linux-cve-announce - CVE-2024-53099: bpf: Check validity of link->type in bpf_link_show

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Message-ID: <2024112506-CVE-2024-53099-e454@gregkh>
Date: Mon, 25 Nov 2024 22:21:08 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53099: bpf: Check validity of link->type in bpf_link_show_fdinfo()

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

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

bpf: Check validity of link->type in bpf_link_show_fdinfo()

If a newly-added link type doesn't invoke BPF_LINK_TYPE(), accessing
bpf_link_type_strs[link->type] may result in an out-of-bounds access.

To spot such missed invocations early in the future, checking the
validity of link->type in bpf_link_show_fdinfo() and emitting a warning
when such invocations are missed.

The Linux kernel CVE team has assigned CVE-2024-53099 to this issue.


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

	Fixed in 6.6.62 with commit d5092b0a1aaf
	Fixed in 6.11.9 with commit b3eb1b6a9f74
	Fixed in 6.12 with commit 8421d4c8762b

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-2024-53099
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:
	kernel/bpf/syscall.c


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/d5092b0a1aaf35d77ebd8d33384d7930bec5cb5d
	https://git.kernel.org/stable/c/b3eb1b6a9f745d6941b345f0fae014dc8bb06d36
	https://git.kernel.org/stable/c/8421d4c8762bd022cb491f2f0f7019ef51b4f0a7