CVE-2025-37749

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Source
https://cve.org/CVERecord?id=CVE-2025-37749
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37749.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-37749
Downstream
Related
Published
2025-05-01T12:55:55.316Z
Modified
2026-03-20T12:42:24.161774Z
Summary
net: ppp: Add bound checking for skb data on ppp_sync_txmung
Details

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

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

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 pppsynctxmung receives an incoming package with an empty payload: (remote) gef➤ p *(struct pppoehdr *) (skb->head + skb->networkheader) $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, datalen = 0x0, maclen = 0xe, hdr_len = 0x0,

it is not safe to access data[2].

[pabeni@redhat.com: fixed subj typo]

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37749.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed
529401c8f12ecc35f9ea5d946d5a5596cf172b48
Fixed
de5a4f0cba58625e88b7bebd88f780c8c0150997
Fixed
99aa698dec342a07125d733e39aab4394b3b7e05
Fixed
b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca
Fixed
fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8
Fixed
b4c836d33ca888695b2f2665f948bc1b34fbd533
Fixed
1f6eb9fa87a781d5370c0de7794ae242f1a95ee5
Fixed
6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e
Fixed
aabc6596ffb377c4c9c8f335124b92ea282c9821

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37749.json"