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Review reviewHigh

CVE-2026-43495

Linux Linux, linux kernel

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 extra...

CVSS
8.8
EPSS
0.26%
17.8% percentile
CISA KEV
Not listed
Published
2026.05.21
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.26%
Technical severityCVSS 8.8

Vulnerability overview

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 extra...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= da45d2566a1d4e260b894ff5d96be64b21c7fa79 < 307c5d0f36a5c74042217136da5bfbd9f7504650, >= da45d2566a1d4e260b894ff5d96be64b21c7fa79 < f94450ce5053b36002995b72d1fa1db3bb08c5bf, >= da45d2566a1d4e260b894ff5d96be64b21c7fa79 < 9855e063e063158cc5bded576382599dc3133202, >= da45d2566a1d4e260b894ff5d96be64b21c7fa79 < 2b56d7903ab804481f5233a259d5f341e9fd513c, >= da45d2566a1d4e260b894ff5d96be64b21c7fa79 < dd4f4c93c1488d7100b9964f2da4c8b3c29652f1, >= da45d2566a1d4e260b894ff5d96be64b21c7fa79 < 0e7c074cfcd9bd93765505f9eb8b42f03ed2a744, >= 5.19, >= 5.19 < 6.1.176, >= 6.2 < 6.6.140, >= 6.7 < 6.12.88, >= 6.13 < 6.18.30, >= 6.19 < 7.0.7, 7.1
Fixed versions
6.1.176, 6.6.140, 6.12.88, 6.18.30, 7.0.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-125