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

CVE-2026-98236: net: wwan: mhi_wwan_mbim: check skb_copy_bits() return value

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 02eba5f36d20283f144f75d47f0354a85e4f78f0, 298659c3677bf622afa9d77549cb4a967f9541e9, 31550d585589fde1ae95bf7f7a8188b2d2fdf1c7; 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 02eba5f36d20283f144f75d47f0354a85e4f78f0, 298659c3677bf622afa9d77549cb4a967f9541e9, 31550d585589fde1ae95bf7f7a8188b2d2fdf1c7; 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: check skb_copy_bits() return value mhi_mbim_rx() ignores the return value of skb_copy_bits() when it copies each datagram out of the NTB. The datagram offset and length come from the DPE, which is only checked to lie within the NTB itself, so a modem can point a datagram outside the received skb. The copy then fails and the freshly allocated skbn is passed to netif_rx() with its uninitialized contents still in place, leaking kernel heap memory into the network stack. Free the skb and account an error when the copy fails. Verified in a QEMU guest with a fault injector pointing a DPE outside the received NTB: the copy fails, and the unpatched driver hands the uninitialized skbn to the network stack (observed as "unknown protocol" on bytes that were never written). With this check the failed datagram is dropped and counted as an rx error. Changes in v2: factor the free-and-count sequence out into mhi_mbim_rx_drop(), shared with the unknown-protocol path, as suggested by Loic Poulain.

—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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  • 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 650af68435eaee783824457d2ef78cc5c03c1e88affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 350fd3125ee26b5243935fd9e2b4d162ffba430aaffected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before dd136f1fdd1059f3bc25ede3a8def8f0ee151ce7affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 298659c3677bf622afa9d77549cb4a967f9541e9affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 02eba5f36d20283f144f75d47f0354a85e4f78f0affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 7e98216e9da08b79e07a514d2a4f7646f8c9ccb9affected · git
    • aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and later · before 31550d585589fde1ae95bf7f7a8188b2d2fdf1c7affected · 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-2026-98234Oct 6, 2026 · net/sched: hhf: cap hh_flows_limit at change time
    0Monitor
  • ← EarlierCVE-2026-98235Oct 6, 2026 · net/sched: act_api: release tail references on DELACTION failure
    0Monitor
  • Later →CVE-2026-98237Oct 6, 2026 · net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain
    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 Linux02eba5f36d20283f144f75d47f0354a85e4f78f0Vendor (CNA)
Linux Linux298659c3677bf622afa9d77549cb4a967f9541e9Vendor (CNA)
Linux Linux31550d585589fde1ae95bf7f7a8188b2d2fdf1c7Vendor (CNA)
Linux Linux350fd3125ee26b5243935fd9e2b4d162ffba430aVendor (CNA)
Linux Linux650af68435eaee783824457d2ef78cc5c03c1e88Vendor (CNA)
Linux Linux7e98216e9da08b79e07a514d2a4f7646f8c9ccb9Vendor (CNA)
Linux Linuxdd136f1fdd1059f3bc25ede3a8def8f0ee151ce7Vendor (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. TodayNov 4, 2026+29 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