From patchwork Mon Jul 6 10:45:06 2026 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Benjamin Robin (Schneider Electric)" X-Patchwork-Id: 91791 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAAE3C43458 for ; Mon, 6 Jul 2026 10:45:16 +0000 (UTC) Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) by mx.groups.io with SMTP id smtpd.msgproc02-g2.148319.1783334714529951981 for ; Mon, 06 Jul 2026 03:45:15 -0700 Authentication-Results: mx.groups.io; dkim=pass header.i=@bootlin.com header.s=dkim header.b=NkcSN79W; spf=pass (domain: bootlin.com, ip: 185.246.85.4, mailfrom: benjamin.robin@bootlin.com) Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id 9524B4E40CAC for ; Mon, 6 Jul 2026 10:45:12 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 6408E601A2; Mon, 6 Jul 2026 10:45:12 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 7876711BBA077; Mon, 6 Jul 2026 12:45:11 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1783334711; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=ro1hV8xCnkSsL/QB5XDoDxzY4tcV9TJ3gA5DA9AsdfU=; b=NkcSN79Wdh9YuQ33UVzXiUWqoYtly9zx+nt9wZJsRb8xsrinRwF9cUpWdXvPup+npnugqv IvVF2PKnpc44JeH79q20pCd5LnWhDGoibU8cJzkXGeVoPIK0HGVYCFgmEkaG3KrWMwCFn2 PwMrntaibBodykJHlnQNPNFO6LLSIXET4c9EJfEGwn1dq0lIxf0S0P3EB1b+5RP5hzkMEA Jio6CScXP3CrP2gNoGBHuoaQPbcOU6sQ7DZ4Vvwi3WVxeX7foiXmJk6zFDTf2PJzMg8hf2 CdT3gip83RN4zsU6r7muXjEd7vOPkmbFAEsmrTs/QJysVTPk2va9Rov6mbggcQ== From: "Benjamin Robin (Schneider Electric)" Date: Mon, 06 Jul 2026 12:45:06 +0200 Subject: [PATCH 1/2] python3: fix CVE-2026-11940 MIME-Version: 1.0 Message-Id: <20260706-fix-cves-python-master-v1-1-9a2a86be5bfd@bootlin.com> References: <20260706-fix-cves-python-master-v1-0-9a2a86be5bfd@bootlin.com> In-Reply-To: <20260706-fix-cves-python-master-v1-0-9a2a86be5bfd@bootlin.com> To: openembedded-core@lists.openembedded.org Cc: olivier.benjamin@bootlin.com, mathieu.dubois-briand@bootlin.com, pascal.eberhard@se.com, wahid.essid@se.com, "Benjamin Robin (Schneider Electric)" X-Mailer: b4 0.15.2 X-Last-TLS-Session-Version: TLSv1.3 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Mon, 06 Jul 2026 10:45:16 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/240243 tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. Signed-off-by: Benjamin Robin (Schneider Electric) --- .../python/python3/CVE-2026-11940.patch | 67 ++++++++++++++++++++++ meta/recipes-devtools/python/python3_3.14.6.bb | 1 + 2 files changed, 68 insertions(+) diff --git a/meta/recipes-devtools/python/python3/CVE-2026-11940.patch b/meta/recipes-devtools/python/python3/CVE-2026-11940.patch new file mode 100644 index 000000000000..05a5802c3965 --- /dev/null +++ b/meta/recipes-devtools/python/python3/CVE-2026-11940.patch @@ -0,0 +1,67 @@ +From e24b4e95524fbe8cd0f46aa3292e8040f0e07c83 Mon Sep 17 00:00:00 2001 +From: "Miss Islington (bot)" + <31488909+miss-islington@users.noreply.github.com> +Date: Tue, 23 Jun 2026 15:58:47 +0200 +Subject: [PATCH 1/2] gh-151558: Fix symlink escape via `tarfile` + hardlink-extraction fallback (GH-151559) + +CVE: CVE-2026-11940 +Upstream-Status: Backport [https://github.com/python/cpython/commit/27dd970bf6b17ebca7c8ed486a40ab043ed7af8f] + +Signed-off-by: Benjamin Robin +--- + Lib/tarfile.py | 3 +++ + Lib/test/test_tarfile.py | 24 ++++++++++++++++++++++++ + 2 files changed, 27 insertions(+) + +diff --git a/Lib/tarfile.py b/Lib/tarfile.py +index e6734db24f64..63f23490e8a1 100644 +--- a/Lib/tarfile.py ++++ b/Lib/tarfile.py +@@ -2782,6 +2782,9 @@ def makelink_with_filter(self, tarinfo, targetpath, + "makelink_with_filter: if filter_function is not None, " + + "extraction_root must also not be None") + try: ++ filter_function( ++ unfiltered.replace(name=tarinfo.name, deep=False), ++ extraction_root) + filtered = filter_function(unfiltered, extraction_root) + except _FILTER_ERRORS as cause: + raise LinkFallbackError(tarinfo, unfiltered.name) from cause +diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py +index d974c7d46ec1..0fc7413be8db 100644 +--- a/Lib/test/test_tarfile.py ++++ b/Lib/test/test_tarfile.py +@@ -4344,6 +4344,30 @@ def test_sneaky_hardlink_fallback(self): + self.expect_file("boom", symlink_to='../../link_here') + self.expect_file("c", symlink_to='b') + ++ @symlink_test ++ def test_sneaky_hardlink_fallback_deep(self): ++ # (CVE-2026-11940) ++ with ArchiveMaker() as arc: ++ arc.add("a/b/s", symlink_to=os.path.join("..", "escape")) ++ arc.add("s", hardlink_to=os.path.join("a", "b", "s")) ++ ++ with self.check_context(arc.open(), 'data'): ++ e = self.expect_exception( ++ tarfile.LinkFallbackError, ++ "link 's' would be extracted as a copy of " ++ + "'a/b/s', which was rejected") ++ self.assertIsInstance(e.__cause__, ++ tarfile.LinkOutsideDestinationError) ++ ++ for filter in 'tar', 'fully_trusted': ++ with self.subTest(filter), self.check_context(arc.open(), filter): ++ if not os_helper.can_symlink(): ++ self.expect_file("a/") ++ self.expect_file("a/b/") ++ else: ++ self.expect_file("a/b/s", symlink_to=os.path.join('..', 'escape')) ++ self.expect_file("s", symlink_to=os.path.join('..', 'escape')) ++ + @symlink_test + def test_exfiltration_via_symlink(self): + # (CVE-2025-4138) +-- +2.54.0 diff --git a/meta/recipes-devtools/python/python3_3.14.6.bb b/meta/recipes-devtools/python/python3_3.14.6.bb index 6dfd22fc0fb6..23fc152950ea 100644 --- a/meta/recipes-devtools/python/python3_3.14.6.bb +++ b/meta/recipes-devtools/python/python3_3.14.6.bb @@ -22,6 +22,7 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \ file://0001-Avoid-shebang-overflow-on-python-config.py.patch \ file://0001-Update-test_sysconfig-for-posix_user-purelib.patch \ file://0001-prefer-valid-entrypoints.patch \ + file://CVE-2026-11940.patch \ " SRC_URI:append:class-native = " \ file://0001-Lib-sysconfig.py-use-prefix-value-from-build-configu.patch \