debcrafters-packages team mailing list archive

[Seth Arnold <2114945@xxxxxxxxxxxxxxxxxx>]

*** This bug is a security vulnerability ***

Public security bug reported:

The Linux kernel supports a lot of different filesystem types. This is
cool, it's part of what makes Linux so flexible and helped bring Linux
to the mainstream. However, quality of filesystem implementations varies
wildly and the upstream kernel community doesn't consider flaws in
filesystems to be security issues: https://lore.kernel.org/linux-
fsdevel/20250407-biegung-furor-e7313ca9d712@brauner/

Ubuntu has decided to make it easy for users to mount filesystems, for
better or for worse.

The filesystems that have had less dedicated bug hunting bring
significant risk to Ubuntu users. We can make it harder to mount these
filesystem types without affecting most Ubuntu users through some simple
module blocklisting. System administrators can still enable these other
filesystem types with relatively easy efforts and everyone else will
have reduced risk of ring 0 privilege escalation issues.

** Affects: kmod (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2114945

Title:
  block less common filesystems by default

Status in kmod package in Ubuntu:
  New

Bug description:
  The Linux kernel supports a lot of different filesystem types. This is
  cool, it's part of what makes Linux so flexible and helped bring Linux
  to the mainstream. However, quality of filesystem implementations
  varies wildly and the upstream kernel community doesn't consider flaws
  in filesystems to be security issues: https://lore.kernel.org/linux-
  fsdevel/20250407-biegung-furor-e7313ca9d712@brauner/

  Ubuntu has decided to make it easy for users to mount filesystems, for
  better or for worse.

  The filesystems that have had less dedicated bug hunting bring
  significant risk to Ubuntu users. We can make it harder to mount these
  filesystem types without affecting most Ubuntu users through some
  simple module blocklisting. System administrators can still enable
  these other filesystem types with relatively easy efforts and everyone
  else will have reduced risk of ring 0 privilege escalation issues.

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