CVE-2022-48906

MEDIUM EPSS 10.8%
Published Aug 22, 20241y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Aug 22, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: Correctly set DATA_FIN timeout when number of retransmits is large Syzkaller with UBSAN uncovered a scenario where a large number of DATA_FIN retransmits caused a shift-out-of-bounds in the DATA_FIN timeout calculation: ================================================================================ UBSAN: shift-out-of-bounds in net/mptcp/protocol.c:470:29 shift exponent 32 is too large for 32-bit type 'unsigned int' CPU: 1 PID: 13059 Comm: kworker/1:0 Not tainted 5.17.0-rc2-00630-g5fbf21c90c60 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: events mptcp_worker Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 ubsan_epilogue+0xb/0x5a lib/ubsan.c:151 __ubsan_handle_shift_out_of_bounds.cold+0xb2/0x20e lib/ubsan.c:330 mptcp_set_datafin_timeout net/mptcp/protocol.c:470 [inline] __mptcp_retrans.cold+0x72/0x77 net/mptcp/protocol.c:2445 mptcp_worker+0x58a/0xa70 net/mptcp/protocol.c:2528 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2307 worker_thread+0x95/0xe10 kernel/workqueue.c:2454 kthread+0x2f4/0x3b0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> ================================================================================ This change limits the maximum timeout by limiting the size of the shift, which keeps all intermediate values in-bounds.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
10.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥5.12.4  –  <5.13
linuxlinux_kernel*≥5.13  –  <5.15.27
linuxlinux_kernel*≥5.16  –  <5.16.13
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/03ae283bd71f761feae3f402668d698b393b0e79
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0c3f34beb459753f9f80d0cc14c1b50ab615c631
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/877d11f0332cd2160e19e3313e262754c321fa36
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/03ae283bd71f761feae3f402668d698b393b0e79
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0c3f34beb459753f9f80d0cc14c1b50ab615c631
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/877d11f0332cd2160e19e3313e262754c321fa36
    Patch