CVE-2026-43495

Advisory lineage Upstream: 0 Downstream: 5
Awaiting Analysis
Published: 21 May 2026, 12:12
Last modified:14 Jun 2026, 17:45

Vulnerability Summary

Overall Risk (default)
medium
35/100
CVSS Score
8.8 HIGH
v3.1 (cve.org)
EPSS Score
0.24% LOW
0% probability +0.22%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

21 May 2026, 12:12
Published
Vulnerability first disclosed
14 Jun 2026, 17:45
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 8.8CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.24%• Percentile: 15%

Affected Systems

  • linux•linux

    ≥ da45d2566a1d4e260b894ff5d96be64b21c7fa79, < f94450ce5053b36002995b72d1fa1db3bb08c5bf | ≥ da45d2566a1d4e260b894ff5d96be64b21c7fa79, < 9855e063e063158cc5bded576382599dc3133202 | ≥ da45d2566a1d4e260b894ff5d96be64b21c7fa79, < 2b56d7903ab804481f5233a259d5f341e9fd513c | ≥ da45d2566a1d4e260b894ff5d96be64b21c7fa79, < dd4f4c93c1488d7100b9964f2da4c8b3c29652f1 | ≥ da45d2566a1d4e260b894ff5d96be64b21c7fa79, < 0e7c074cfcd9bd93765505f9eb8b42f03ed2a744 | 5.19

References (5)