linux-cve-announce - CVE-2025-38489: s390/bpf: Fix bpf_arch_text_poke() with new

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Message-ID: <2025072816-CVE-2025-38489-0fd7@gregkh>
Date: Mon, 28 Jul 2025 13:22:31 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38489: s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL again

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL again

Commit 7ded842b356d ("s390/bpf: Fix bpf_plt pointer arithmetic") has
accidentally removed the critical piece of commit c730fce7c70c
("s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL"), causing
intermittent kernel panics in e.g. perf's on_switch() prog to reappear.

Restore the fix and add a comment.

The Linux kernel CVE team has assigned CVE-2025-38489 to this issue.


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

	Issue introduced in 6.6.26 with commit c3062bdb859b6e2567e7f5c8cde20c0250bb130f and fixed in 6.6.100 with commit 0c7b20f7785cfdd59403333612c90b458b12307c
	Issue introduced in 6.9 with commit 7ded842b356d151ece8ac4985940438e6d3998bb and fixed in 6.12.40 with commit d5629d1af0600f8cc7c9245e8d832a66358ef889
	Issue introduced in 6.9 with commit 7ded842b356d151ece8ac4985940438e6d3998bb and fixed in 6.15.8 with commit a4f9c7846b1ac428921ce9676b1b8c80ed60093c
	Issue introduced in 6.9 with commit 7ded842b356d151ece8ac4985940438e6d3998bb and fixed in 6.16 with commit 6a5abf8cf182f577c7ae6c62f14debc9754ec986
	Issue introduced in 6.8.5 with commit d3d74e45a060d218fe4b0c9174f0a77517509d8e

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-2025-38489
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:
	arch/s390/net/bpf_jit_comp.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/0c7b20f7785cfdd59403333612c90b458b12307c
	https://git.kernel.org/stable/c/d5629d1af0600f8cc7c9245e8d832a66358ef889
	https://git.kernel.org/stable/c/a4f9c7846b1ac428921ce9676b1b8c80ed60093c
	https://git.kernel.org/stable/c/6a5abf8cf182f577c7ae6c62f14debc9754ec986