CVE-2024-50035

CVE Details

Release Date:

2024-10-21

Description

In the Linux kernel, the following vulnerability has been resolved:\nppp: fix ppp_async_encode() illegal access\nsyzbot reported an issue in ppp_async_encode() [1]\nIn this case, pppoe_sendmsg() is called with a zero size.\nThen ppp_async_encode() is called with an empty skb.\nBUG: KMSAN: uninit-value in ppp_async_encode drivers/net/ppp/ppp_async.c:545 [inline]\nBUG: KMSAN: uninit-value in ppp_async_push+0xb4f/0x2660 drivers/net/ppp/ppp_async.c:675\nppp_async_encode drivers/net/ppp/ppp_async.c:545 [inline]\nppp_async_push+0xb4f/0x2660 drivers/net/ppp/ppp_async.c:675\nppp_async_send+0x130/0x1b0 drivers/net/ppp/ppp_async.c:634\nppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2280 [inline]\nppp_input+0x1f1/0xe60 drivers/net/ppp/ppp_generic.c:2304\npppoe_rcv_core+0x1d3/0x720 drivers/net/ppp/pppoe.c:379\nsk_backlog_rcv+0x13b/0x420 include/net/sock.h:1113\n__release_sock+0x1da/0x330 net/core/sock.c:3072\nrelease_sock+0x6b/0x250 net/core/sock.c:3626\npppoe_sendmsg+0x2b8/0xb90 drivers/net/ppp/pppoe.c:903\nsock_sendmsg_nosec net/socket.c:729 [inline]\n__sock_sendmsg+0x30f/0x380 net/socket.c:744\n____sys_sendmsg+0x903/0xb60 net/socket.c:2602\n___sys_sendmsg+0x28d/0x3c0 net/socket.c:2656\n__sys_sendmmsg+0x3c1/0x960 net/socket.c:2742\n__do_sys_sendmmsg net/socket.c:2771 [inline]\n__se_sys_sendmmsg net/socket.c:2768 [inline]\n__x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2768\nx64_sys_call+0xb6e/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:308\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nUninit was created at:\nslab_post_alloc_hook mm/slub.c:4092 [inline]\nslab_alloc_node mm/slub.c:4135 [inline]\nkmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4187\nkmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587\n__alloc_skb+0x363/0x7b0 net/core/skbuff.c:678\nalloc_skb include/linux/skbuff.h:1322 [inline]\nsock_wmalloc+0xfe/0x1a0 net/core/sock.c:2732\npppoe_sendmsg+0x3a7/0xb90 drivers/net/ppp/pppoe.c:867\nsock_sendmsg_nosec net/socket.c:729 [inline]\n__sock_sendmsg+0x30f/0x380 net/socket.c:744\n____sys_sendmsg+0x903/0xb60 net/socket.c:2602\n___sys_sendmsg+0x28d/0x3c0 net/socket.c:2656\n__sys_sendmmsg+0x3c1/0x960 net/socket.c:2742\n__do_sys_sendmmsg net/socket.c:2771 [inline]\n__se_sys_sendmmsg net/socket.c:2768 [inline]\n__x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2768\nx64_sys_call+0xb6e/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:308\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nCPU: 1 UID: 0 PID: 5411 Comm: syz.1.14 Not tainted 6.12.0-rc1-syzkaller-00165-g360c1f1f24c6 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024

See more information about CVE-2024-50035 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.1
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality:	High
Integrity:	None
Availability:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kernel-uek)	ELSA-2024-12884	2024-12-16
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12884	2024-12-16
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12887	2024-12-18
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12887	2024-12-18