CVE-2025-38574
published 2025-08-19CVE-2025-38574: In the Linux kernel, the following vulnerability has been resolved: pptp: ensure minimal skb length in pptp_xmit() Commit aabc6596ffb3 ("net: ppp: Add bound…
high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
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 ppp_sync_txmung") fixed ppp_sync_txmunge()
We need a similar fix in pptp_xmit(), otherwise we might
read uninit data as reported by syzbot.
BUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193
pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193
ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline]
ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314
pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379
sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148
__release_sock+0x1d3/0x330 net/core/sock.c:3213
release_sock+0x6b/0x270 net/core/sock.c:3767
pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904
sock_sendmsg_nosec 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
__sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709
Affected
40 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | linux | < linux 6.1.148-1 (bookworm) | linux 6.1.148-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.148-1 (bookworm) | linux 6.1.148-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 97b8c5d322c5c0038cac4bc56fdbe237d0be426f | 97b8c5d322c5c0038cac4bc56fdbe237d0be426f |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 26672f1679b143aa34fca0b6046b7fd0c184770d | 26672f1679b143aa34fca0b6046b7fd0c184770d |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5de7513f38f3c19c0610294ee478242bea356f8c | 5de7513f38f3c19c0610294ee478242bea356f8c |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 504cc4ab91073d2ac7404ad146139f86ecee7193 | 504cc4ab91073d2ac7404ad146139f86ecee7193 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5005d24377378a20e5c0e53052fc4ebdcdcbc611 | 5005d24377378a20e5c0e53052fc4ebdcdcbc611 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ea99b88b1999ebcb24d5d3a6b7910030f40d3bba | ea99b88b1999ebcb24d5d3a6b7910030f40d3bba |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b7dcda76fd0615c0599c89f36873a6cd48e02dbb | b7dcda76fd0615c0599c89f36873a6cd48e02dbb |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1a04db0fd75cb6034fc27a56b67b3b8b9022a98c | 1a04db0fd75cb6034fc27a56b67b3b8b9022a98c |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < de9c4861fb42f0cd72da844c3c34f692d5895b7b | de9c4861fb42f0cd72da844c3c34f692d5895b7b |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.244-1 | 5.10.244-1 |
| linux | linux_kernel | >= 0 < 6.1.148-1 | 6.1.148-1 |
| linux | linux_kernel | >= 0 < 6.12.43-1 | 6.12.43-1 |
| linux | linux_kernel | >= 0 < 6.16.3-1 | 6.16.3-1 |
| linux | linux_kernel | >= 0 < 5.15.0-163.173 | 5.15.0-163.173 |
| linux | linux_kernel | >= 0 < 6.8.0-100.100 | 6.8.0-100.100 |
| linux | linux_kernel | >= 2.6.13 < 5.4.297 | 5.4.297 |
| linux | linux_kernel | >= 5.11 < 5.15.190 | 5.15.190 |
| linux | linux_kernel | >= 5.16 < 6.1.148 | 6.1.148 |
| linux | linux_kernel | >= 5.5 < 5.10.241 | 5.10.241 |
| linux | linux_kernel | >= 6.13 < 6.15.10 | 6.15.10 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH