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CVE-2026-98237

Unknown

Last modified

CVE-2026-98237 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= aa730a9905b7b079ef2fffdab7f15dbb842f5c7c, < 3ed36ee1b29b028f6bc2ebe100152f61a33df05a; >= aa730a9905b7b079ef2fffdab7f15dbb842f5c7c, < e4b2c7b50d4f4aa1ddfff731b136d65f65b2b526; >= aa730a9905b7b079ef2fffdab7f15dbb842f5c7c, < 19b5e8dd884a530d04482e1a8e547f43cad17ed7; >= aa730a9905b7b079ef2fffdab7f15dbb842f5c7c, < 24ade82d6d993274e99c2c6998848751c35292e7; >= aa730a9905b7b079ef2fffdab7f15dbb842f5c7c, < 8dad70ff7e25cbcfbcb5101fdbf36d98003eb653; >= aa730a9905b7b079ef2fffdab7f15dbb842f5c7c, < 829fec45122da58d77a55a3b7ca514dafab98e77; >= aa730a9905b7b079ef2fffdab7f15dbb842f5c7c, < 5d063822ac5184939c1ed377a339a01d8ae814e8
LinuxLinux5.15

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98237?
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.
How severe is CVE-2026-98237?
Severity scoring for CVE-2026-98237 is pending analysis.
How do I fix CVE-2026-98237?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST