From patchwork Wed Nov 4 15:06:11 2026 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Joao Marcos Costa X-Patchwork-Id: 102919 Received: from smtpout-02.galae.net (smtpout-02.galae.net [185.246.84.56]) by mx.groups.io with SMTP id smtpd.msgproc02-g2.11147.1793804789055244493 for ; Wed, 04 Nov 2026 07:06:29 -0800 Authentication-Results: mx.groups.io; dkim=fail reason="dkim: body hash did not verify" header.i=@bootlin.com header.s=dkim header.b=ZPUxtWWV; spf=pass (domain: bootlin.com, ip: 185.246.84.56, mailfrom: joaomarcos.costa@bootlin.com) Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id CF8FB1A145C for ; Wed, 4 Nov 2026 15:06:26 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 9EBAB60770 for ; Wed, 4 Nov 2026 15:06:26 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id BCA59103291D1; Wed, 4 Nov 2026 16:06:20 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1793804782; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding; bh=8EmydrUnkDr7L0yc6z3ubNHOR2Um+R1atjpILxpmaEI=; b=ZPUxtWWVMEltfynrw8yMR5N7WvtGpCn2/ZfT9fst7y0wDkc5czvzOe8f47+Wlma8GMSdyM nTkm+ttzh9WAgKLTP5PFEmavfWCdhYrlLBAd88JJDL/YYllfSvMnOuKNS6lCkuxWQAtN2e bOs8wMQ0YwkTvrbJBlEpqrpUtK2JFBe2Glvvm+2TdbPQwZG76nK4vAkOwCR7Nuvl6VJ5ST IhXejM7eVHQFe5AOB7t8fnd8BWIQpfdcbm6VmVAGKRPKQAq26slN/TQQDlwKWDhV/HzmiC w71qvTTq/6KGOsSboCrpFsU2QsFsm9LywJEVzOrAMCF3PzQzAQvTepYl8/NGbw== From: =?utf-8?q?Jo=C3=A3o_Marcos_Costa_=28Schneider_Electric=29?= To: openembedded-core@lists.openembedded.org Cc: thomas.petazzoni@bootlin.com, =?utf-8?q?Jo=C3=A3o_Marcos_Costa_=28Schnei?= =?utf-8?q?der_Electric=29?= Subject: [scarthgap][PATCH] glibc: fix CVE-2026-84243 Date: Wed, 4 Nov 2026 16:06:11 +0100 Message-ID: <20261104150611.1720587-1-joaomarcos.costa@bootlin.com> X-Mailer: git-send-email 2.55.0 MIME-Version: 1.0 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 lin-tor-korg-lkml-alma10-1 with HTTPS for ; Wed, 04 Nov 2026 15:06:34 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/249386 This vulnerability, marked as High [1], was fixed upstream [2] since 2.45. Backport the fix to glibc v2.39. The only changes not included in the backport are the ones in NEWS file. [1] https://nvd.nist.gov/vuln/detail/cve-2026-84243 [2] https://sourceware.org/bugzilla/show_bug.cgi?id=17142 Signed-off-by: João Marcos Costa (Schneider Electric) --- .../glibc/glibc/CVE-2026-84243.patch | 193 ++++++++++++++++++ meta/recipes-core/glibc/glibc_2.39.bb | 1 + 2 files changed, 194 insertions(+) create mode 100644 meta/recipes-core/glibc/glibc/CVE-2026-84243.patch diff --git a/meta/recipes-core/glibc/glibc/CVE-2026-84243.patch b/meta/recipes-core/glibc/glibc/CVE-2026-84243.patch new file mode 100644 index 0000000000..640a166c08 --- /dev/null +++ b/meta/recipes-core/glibc/glibc/CVE-2026-84243.patch @@ -0,0 +1,193 @@ +From 02449c3a9751f801d49a41952291a6c09a24de15 Mon Sep 17 00:00:00 2001 +From: Avinal Kumar +Date: Mon, 2 Nov 2026 17:18:03 -0300 +Subject: [PATCH] intl: Restrict path traversal when using LANGUAGE env var [BZ + #17142, CVE-2026-84243] +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +The fix for CVE-2014-0475 (Bug 17137) added valid_locale_name() in +locale/findlocale.c to reject locale names containing ".." path +components. However, the LANGUAGE environment variable processing in +intl/dcigettext.c was not covered by that fix. An attacker who can +set LANGUAGE (e.g. via SSH AcceptEnv) can force any gettext-using +program to load a crafted .mo file from an arbitrary filesystem +location via directory traversal. A crafted .mo file can crash the +program through out-of-range offsets or through format-string +translations that consume more arguments than the caller