CVE-2026-98237

Low risk· EPSS 7%

Published: 06/10/2026(UTC)Updated: 19/10/2026(UTC)Translated: 06/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.18%

7th percentile - higher than 7% of all known CVEs

Summary

In the Linux kernel mhi_wwan_mbim driver, mhi_mbim_rx() traverses the NDP chain and 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.

Risk Assessment

A hostile or faulty modem can hang the receive handling thread and pin a CPU at 100%, causing a denial of service (DoS) on the device.

Recommendation

Update the Linux kernel to a version containing the fix that breaks out of the loop when the next NDP offset is not larger than the current one.

Other vulnerabilities in Linux kernel (mhi_wwan_mbim driver)

CVE-2026-98236Low risk· EPSS 7%
In the Linux kernel mhi_wwan_mbim driver, mhi_mbim_rx() ignores the return value of skb_copy_bits() when copying each datagram out of the NTB. The datagram offset and length come from the DPE, which is only checked to lie within the NTB, so a modem can point a datagram outside the received skb; the copy fails and the freshly allocated skbn with uninitialized contents is passed to netif_rx(), leaking kernel heap memory.

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS