Description
The snd_msndmidi_input_read function in sound/isa/msnd/msnd_midi.c in the Linux kernel through 4.11.7 allows local users to cause a denial of service (over-boundary access) or possibly have unspecified other impact by changing the value of a message queue head pointer between two kernel reads of that value, aka a "double fetch" vulnerability.
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 | 4.13.4-1 | — |
| Debian 13 | linux | 4.13.4-1 | — |
| Debian 12 | linux | 4.13.4-1 | — |
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 | 4.4.0-98.121 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1039.48 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.13.0-1005.7 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.13.0-1002.5 | — |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1033.33 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.13.0-32.35~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1009.14 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1076.84 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1078.83 | USN-3469-1 |
| Ubuntu 14.04 LTS | linux | 3.13.0-157.207 | USN-3754-1 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-98.121~14.04.1 | USN-3469-2 |
Advisories 3
- USN-3754-1 linux vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3469-1 linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3469-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026