Riskcovery

CVE-2026-98237

net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain

State
Published
Severity
Not scored
Published
Oct 6, 2026
Updated
Oct 19, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c to before 3ed36ee1b29b028f6bc2ebe100152f61a33df05aAffected
  • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c to before e4b2c7b50d4f4aa1ddfff731b136d65f65b2b526Affected
  • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c to before 19b5e8dd884a530d04482e1a8e547f43cad17ed7Affected
  • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c to before 24ade82d6d993274e99c2c6998848751c35292e7Affected
  • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c to before 8dad70ff7e25cbcfbcb5101fdbf36d98003eb653Affected
  • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c to before 829fec45122da58d77a55a3b7ca514dafab98e77Affected
  • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c to before 5d063822ac5184939c1ed377a339a01d8ae814e8Affected
LinuxLinux
  • 5.15Affected
  • before 5.15Not affected
  • 5.15.222 through 5.15.*Not affected
  • 6.1.189 through 6.1.*Not affected
  • 6.6.158 through 6.6.*Not affected
  • 6.12.112 through 6.12.*Not affected
  • 6.18.54 through 6.18.*Not affected
  • 7.2.8 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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