CVE-2026-98237: Linux kernel · net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:27 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.
References
- ubuntu.com/security/CVE-2026-98237 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98237 (opens in a new tab)
- git.kernel.org/linus/5d063822ac5184939c1ed377a339a01d8ae814e8 (opens in a new tab)
- git.kernel.org/stable/c/19b5e8dd884a530d04482e1a8e547f43cad17ed7 (opens in a new tab)
- git.kernel.org/stable/c/24ade82d6d993274e99c2c6998848751c35292e7 (opens in a new tab)
- git.kernel.org/stable/c/3ed36ee1b29b028f6bc2ebe100152f61a33df05a (opens in a new tab)
- git.kernel.org/stable/c/5d063822ac5184939c1ed377a339a01d8ae814e8 (opens in a new tab)
- git.kernel.org/stable/c/829fec45122da58d77a55a3b7ca514dafab98e77 (opens in a new tab)
- git.kernel.org/stable/c/8dad70ff7e25cbcfbcb5101fdbf36d98003eb653 (opens in a new tab)
- git.kernel.org/stable/c/e4b2c7b50d4f4aa1ddfff731b136d65f65b2b526 (opens in a new tab)