| Headlines |
| 2023-07-27 |
Ubuntu patches custom kernel bug |
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An unusual set of circumstances has given rise to a rare occurrence: a situation where one Linux distribution contains a kernel vulnerability while others do not. The problem arose after Ubuntu introduced custom changes to its OverlayFS kernel module. This change was fine and didn't introduce any problems, until the mainline kernel made related changes which were also fine when used with the vanilla kernel. However, mixing the two sets of changes (those from Ubuntu and those from the vanilla kernel) resulted into two security vulnerabilities. "Ubuntu, as one of the distributions using OverlayFS, had implemented custom changes to its OverlayFS module in 2018, which were generally safe. However, in 2019 and 2022, the Linux kernel project made its own modifications to the module, which conflicted with Ubuntu's changes. The widespread distribution adopted the code containing these changes recently, and the conflicts caused the introduction of the two flaws. Unfortunately, the risk of exploitation is imminent, as PoCs for the two flaws have been publicly available for a long time." People running the Ubuntu distribution (or related, downstream distributions and spins) are advised to update their kernel. Bleeping Computer has the details. |
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