Vulnerability in linux (DEBIAN-CVE-2026-31748)

Summary

Vulnerability in linux (DEBIAN-CVE-2026-31748). Successful exploitation can lead to full system takeover. Exploitable via file_length. Mitigation: upgrade to 5.10.257-1 or later.

Original description

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved: comedi: me_daq: Fix potential overrun of firmware buffer me2600_xilinx_download() loads the firmware that was requested by request_firmware(). It is possible for it to overrun the source buffer because it blindly trusts the file format. It reads a data stream length from the first 4 bytes into variable file_length and reads the data stream contents of length file_length from offset 16 onwards. Although it checks that the supplied firmware is at least 16 bytes long, it does not check that it is long enough to contain the data stream. Add a test to ensure that the supplied firmware is long enough to contain the header and the data stream. On failure, log an error and return -EINVAL.

Source: OSV.dev (Open Source Vulnerabilities) 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 DEBIAN-CVE-2026-31748 has been found in linux.
Attackers can target a specific entry point like file_length over the network to misuse the product.
Successful exploitation can lead to full system takeover.
What to do: upgrade linux to 5.10.257-1 or later.
If unsure, ask your IT team or search "linux DEBIAN-CVE-2026-31748" on the vendor's site.

DEBIAN-CVE-2026-31748 (linux)
Attack vector: local / no user interaction
Attack surface: file_length
Patched: 5.10.257-1 — 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 linux. Attackers reach the vulnerable code path via file_length.

📍 Affected scope

Check the vendor advisory for the affected versions of linux. Attack surface: file_length.

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 5.10.257-1.

🛡️ 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 'linux' . 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 'linux' . | 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 linux 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 linux to 5.10.257-1
```
ステージング環境で 5.10.257-1 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

Debian:11 linux

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.257-1"}]}]

Debian:12 linux

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.170-1"}]}]

Debian:13 linux

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.85-1"}]}]

Debian:14 linux

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.19.12-1"}]}]

Debian:11 linux-6.1

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.170-1~deb11u1"}]}]

References

advisory security-tracker.debian.org