CVE-2025-37749

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

Severity Score

7.1

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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]. [pabeni@redhat.com: fixed subj typo]

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]. [pabeni@redhat.com: fixed subj typo]

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2025-04-16 CVE Reserved
2025-05-01 CVE Published
2025-05-02 CVE Updated
2025-05-02 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (10)

URL	Tag	Source
https://git.kernel.org/stable/c/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/529401c8f12ecc35f9ea5d946d5a5596cf172b48	2025-05-02
https://git.kernel.org/stable/c/de5a4f0cba58625e88b7bebd88f780c8c0150997	2025-05-02
https://git.kernel.org/stable/c/99aa698dec342a07125d733e39aab4394b3b7e05	2025-05-02
https://git.kernel.org/stable/c/b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca	2025-04-25
https://git.kernel.org/stable/c/fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8	2025-04-25
https://git.kernel.org/stable/c/b4c836d33ca888695b2f2665f948bc1b34fbd533	2025-04-20
https://git.kernel.org/stable/c/1f6eb9fa87a781d5370c0de7794ae242f1a95ee5	2025-04-20
https://git.kernel.org/stable/c/6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e	2025-04-20
https://git.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821	2025-04-10

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 5.4.293 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 5.4.293"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 5.10.237 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 5.10.237"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 5.15.181 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 5.15.181"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 6.1.135 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 6.1.135"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 6.6.88 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 6.6.88"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 6.12.24 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 6.12.24"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 6.13.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 6.13.12"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 6.14.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 6.14.3"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.12 < 6.15-rc2 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.12 < 6.15-rc2"		en		Affected