Bug 1992810 (CVE-2021-38208) - CVE-2021-38208 kernel: NULL pointer dereference in net/nfc/llcp_sock.c by making a getsockname call after a certain type of failure of a bind call
Summary: CVE-2021-38208 kernel: NULL pointer dereference in net/nfc/llcp_sock.c by mak...
Keywords:
Status: NEW
Alias: CVE-2021-38208
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
: CVE-2021-3587 (view as bug list)
Depends On: 1992811 1992937
Blocks: 1968059 1968758 1992812
TreeView+ depends on / blocked
 
Reported: 2021-08-11 18:49 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-09-15 05:47 UTC (History)
44 users (show)

Fixed In Version: kernel 5.13-rc5
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernels NFC implementation, A NULL pointer dereference and BUG leading to a denial of service can be triggered by a local unprivileged user causing a kernel panic.
Clone Of:
Environment:
Last Closed:


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Description Guilherme de Almeida Suckevicz 2021-08-11 18:49:32 UTC
A flaw in the Linux kernels NFC implementation allowed local unpriviledged  users to cause a kernel panic to create a denial of service (NULL pointer dereference and BUG) by making a getsockname call after a certain type of failure of a bind call.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4ac06a1e013cf5fdd963317ffd3b968560f33bba

Comment 1 Guilherme de Almeida Suckevicz 2021-08-11 18:50:03 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1992811]

Comment 6 Justin M. Forbes 2021-08-12 13:34:15 UTC
This was fixed for Fedora with the 5.12.10 stable kernel updates.

Comment 7 Gianluca Gabrielli 2021-08-20 09:51:40 UTC
this is a duplicate of 1968057 [0].

[0] https://bugzilla.redhat.com/show_bug.cgi?id=1968057

Comment 8 Petr Matousek 2021-08-20 10:12:27 UTC
(In reply to Gianluca Gabrielli from comment #7)
> this is a duplicate of 1968057 [0].
> 
> [0] https://bugzilla.redhat.com/show_bug.cgi?id=1968057

indeed, it looks that way. thanks Gianluca for the heads up. I'm bringing it up internally so that we can initiate the process of marking one CVE as a duplicate of the other and then we're gonna deal with the flaw bugs.

thanks!
petr

Comment 9 Petr Matousek 2021-08-24 14:48:28 UTC
*** Bug 1968057 has been marked as a duplicate of this bug. ***

Comment 10 Petr Matousek 2021-08-24 14:51:41 UTC
In reply to comment #9:
> *** Bug 1968057 has been marked as a duplicate of this bug. ***

ref: https://www.openwall.com/lists/oss-security/2021/08/24/2


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