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NVD / CVE Program· CNA Linux

CVE-2026-43495: net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler

HighCVSS 8.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 35/100)

  • 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: 0.31% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0e7c074cfcd9bd93765505f9eb8b42f03ed2a744, 2b56d7903ab804481f5233a259d5f341e9fd513c, 307c5d0f36a5c74042217136da5bfbd9f7504650.

Low priority for now. Upgrade to Linux Linux 0e7c074cfcd9bd93765505f9eb8b42f03ed2a744, 2b56d7903ab804481f5233a259d5f341e9fd513c, 307c5d0f36a5c74042217136da5bfbd9f7504650 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: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler t7xx_port_enum_msg_handler() uses the modem-supplied port_count field as a loop bound over port_msg->data[] without checking that the message buffer contains sufficient data. A modem sending port_count=65535 in a 12-byte buffer triggers a slab-out-of-bounds read of up to 262140 bytes. Add a sizeof(*port_msg) check before accessing the port message header fields to guard against undersized messages. Add a struct_size() check after extracting port_count and before the loop. In t7xx_parse_host_rt_data(), guard the rt_feature header read with a remaining-buffer check before accessing data_len, validate feat_data_len against the actual remaining buffer to prevent OOB reads and signed integer overflow on offset. Pass msg_len from both call sites: skb->len at the DPMAIF path after skb_pull(), and the validated feat_data_len at the handshake path.

Published
May 21, 2026
Updated
Aug 5, 2026
EPSS
0.3% · 25th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CNA vs NVD score

NVD
—
CNA · Linux
8.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-43495

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
linuxlinux kernel

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

    • 5.19affected
    • da45d2566a1d4e260b894ff5d96be64b21c7fa79 and later · before 307c5d0f36a5c74042217136da5bfbd9f7504650affected · git
    • da45d2566a1d4e260b894ff5d96be64b21c7fa79 and later · before f94450ce5053b36002995b72d1fa1db3bb08c5bfaffected · git
    • da45d2566a1d4e260b894ff5d96be64b21c7fa79 and later · before 9855e063e063158cc5bded576382599dc3133202affected · git
    • da45d2566a1d4e260b894ff5d96be64b21c7fa79 and later · before 2b56d7903ab804481f5233a259d5f341e9fd513caffected · git
    • da45d2566a1d4e260b894ff5d96be64b21c7fa79 and later · before dd4f4c93c1488d7100b9964f2da4c8b3c29652f1affected · git
    • da45d2566a1d4e260b894ff5d96be64b21c7fa79 and later · before 0e7c074cfcd9bd93765505f9eb8b42f03ed2a744affected · git
    • before 5.19not affected · semver
    • 6.1.176 and later · up to and including 6.1.*not affected · semver
    • 6.6.140 and later · up to and including 6.6.*not affected · semver
Affected versions · NVD (6)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.19 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.140
  • linux linux kernel6.7 and later · before 6.12.88
  • linux linux kernel6.13 and later · before 6.18.30
  • linux linux kernel6.19 and later · before 7.0.7
  • linux linux kernel7.1

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.88-16.12.88-1
Debian:14linuxbefore 7.0.7-17.0.7-1
openSUSE:Tumbleweedkernel-sourcebefore 7.0.10-1.17.0.10-1.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43492May 19, 2026 · lib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl()
    22Monitor
  • ← EarlierCVE-2026-43493May 19, 2026 · crypto: pcrypt - Fix handling of MAY_BACKLOG requests
    39Monitor
  • Later →CVE-2026-43497May 21, 2026 · fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-after-free
    29Monitor

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 Linux0e7c074cfcd9bd93765505f9eb8b42f03ed2a744Vendor (CNA)
Linux Linux2b56d7903ab804481f5233a259d5f341e9fd513cVendor (CNA)
Linux Linux307c5d0f36a5c74042217136da5bfbd9f7504650Vendor (CNA)
Linux Linux9855e063e063158cc5bded576382599dc3133202Vendor (CNA)
Linux Linuxdd4f4c93c1488d7100b9964f2da4c8b3c29652f1Vendor (CNA)
Linux Linuxf94450ce5053b36002995b72d1fa1db3bb08c5bfVendor (CNA)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.0.10-1.1 · openSUSE:TumbleweedPackage 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.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

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

ATT&CK techniques

—

References

Show all references (6 more)

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

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