CVE-2026-63959
Published: July 22, 2026Last modified: July 22, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT A broken/malicious port can transmit a CRC-valid frame whose header advertises up to seven data objects but whose body carries fewer than that. Check for this, and rightfully reject the message, instead of reading from uninitialized stack memory.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Vulnerable (6.1.177-r0) |
| 25 LTS | linux-lts | Fixed (6.12.95-r0) | |
| Stream | linux-lts | Fixed (6.18.35-r1) |
References
- https://git.kernel.org/stable/c/0af00f1459f5dd757f0d392f8caa38039561ac62
- https://git.kernel.org/stable/c/8a8cd4790b08c9f79ea2250b3bd933fd79f67e56
- https://git.kernel.org/stable/c/9b496e3371c04f0a03b7faa5d2442536d00e3998
- https://git.kernel.org/stable/c/aa2f716327be1818e1cb156da8a2844804aaec2f
- https://git.kernel.org/stable/c/c4ab8e2d4432abb646c5c0687f8dab173da901f9
- https://git.kernel.org/stable/c/dc17721d42e6d89f63572e63add8306a0e15eb3c