Description
arch/arm64/mm/dma-mapping.c in the Linux kernel before 4.0.3, as used in the ION subsystem in Android and other products, does not initialize certain data structures, which allows local users to obtain sensitive information from kernel memory by triggering a dma_mmap call.
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 | 4.0.4-1 | — |
| Debian 13 | linux | 4.0.4-1 | — |
| Debian 12 | linux | 4.0.4-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux-lts-vivid | 3.19.0-22.22~14.04.1 | — |
References
- https://source.codeaurora.org/quic/la/kernel/msm-3.10/commit/?id=6e2c437a2d0a85d90d3db85a7471f99764f7bbf8
- https://github.com/torvalds/linux/commit/6829e274a623187c24f7cfc0e3d35f25d087fcc5
- http://source.android.com/security/bulletin/2016-10-01.html
- 93318 vdb-entry
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.3
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6829e274a623187c24f7cfc0e3d35f25d087fcc5