CVE-2022-48855

HIGH EPSS 13.8%
Published Jul 16, 20241y ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
High
Find Similar
Published Jul 16, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: fix kernel-infoleak for SCTP sockets syzbot reported a kernel infoleak [1] of 4 bytes. After analysis, it turned out r->idiag_expires is not initialized if inet_sctp_diag_fill() calls inet_diag_msg_common_fill() Make sure to clear idiag_timer/idiag_retrans/idiag_expires and let inet_diag_msg_sctpasoc_fill() fill them again if needed. [1] BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:154 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668 instrument_copy_to_user include/linux/instrumented.h:121 [inline] copyout lib/iov_iter.c:154 [inline] _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668 copy_to_iter include/linux/uio.h:162 [inline] simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519 __skb_datagram_iter+0x2d5/0x11b0 net/core/datagram.c:425 skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3696 [inline] netlink_recvmsg+0x669/0x1c80 net/netlink/af_netlink.c:1977 sock_recvmsg_nosec net/socket.c:948 [inline] sock_recvmsg net/socket.c:966 [inline] __sys_recvfrom+0x795/0xa10 net/socket.c:2097 __do_sys_recvfrom net/socket.c:2115 [inline] __se_sys_recvfrom net/socket.c:2111 [inline] __x64_sys_recvfrom+0x19d/0x210 net/socket.c:2111 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was created at: slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3247 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4975 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1158 [inline] netlink_dump+0x3e5/0x16c0 net/netlink/af_netlink.c:2248 __netlink_dump_start+0xcf8/0xe90 net/netlink/af_netlink.c:2373 netlink_dump_start include/linux/netlink.h:254 [inline] inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1341 sock_diag_rcv_msg+0x24a/0x620 netlink_rcv_skb+0x40c/0x7e0 net/netlink/af_netlink.c:2494 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:277 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x1093/0x1360 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x14d9/0x1720 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] sock_write_iter+0x594/0x690 net/socket.c:1061 do_iter_readv_writev+0xa7f/0xc70 do_iter_write+0x52c/0x1500 fs/read_write.c:851 vfs_writev fs/read_write.c:924 [inline] do_writev+0x645/0xe00 fs/read_write.c:967 __do_sys_writev fs/read_write.c:1040 [inline] __se_sys_writev fs/read_write.c:1037 [inline] __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Bytes 68-71 of 2508 are uninitialized Memory access of size 2508 starts at ffff888114f9b000 Data copied to user address 00007f7fe09ff2e0 CPU: 1 PID: 3478 Comm: syz-executor306 Not tainted 5.17.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
13.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥4.7  –  <4.9.307
linuxlinux_kernel*≥4.10  –  <4.14.272
linuxlinux_kernel*≥4.15  –  <4.19.235
linuxlinux_kernel*≥4.20  –  <5.4.185
linuxlinux_kernel*≥5.5  –  <5.10.106
linuxlinux_kernel*≥5.11  –  <5.15.29
linuxlinux_kernel*≥5.16  –  <5.16.15

References 8

  • git.kernel.org https://git.kernel.org/stable/c/1502f15b9f29c41883a6139f2923523873282a83
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2d8fa3fdf4542a2174a72d92018f488d65d848c5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3fc0fd724d199e061432b66a8d85b7d48fe485f7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/41a2864cf719c17294f417726edd411643462ab8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/633593a808980f82d251d0ca89730d8bb8b0220c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b7e4d9ba2ddb78801488b4c623875b81fb46b545
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bbf59d7ae558940cfa2b36a287fd1e88d83f89f8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d828b0fe6631f3ae8709ac9a10c77c5836c76a08
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1502f15b9f29c41883a6139f2923523873282a83
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2d8fa3fdf4542a2174a72d92018f488d65d848c5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3fc0fd724d199e061432b66a8d85b7d48fe485f7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/41a2864cf719c17294f417726edd411643462ab8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/633593a808980f82d251d0ca89730d8bb8b0220c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b7e4d9ba2ddb78801488b4c623875b81fb46b545
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bbf59d7ae558940cfa2b36a287fd1e88d83f89f8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d828b0fe6631f3ae8709ac9a10c77c5836c76a08
    Patch