Description
The __ext4_journal_stop function in fs/ext4/ext4_jbd2.c in the Linux kernel before 4.3.3 allows local users to gain privileges or cause a denial of service (use-after-free) by leveraging improper access to a certain error field.
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 | 4.3.3-1 | — |
| Debian 13 | linux | 4.3.3-1 | — |
| Debian 12 | linux | 4.3.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux | 3.13.0-77.121 | — |
| Ubuntu 14.04 LTS | linux-lts-vivid | 3.19.0-49.55~14.04.1 | — |
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6934da9238da947628be83635e365df41064b09b
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.3
- https://github.com/torvalds/linux/commit/6934da9238da947628be83635e365df41064b09b
- https://source.android.com/security/bulletin/2016-11-01.html
- 94135 vdb-entry