1.5, 6.1.18, 6.2.5 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":"4.9.0"},{"fixed":"4.14.308"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.276"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.229"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.4.235"},{"fixed":"5.10.163"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.10.173"},{"fixed":"5.15.87"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.15.100"},{"fixed":"6.0.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.1.0"},{"fixed":"6.1.5"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.1.18"},{"fixed":"6.2.5"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2022-50396 linux Fixed in: 5.10.178-1
Ubuntu UBUNTU-CVE-2022-50396 linux-azure