CVE-2026-43495
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0e7c074cfcd9bd93765505f9eb8b42f03ed2a744Patch
- https://git.kernel.org/stable/c/2b56d7903ab804481f5233a259d5f341e9fd513cPatch
- https://git.kernel.org/stable/c/307c5d0f36a5c74042217136da5bfbd9f7504650Patch
- https://git.kernel.org/stable/c/9855e063e063158cc5bded576382599dc3133202Patch
- https://git.kernel.org/stable/c/dd4f4c93c1488d7100b9964f2da4c8b3c29652f1Patch
- https://git.kernel.org/stable/c/f94450ce5053b36002995b72d1fa1db3bb08c5bfPatch
- http://www.openwall.com/lists/oss-security/2026/06/18/1Mailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.