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CVE-2025-38574

8.6 · HIGH

In the Linux kernel, the following vulnerability has been resolved: pptp: ensure minimal skb length in pptp_xmit() Commit aabc6596ffb3 ("net: ppp: Add bound checking for skb data on ppp_sync_txmu…

Published Aug 19, 2025CWE-908EPSS 0.37%

Overview

CVE-2025-38574 is a high-severity vulnerability. It was published on August 19, 2025 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

pptp: ensure minimal skb length in pptp_xmit()

Commit aabc6596ffb3 ("net: ppp: Add bound checking for skb data

on ppp_sync_txmung") fixed ppp_sync_txmunge()

We need a similar fix in pptp_xmit(), otherwise we might

read uninit data as reported by syzbot.

BUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193

pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193

ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline]

ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314

pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379

sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148

__release_sock+0x1d3/0x330 net/core/sock.c:3213

release_sock+0x6b/0x270 net/core/sock.c:3767

pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904

sock_sendmsg_nosec net/socket.c:712 [inline]

__sock_sendmsg+0x330/0x3d0 net/socket.c:727

____sys_sendmsg+0x893/0xd80 net/socket.c:2566

___sys_s

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98cRefgit.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770dRefgit.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611Refgit.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193Refgit.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8cRefgit.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426fRefgit.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbbRefgit.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7bRefgit.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bbaReflists.debian.org/debian-lts-announce/2025/10/msg00007.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38574?

CVE-2025-38574 is a high-severity vulnerability. It was published on August 19, 2025 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2025-38574?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-38574?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38574?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38574 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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