Bug 1959514 (CVE-2021-23134) - CVE-2021-23134 kernel: use-after-free in nfc sockets
Summary: CVE-2021-23134 kernel: use-after-free in nfc sockets
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-23134
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:
Depends On: 1959515
Blocks: 1959516
TreeView+ depends on / blocked
 
Reported: 2021-05-11 17:27 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-05-13 08:34 UTC (History)
43 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel. A use-after-free was found in the implementation of nfc sockets leading to a kernel privilege escalation from the context of an unprivileged user. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2021-05-13 08:34:08 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-05-11 17:27:08 UTC 
An use-after-free was found in the Linux kernel in the implementation of nfc sockets (in net/nfc/llcp_sock.c). This can lead to kernel privilege escalation from the context of an unprivileged user.

Reference:
https://www.openwall.com/lists/oss-security/2021/05/11/4

Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=c61760e6940d
Comment 1 Guilherme de Almeida Suckevicz 2021-05-11 17:27:50 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1959515]
Comment 3 Alex 2021-05-12 15:36:56 UTC 
External References:

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=c61760e6940d
Comment 4 Alex 2021-05-12 18:49:57 UTC 
Statement:

This flaw is rated as having a Moderate impact because in the default configuration, the issue can only be triggered by a privileged local user (with capability CAP_NET_RAW).
Comment 5 Product Security DevOps Team 2021-05-13 08:34:08 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-23134
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