linux-cve-announce - CVE-2024-50123: bpf: Add the missing BPF_LINK

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Message-ID: <2024110556-CVE-2024-50123-5370@gregkh>
Date: Tue,  5 Nov 2024 18:11:12 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50123: bpf: Add the missing BPF_LINK_TYPE invocation for sockmap

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

bpf: Add the missing BPF_LINK_TYPE invocation for sockmap

There is an out-of-bounds read in bpf_link_show_fdinfo() for the sockmap
link fd. Fix it by adding the missing BPF_LINK_TYPE invocation for
sockmap link

Also add comments for bpf_link_type to prevent missing updates in the
future.

The Linux kernel CVE team has assigned CVE-2024-50123 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.10 with commit 699c23f02c65 and fixed in 6.11.6 with commit 6d79f12c0ce2
	Issue introduced in 6.10 with commit 699c23f02c65 and fixed in 6.12-rc5 with commit c2f803052bc7

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-50123
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	include/linux/bpf_types.h
	include/uapi/linux/bpf.h
	tools/include/uapi/linux/bpf.h


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/6d79f12c0ce2bc8ff5f109093df1734bd6450615
	https://git.kernel.org/stable/c/c2f803052bc7a7feb2e03befccc8e49b6ff1f5f5