CVE-2023-52703: net/usb: kalmia: Don't pass act_len in usb_bulk_msg error path

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-21 · updated 2026-06-17
Weakness: CWE-908

Description

In the Linux kernel, the following vulnerability has been resolved: net/usb: kalmia: Don't pass act_len in usb_bulk_msg error path syzbot reported that act_len in kalmia_send_init_packet() is uninitialized when passing it to the first usb_bulk_msg error path. Jiri Pirko noted that it's pointless to pass it in the error path, and that the value that would be printed in the second error path would be the value of act_len from the first call to usb_bulk_msg.[1] With this in mind, let's just not pass act_len to the usb_bulk_msg error paths. 1: https://lore.kernel.org/lkml/Y9pY61y1nwTuzMOa@nanopsycho/

Affected products

Linux kernel: from 3.0.1 before 4.14.306; from 4.15 before 4.19.273; from 4.20 before 5.4.232; from 5.5 before 5.10.169; from 5.11 before 5.15.95; from 5.16 before 6.1.13 — fixed in 4.14.306, 4.19.273, 5.10.169, 5.15.95, 5.4.232, 6.1.13

How to fix

Upgrade to a fixed version: Linux kernel 4.14.306, 4.19.273, 5.10.169, 5.15.95. Check the vendor advisory for mitigations.

References

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