Bug 1775746 (CVE-2019-18885) - CVE-2019-18885 kernel: fs/btrfs/volumes.c allows a btrfs_verify_dev_extents NULL pointer dereference
Summary: CVE-2019-18885 kernel: fs/btrfs/volumes.c allows a btrfs_verify_dev_extents N...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2019-18885
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1775747
Blocks: 1775748
TreeView+ depends on / blocked
 
Reported: 2019-11-22 17:24 UTC by Guilherme de Almeida Suckevicz
Modified: 2020-04-03 06:36 UTC (History)
47 users (show)

Fixed In Version:
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Last Closed: 2020-04-03 06:36:15 UTC


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Description Guilherme de Almeida Suckevicz 2019-11-22 17:24:15 UTC
fs/btrfs/volumes.c in the Linux kernel before 5.1 allows a btrfs_verify_dev_extents NULL pointer dereference via a crafted btrfs image because fs_devices->devices is mishandled within find_device, aka CID-09ba3bc9dd15.

Reference:
https://github.com/bobfuzzer/CVE-2019-18885

Upstream commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=09ba3bc9dd150457c506e4661380a6183af651c1

Comment 1 Guilherme de Almeida Suckevicz 2019-11-22 17:25:19 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1775747]

Comment 2 Justin M. Forbes 2019-11-22 18:52:09 UTC
This was fixed for Fedora with the 5.1 kernel rebases.

Comment 3 Petr Matousek 2020-04-03 06:36:20 UTC
Statement:

The Btrfs was introduced as a Technology Preview in both Red Hat Enterprise Linux 6 and 7 but is currently deprecated and not supported in both Red Hat Enterprise Linux releases.


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