CVE-2026-98237
Received
Received - Intake
Denial of Service in Linux Kernel MHI WWAN MBIM Driver
Vulnerability report for CVE-2026-98237, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-06
Last updated on: 2026-10-06
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain
The NDP traversal in mhi_mbim_rx() only stops when wNextNdpIndex is
zero. Nothing requires the offsets to advance, so a modem that
points an NDP at itself, or at an earlier NDP, keeps the loop
spinning forever on one CPU.
Break out when the next NDP offset is not larger than the current
one.
Verified in a QEMU guest with a fault injector feeding the driver's
receive callback an NTB whose single NDP points at itself: the
unpatched driver spins in mhi_mbim_rx() with one CPU pinned at 100%
and the thread never returns. With this check the loop terminates
within one iteration.
Changes in v2: move the non-increasing check to the wNextNdpIndex
retrieval site, as suggested by Loic Poulain, instead of tracking
the previous offset in a separate variable.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | aa730a9905b7b079ef2fffdab7f15dbb842f5c7c |
| Linux | Linux | aa730a9905b7b079ef2fffdab7f15dbb842f5c7c |
| Linux | Linux | aa730a9905b7b079ef2fffdab7f15dbb842f5c7c |
| Linux | Linux | aa730a9905b7b079ef2fffdab7f15dbb842f5c7c |
| Linux | Linux | aa730a9905b7b079ef2fffdab7f15dbb842f5c7c |
| Linux | Linux | aa730a9905b7b079ef2fffdab7f15dbb842f5c7c |
| Linux | Linux | aa730a9905b7b079ef2fffdab7f15dbb842f5c7c |
| Linux | Linux | 5.15 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
