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CVE-2025-37749— net: ppp: Add bound checking for skb data on ppp_sync_txmung

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于net/ppp中对skb数据的边界检查不足，可能导致越界访问。

CVSS 8.2 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 529401c8f12ecc35f9ea5d946d5a5596cf172b48 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< de5a4f0cba58625e88b7bebd88f780c8c0150997 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 99aa698dec342a07125d733e39aab4394b3b7e05 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b4c836d33ca888695b2f2665f948bc1b34fbd533 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1f6eb9fa87a781d5370c0de7794ae242f1a95ee5 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e affected
… +12 more rows
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I. Basic Information for CVE-2025-37749

Vulnerability Information
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Vulnerability Title
net: ppp: Add bound checking for skb data on ppp_sync_txmung
Source: CVE Program / CVE List V5
Vulnerability 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]. [pabeni@redhat.com: fixed subj typo]
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于net/ppp中对skb数据的边界检查不足，可能导致越界访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 529401c8f12ecc35f9ea5d946d5a5596cf172b48 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2025-37749

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III. Intelligence Information for CVE-2025-37749

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Patches & Fixes for CVE-2025-37749 (9)

Same Patch Batch · Linux · 2025-05-01 · 245 CVEs total

CVE-2025-37750 9.8 CRITICAL smb: client: fix UAF in decryption with multichannel
CVE-2025-37778 9.8 CRITICAL ksmbd: Fix dangling pointer in krb_authenticate
CVE-2022-49770 9.8 CRITICAL ceph: avoid putting the realm twice when decoding snaps fails
CVE-2022-49931 8.8 HIGH IB/hfi1: Correctly move list in sc_disable()
CVE-2025-37776 8.8 HIGH ksmbd: fix use-after-free in smb_break_all_levII_oplock()
CVE-2025-37777 8.8 HIGH ksmbd: fix use-after-free in __smb2_lease_break_noti()
CVE-2025-37790 8.8 HIGH net: mctp: Set SOCK_RCU_FREE
CVE-2022-49910 8.8 HIGH Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu
CVE-2022-49886 8.4 HIGH x86/tdx: Panic on bad configs that #VE on "private" memory access
CVE-2025-23159 8.4 HIGH media: venus: hfi: add a check to handle OOB in sfr region
CVE-2025-37774 7.8 HIGH slab: ensure slab->obj_exts is clear in a newly allocated slab page
CVE-2025-37789 7.8 HIGH net: openvswitch: fix nested key length validation in the set() action
CVE-2025-37779 7.8 HIGH lib/iov_iter: fix to increase non slab folio refcount
CVE-2022-49920 7.8 HIGH netfilter: nf_tables: netlink notifier might race to release objects
CVE-2022-49919 7.8 HIGH netfilter: nf_tables: release flow rule object from commit path
CVE-2022-49921 7.8 HIGH net: sched: Fix use after free in red_enqueue()
CVE-2025-37752 7.8 HIGH net_sched: sch_sfq: move the limit validation
CVE-2025-37756 7.8 HIGH net: tls: explicitly disallow disconnect
CVE-2025-37761 7.8 HIGH drm/xe: Fix an out-of-bounds shift when invalidating TLB
CVE-2022-49804 7.8 HIGH s390: avoid using global register for current_stack_pointer

Showing top 20 of 245 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37749

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