Summary

Vulnerability in Kernel (CVE-2024-26840). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.80, 6.6.19, 6.7.7 or later.

Original description

The description as published by the source.

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

cachefiles: fix memory leak in cachefiles_add_cache()

The following memory leak was reported after unbinding /dev/cachefiles:

==================================================================
unreferenced object 0xffff9b674176e3c0 (size 192):
comm "cachefilesd2", pid 680, jiffies 4294881224
hex dump (first 32 bytes):
01 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 (crc ea38a44b):
[] kmem_cache_alloc+0x2d5/0x370
[] prepare_creds+0x26/0x2e0
[] cachefiles_determine_cache_security+0x1f/0x120
[] cachefiles_add_cache+0x13c/0x3a0
[] cachefiles_daemon_write+0x146/0x1c0
[] vfs_write+0xcb/0x520
[] ksys_write+0x69/0xf0
[] do_syscall_64+0x72/0x140
[] entry_SYSCALL_64_after_hwframe+0x6e/0x76

Put the reference count of cache_cred in cachefiles_daemon_unbind() to
fix the problem. And also put cache_cred in cachefiles_add_cache() error
branch to avoid memory leaks.

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-2024-26840 has been found in Kernel.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Kernel to 4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.80, 6.6.19, 6.7.7 or later.
If unsure, ask your IT team or search "Kernel CVE-2024-26840" on the vendor's site.

CVE-2024-26840 (Kernel)
Patched: 4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.80, 6.6.19, 6.7.7 — 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 4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.80, 6.6.19, 6.7.7.

🛡️ 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 4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.80, 6.6.19, 6.7.7
```
ステージング環境で 4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.80, 6.6.19, 6.7.7 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":"2.6.30"},{"fixed":"4.19.309"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.80"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.7.7"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2024-26840 linux Fixed in: 5.10.216-1
Ubuntu UBUNTU-CVE-2024-26840 linux-aws Fixed in: 4.4.0-1134.140