Description
The atyfb_ioctl function in drivers/video/fbdev/aty/atyfb_base.c in the Linux kernel through 4.12.10 does not initialize a certain data structure, which allows local users to obtain sensitive information from kernel stack memory by reading locations associated with padding bytes.
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 | 4.12.13-1 | — |
| Debian 13 | linux | 4.12.13-1 | — |
| Debian 12 | linux | 4.12.13-1 | — |
| Debian 9 | linux | 4.9.30-2+deb9u5 | DSA-3981-1 |
| Debian 8 | linux | 3.16.43-2+deb8u5 | DSA-3981-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | linux | 3.2.93-1 | DLA-1099-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-gcp-6.11 +4 | 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 | 3.13.0-142.191 | USN-3583-1 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-98.121~14.04.1 | USN-3469-2 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
Advisories 5
- USN-3583-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3469-1 linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3981-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1099-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3469-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
References
- https://marc.info/?l=linux-kernel&m=150453196710422&w=2
- USN-3583-2 vendor-advisory
- DSA-3981 vendor-advisory
- https://github.com/torvalds/linux/pull/441
- USN-3583-1 vendor-advisory
- 100634 vdb-entry
- https://marc.info/?l=linux-kernel&m=150401461613306&w=2