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CVE-2025-38574

pptp: ensure minimal skb length in pptp_xmit()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.148, 6.6.102, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 97b8c5d322c5c0038cac4bc56fdbe237d0be426f; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 26672f1679b143aa34fca0b6046b7fd0c184770d; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 5de7513f38f3c19c0610294ee478242bea356f8c; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 504cc4ab91073d2ac7404ad146139f86ecee7193; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 5005d24377378a20e5c0e53052fc4ebdcdcbc611; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in ea99b88b1999ebcb24d5d3a6b7910030f40d3bba; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in b7dcda76fd0615c0599c89f36873a6cd48e02dbb; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 1a04db0fd75cb6034fc27a56b67b3b8b9022a98c; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in de9c4861fb42f0cd72da844c3c34f692d5895b7b

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.4.297; From 5.5.0 · fixed in 5.10.241; From 5.11.0 · fixed in 5.15.190; From 5.16.0 · fixed in 6.1.148; From 6.2.0 · fixed in 6.6.102; From 6.7.0 · fixed in 6.12.42; From 6.13.0 · fixed in 6.15.10; From 6.16.0 · fixed in 6.16.1

References 9

git.kernel.org