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CVE-2025-37749

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: ppp: Add bound checking for skb data on ppp_sync_txmung Ensure we have enough data in linear buffer from skb before access…

Published May 1, 2025CWE-125EPSS 0.40%

Overview

CVE-2025-37749 is a high-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, 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:

net: ppp: Add bound checking for skb data on ppp_sync_txmung

Ensure we have enough data in linear buffer from skb before accessing

initial bytes. This prevents potential out-of-bounds accesses

when processing short packets.

When ppp_sync_txmung receives an incoming package with an empty

payload:

(remote) gef➤ p *(struct pppoe_hdr *) (skb->head + skb->network_header)

$18 = {

type = 0x1,

ver = 0x1,

code = 0x0,

sid = 0x2,

length = 0x0,

tag = 0xffff8880371cdb96

}

from the skb struct (trimmed)

tail = 0x16,

end = 0x140,

head = 0xffff88803346f400 "4",

data = 0xffff88803346f416 ":\377",

truesize = 0x380,

len = 0x0,

data_len = 0x0,

mac_len = 0xe,

hdr_len = 0x0,

it is not safe to access data[2].

[[email protected]: fixed subj typo]

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/1f6eb9fa87a781d5370c0de7794ae242f1a95ee5Refgit.kernel.org/stable/c/529401c8f12ecc35f9ea5d946d5a5596cf172b48Refgit.kernel.org/stable/c/6e8a6bf43cea4347121ab21bb1ed8d7bef7e732eRefgit.kernel.org/stable/c/99aa698dec342a07125d733e39aab4394b3b7e05Refgit.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821Refgit.kernel.org/stable/c/b4c836d33ca888695b2f2665f948bc1b34fbd533Refgit.kernel.org/stable/c/b78f2b458f56a5a4d976c8e01c43dbf58d3ea2caRefgit.kernel.org/stable/c/de5a4f0cba58625e88b7bebd88f780c8c0150997Refgit.kernel.org/stable/c/fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8Reflists.debian.org/debian-lts-announce/2025/05/msg00030.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-37749?

CVE-2025-37749 is a high-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2025-37749?

This vulnerability has a CVSS 3.1 base score of 8.2, 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-2025-37749?

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-2025-37749?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-37749 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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