passes, +causing undefined behaviour in *printf. glibc cannot fully protect +against the latter at the gettext level. The safety of .mo files +normally relies on them being produced by msgmerge and msgfmt -c and +installed in read-only locations; path traversal bypasses this trust +model. + +Remove the ENABLE_SECURE gate from the IS_PATH_WITH_DIR check so it +applies to all binaries, not just SUID/SGID ones, and extend it to +also reject the bare ".." entry which contains no directory separator +but still names the parent directory. + +Add tst-gettext-path-traversal to verify that locale names containing +path separators or equal to ".." are rejected by the LANGUAGE processing loop. + +This fixes bug 17142 and CVE-2026-84243. + +Suggested-by: Adhemerval Zanella +Signed-off-by: Avinal Kumar +Reviewed-by: Adhemerval Zanella + +CVE: CVE-2026-84243 +Upstream-Status: Backport [https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=03067f3c5e39aec5ec250a44bc1b395a1afd45e8] + +Signed-off-by: João Marcos Costa (Schneider Electric) +--- + intl/Makefile | 4 ++ + intl/dcigettext.c | 8 +-- + intl/tst-gettext-path-traversal.c | 83 +++++++++++++++++++++++++++++++ + 3 files changed, 91 insertions(+), 4 deletions(-) + create mode 100644 intl/tst-gettext-path-traversal.c + +diff --git a/intl/Makefile b/intl/Makefile +index 9b79198e68..02b217d471 100644 +--- a/intl/Makefile ++++ b/intl/Makefile +@@ -53,6 +53,7 @@ $(objpfx)plural.o: $(objpfx)plural.c + ifeq ($(run-built-tests),yes) + ifeq (yes,$(build-shared)) + ifneq ($(strip $(MSGFMT)),:) ++tests += tst-gettext-path-traversal + tests-special += $(objpfx)tst-translit.out $(objpfx)tst-gettext.out \ + $(objpfx)tst-gettext2.out $(objpfx)tst-codeset.out \ + $(objpfx)tst-gettext3.out +@@ -107,6 +108,7 @@ $(objpfx)tst-gettext6.out: tst-gettext6.sh $(objpfx)tst-gettext6 + $(objpfx)tst-codeset.out: $(codeset_mo) + $(objpfx)tst-gettext3.out: $(codeset_mo) + $(objpfx)tst-gettext5.out: $(codeset_mo) ++$(objpfx)tst-gettext-path-traversal.out: $(codeset_mo) + endif + + LOCALES := de_DE.ISO-8859-1 de_DE.UTF-8 en_US.ANSI_X3.4-1968 fr_FR.ISO-8859-1 \ +@@ -121,6 +123,7 @@ $(objpfx)tst-gettext4.out: $(gen-locales) + $(objpfx)tst-gettext5.out: $(gen-locales) + $(objpfx)tst-gettext6.out: $(gen-locales) + $(objpfx)tst-gettext-c-utf8.out: $(gen-locales) ++$(objpfx)tst-gettext-path-traversal.out: $(gen-locales) + $(objpfx)tst-translit.out: $(gen-locales) + endif + +@@ -140,6 +143,7 @@ CFLAGS-tst-gettext3.c += -DOBJPFX=\"$(objpfx)\" + CFLAGS-tst-gettext4.c += -DOBJPFX=\"$(objpfx)\" + CFLAGS-tst-gettext5.c += -DOBJPFX=\"$(objpfx)\" + CFLAGS-tst-gettext6.c += -DOBJPFX=\"$(objpfx)\" ++CFLAGS-tst-gettext-path-traversal.c += -DOBJPFX=\"$(objpfx)\" + + ifeq ($(have-thread-library),yes) + ifeq (yes,$(build-shared)) +diff --git a/intl/dcigettext.c b/intl/dcigettext.c +index a028518c2a..57f422f437 100644 +--- a/intl/dcigettext.c ++++ b/intl/dcigettext.c +@@ -684,10 +684,10 @@ DCIGETTEXT (const char *domainname, const char *msgid1, const char *msgid2, + *cp++ = *categoryvalue++; + *cp = '\0'; + +- /* When this is a SUID binary we must not allow accessing files +- outside the dedicated directories. */ +- if (ENABLE_SECURE && IS_PATH_WITH_DIR (single_locale)) +- /* Ingore this entry. */ ++ /* Do not allow accessing files outside the dedicated ++ directories. */ ++ if (IS_PATH_WITH_DIR (single_locale) ++ || strcmp (single_locale, "..") == 0) + continue; + } + +diff --git a/intl/tst-gettext-path-traversal.c b/intl/tst-gettext-path-traversal.c +new file mode 100644 +index 0000000000..95ad326f64 +--- /dev/null ++++ b/intl/tst-gettext-path-traversal.c +@@ -0,0 +1,83 @@ ++/* Test that LANGUAGE values with path