Description
The klsi_105_get_line_state function in drivers/usb/serial/kl5kusb105.c in the Linux kernel before 4.9.5 places uninitialized heap-memory contents into a log entry upon a failure to read the line status, which allows local users to obtain sensitive information by reading the log.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.9.6-1 | — |
| Debian 13 | linux | 4.9.6-1 | — |
| Debian 12 | linux | 4.9.6-1 | — |
| Debian 8 | linux | 3.16.39-1+deb8u1 | DSA-3791-1 |
| Debian 7 | linux | 3.2.84-2 | DLA-833-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-63.84 | USN-3208-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1003.12 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.10.0-32.36~16.04.1 | USN-3361-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1044.51 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1047.51 | USN-3208-1 |
| Ubuntu 14.04 LTS | linux | 3.13.0-157.207 | USN-3754-1 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-63.84~14.04.2 | USN-3208-2 |
Advisories 6
- USN-3361-1 linux-hwe vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3754-1 linux vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3208-1 linux, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-833-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3791-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3208-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
References
- 95715 vdb-entry
- [oss-security] 20170120 Re: CVE REQUEST: linux kernel: process with pgid zero able to crash kernel mailing-list
- USN-3754-1 vendor-advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=146cc8a17a3b4996f6805ee5c080e7101277c410
- https://github.com/torvalds/linux/commit/146cc8a17a3b4996f6805ee5c080e7101277c410
- DSA-3791 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.5
- https://bugzilla.redhat.com/show_bug.cgi?id=1416114