Bug 2051444 (CVE-2022-24448) - CVE-2022-24448 kernel: nfs_atomic_open() returns uninitialized data instead of ENOTDIR
Summary: CVE-2022-24448 kernel: nfs_atomic_open() returns uninitialized data instead o...
Keywords:
Status: NEW
Alias: CVE-2022-24448
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
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Depends On: 2059727 2059728 2059729 2059730 2051445
Blocks: 2051447
TreeView+ depends on / blocked
 
Reported: 2022-02-07 09:22 UTC by Marian Rehak
Modified: 2022-06-04 08:05 UTC (History)
47 users (show)

Fixed In Version: kernel 5.16.5
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel. When an application tries to open a directory (using the O_DIRECTORY flag) in a mounted NFS filesystem, a lookup operation is performed. If the NFS server returns a file as a result of the lookup, the NFS filesystem returns an uninitialized file descriptor instead of the expected ENOTDIR value. This flaw leads to the kernel's data leak into the userspace.
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Description Marian Rehak 2022-02-07 09:22:58 UTC 
If an application sets the O_DIRECTORY flag, and tries to open a regular file, nfs_atomic_open() performs a regular lookup. If a regular file is found, ENOTDIR should occur, but the server instead returns uninitialized data in the file descriptor.

References:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ac795161c93699d600db16c1a8cc23a65a1eceaf
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16.5
Comment 1 Marian Rehak 2022-02-07 09:23:31 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2051445]
Comment 2 juneau 2022-02-07 15:46:32 UTC 
Marking OSD 3.x affected/ooss.
Marking OSD 4.x | quay-io-3 affected/delgated for low severity kernel issue.
Comment 4 Justin M. Forbes 2022-02-10 21:59:54 UTC 
This was fixed for Fedora with the 5.16.5 stable kernel updates.
Comment 8 Marco Benatto 2022-03-02 17:19:17 UTC 
Public commit for this issue:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ac795161c93699d600db16c1a8cc23a65a1eceaf
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