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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98237: net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 19b5e8dd884a530d04482e1a8e547f43cad17ed7, 24ade82d6d993274e99c2c6998848751c35292e7, 3ed36ee1b29b028f6bc2ebe100152f61a33df05a; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 19b5e8dd884a530d04482e1a8e547f43cad17ed7, 24ade82d6d993274e99c2c6998848751c35292e7, 3ed36ee1b29b028f6bc2ebe100152f61a33df05a; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.15affected
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 3ed36ee1b29b028f6bc2ebe100152f61a33df05aaffected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before e4b2c7b50d4f4aa1ddfff731b136d65f65b2b526affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 19b5e8dd884a530d04482e1a8e547f43cad17ed7affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 24ade82d6d993274e99c2c6998848751c35292e7affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 8dad70ff7e25cbcfbcb5101fdbf36d98003eb653affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 829fec45122da58d77a55a3b7ca514dafab98e77affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 5d063822ac5184939c1ed377a339a01d8ae814e8affected · git
    • before 5.15not affected · semver
    • 5.15.222 and later · up to and including 5.15.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98235Oct 6, 2026 · net/sched: act_api: release tail references on DELACTION failure
    0Monitor
  • ← EarlierCVE-2026-98236Oct 6, 2026 · net: wwan: mhi_wwan_mbim: check skb_copy_bits() return value
    0Monitor
  • Later →CVE-2026-98238Oct 6, 2026 · net: wwan: t7xx: validate the netif index in t7xx_ccmni_recv_skb()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux19b5e8dd884a530d04482e1a8e547f43cad17ed7Vendor (CNA)
Linux Linux24ade82d6d993274e99c2c6998848751c35292e7Vendor (CNA)
Linux Linux3ed36ee1b29b028f6bc2ebe100152f61a33df05aVendor (CNA)
Linux Linux5d063822ac5184939c1ed377a339a01d8ae814e8Vendor (CNA)
Linux Linux829fec45122da58d77a55a3b7ca514dafab98e77Vendor (CNA)
Linux Linux8dad70ff7e25cbcfbcb5101fdbf36d98003eb653Vendor (CNA)
Linux Linuxe4b2c7b50d4f4aa1ddfff731b136d65f65b2b526Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayOct 31, 2026+25 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records