traversal are rejected [BZ #17142]. ++ Copyright (C) 2026 Free Software Foundation, Inc. ++ This file is part of the GNU C Library. ++ ++ The GNU C Library is free software; you can redistribute it and/or ++ modify it under the terms of the GNU Lesser General Public ++ License as published by the Free Software Foundation; either ++ version 2.1 of the License, or (at your option) any later version. ++ ++ The GNU C Library is distributed in the hope that it will be useful, ++ but WITHOUT ANY WARRANTY; without even the implied warranty of ++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ++ Lesser General Public License for more details. ++ ++ You should have received a copy of the GNU Lesser General Public ++ License along with the GNU C Library; if not, see ++ . */ ++ ++#include ++#include ++#include ++#include ++#include ++ ++static const char *const domaindir = OBJPFX "domaindir"; ++static const char *const localedir = OBJPFX "domaindir/de_DE"; ++static const char *const msgdir = OBJPFX "domaindir/de_DE/LC_MESSAGES"; ++ ++static int ++do_test (void) ++{ ++ unsetenv ("OUTPUT_CHARSET"); ++ /* LANGUAGE is only consulted if the locale is not "C" or "C.". ++ The catalog is in ISO-8859-1, as is the locale, so no conversion of ++ the translation takes place. */ ++ xsetlocale (LC_ALL, "de_DE.ISO-8859-1"); ++ textdomain ("codeset"); ++ ++ /* Verify that a legitimate LANGUAGE value produces the expected ++ translation. This exercises the normal lookup path and confirms ++ that the test .mo catalog is in place. */ ++ bindtextdomain ("codeset", domaindir); ++ setenv ("LANGUAGE", "de_DE", 1); ++ TEST_COMPARE_STRING (gettext ("cheese"), "K\344se"); ++ ++ /* A bare ".." must be rejected. Without the fix this would resolve ++ to msgdir/../LC_MESSAGES/codeset.mo, which is the real catalog, ++ so the translation would succeed. */ ++ bindtextdomain ("codeset", msgdir); ++ setenv ("LANGUAGE", "..", 1); ++ TEST_COMPARE_STRING (gettext ("cheese"), "cheese"); ++ ++ /* A relative path that leaves and re-enters the catalog directory ++ must be rejected. Without the fix this would resolve to ++ localedir/../de_DE/LC_MESSAGES/codeset.mo. */ ++ bindtextdomain ("codeset", localedir); ++ setenv ("LANGUAGE", "../de_DE", 1); ++ TEST_COMPARE_STRING (gettext ("cheese"), "cheese"); ++ ++ /* Multiple levels of directory traversal must be rejected. Without ++ the fix this would resolve to ++ msgdir/../../de_DE/LC_MESSAGES/codeset.mo. */ ++ bindtextdomain ("codeset", msgdir); ++ setenv ("LANGUAGE", "../../de_DE", 1); ++ TEST_COMPARE_STRING (gettext ("cheese"), "cheese"); ++ ++ /* Invalid entries in a colon-separated LANGUAGE list must be ++ skipped individually; valid entries that follow are still ++ used. */ ++ bindtextdomain ("codeset", domaindir); ++ setenv ("LANGUAGE", "..:../de_DE:de_DE", 1); ++ TEST_COMPARE_STRING (gettext ("cheese"), "K\344se"); ++ ++ /* A path containing "/.." must be rejected. Use localedir so the ++ binding changes, which invalidates the DCIGETTEXT result cache. */ ++ bindtextdomain ("codeset", localedir); ++ setenv ("LANGUAGE", "LC_MESSAGES/..", 1); ++ TEST_COMPARE_STRING (gettext ("cheese"), "cheese"); ++ ++ return 0; ++} ++ ++#include diff --git a/meta/recipes-core/glibc/glibc_2.39.bb b/meta/recipes-core/glibc/glibc_2.39.bb index d31c865641..805a78571c 100644 --- a/meta/recipes-core/glibc/glibc_2.39.bb +++ b/meta/recipes-core/glibc/glibc_2.39.bb @@ -63,6 +63,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \ file://0028-CVE-2026-6238-0004.patch \ file://0029-CVE-2026-6238-0005.patch \ file://0030-CVE-2026-6238-0006.patch \ + file://CVE-2026-84243.patch \ " S = "${WORKDIR}/git" B = "${WORKDIR}/build-${TARGET_SYS}"