CVE-2025-38574

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Source
https://cve.org/CVERecord?id=CVE-2025-38574
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38574.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-38574
Downstream
Related
Published
2025-08-19T17:02:53.866Z
Modified
2026-03-20T12:42:55.421607Z
Summary
pptp: ensure minimal skb length in pptp_xmit()
Details

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 pppsynctxmung") fixed pppsynctxmunge()

We need a similar fix in pptp_xmit(), otherwise we might read uninit data as reported by syzbot.

BUG: KMSAN: uninit-value in pptpxmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 pptpxmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 pppchannelbridgeinput drivers/net/ppp/pppgeneric.c:2290 [inline] pppinput+0x1d6/0xe60 drivers/net/ppp/pppgeneric.c:2314 pppoercvcore+0x1e8/0x760 drivers/net/ppp/pppoe.c:379 skbacklogrcv+0x142/0x420 include/net/sock.h:1148 __releasesock+0x1d3/0x330 net/core/sock.c:3213 releasesock+0x6b/0x270 net/core/sock.c:3767 pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904 socksendmsgnosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x893/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 _syssendmmsg+0x2d9/0x7c0 net/socket.c:2709

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38574.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
97b8c5d322c5c0038cac4bc56fdbe237d0be426f
Fixed
26672f1679b143aa34fca0b6046b7fd0c184770d
Fixed
5de7513f38f3c19c0610294ee478242bea356f8c
Fixed
504cc4ab91073d2ac7404ad146139f86ecee7193
Fixed
5005d24377378a20e5c0e53052fc4ebdcdcbc611
Fixed
ea99b88b1999ebcb24d5d3a6b7910030f40d3bba
Fixed
b7dcda76fd0615c0599c89f36873a6cd48e02dbb
Fixed
1a04db0fd75cb6034fc27a56b67b3b8b9022a98c
Fixed
de9c4861fb42f0cd72da844c3c34f692d5895b7b

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38574.json"