From: Peter Marko <[email protected]> Pick patch [1] which is [2] backported to 3.41 (oldest release still receiving security updates) which is mentioned in [3].
[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=1a74f82eedaf0987eda1f522121e6a48fac502e7 [2] https://sourceware.org/git/?p=glibc.git;a=commit;h=839898777226a3ed88c0859f25ffe712519b4ead [3] https://security-tracker.debian.org/tracker/CVE-2026-5450 Signed-off-by: Peter Marko <[email protected]> --- .../glibc/glibc/0032-CVE-2026-5450.patch | 133 ++++++++++++++++++ meta/recipes-core/glibc/glibc_2.39.bb | 1 + 2 files changed, 134 insertions(+) create mode 100644 meta/recipes-core/glibc/glibc/0032-CVE-2026-5450.patch diff --git a/meta/recipes-core/glibc/glibc/0032-CVE-2026-5450.patch b/meta/recipes-core/glibc/glibc/0032-CVE-2026-5450.patch new file mode 100644 index 00000000000..631b63f4654 --- /dev/null +++ b/meta/recipes-core/glibc/glibc/0032-CVE-2026-5450.patch @@ -0,0 +1,133 @@ +From 1a74f82eedaf0987eda1f522121e6a48fac502e7 Mon Sep 17 00:00:00 2001 +From: Rocket Ma <[email protected]> +Date: Fri, 17 Apr 2026 23:48:41 -0700 +Subject: [PATCH] stdio-common: Fix buffer overflow in scanf %mc [BZ #34008] + +* stdio-common/vfscanf-internal.c: When enlarging allocated buffer with +format %mc or %mC, glibc allocates one byte less, leading to +user-controlled one byte overflow. This commit fixes BZ #34008, or +CVE-2026-5450. + +Reviewed-by: Carlos O'Donell <[email protected]> +Signed-off-by: Rocket Ma <[email protected]> +Reviewed-by: H.J. Lu <[email protected]> +(cherry picked from commit 839898777226a3ed88c0859f25ffe712519b4ead) + +CVE: CVE-2026-5450 +Upstream-Status: Backport [https://sourceware.org/git/?p=glibc.git;a=commit;h=1a74f82eedaf0987eda1f522121e6a48fac502e7] +Signed-off-by: Peter Marko <[email protected]> +--- + stdio-common/Makefile | 4 +++ + stdio-common/tst-vfscanf-bz34008.c | 48 ++++++++++++++++++++++++++++++ + stdio-common/vfscanf-internal.c | 7 ++--- + 3 files changed, 55 insertions(+), 4 deletions(-) + create mode 100644 stdio-common/tst-vfscanf-bz34008.c + +diff --git a/stdio-common/Makefile b/stdio-common/Makefile +index ac098dcd8a..72c18e5dc1 100644 +--- a/stdio-common/Makefile ++++ b/stdio-common/Makefile +@@ -266,6 +266,7 @@ tests := \ + tst-vfprintf-width-i18n \ + tst-vfprintf-width-prec \ + tst-vfprintf-width-prec-alloc \ ++ tst-vfscanf-bz34008 \ + tst-wc-printf \ + tstdiomisc \ + tstgetln \ +@@ -401,6 +402,9 @@ tst-printf-bz18872-ENV = MALLOC_TRACE=$(objpfx)tst-printf-bz18872.mtrace \ + tst-vfprintf-width-prec-ENV = \ + MALLOC_TRACE=$(objpfx)tst-vfprintf-width-prec.mtrace \ + LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so ++tst-vfscanf-bz34008-ENV = \ ++ MALLOC_CHECK_=3 \ ++ LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so + tst-printf-bz25691-ENV = \ + MALLOC_TRACE=$(objpfx)tst-printf-bz25691.mtrace \ + LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so +diff --git a/stdio-common/tst-vfscanf-bz34008.c b/stdio-common/tst-vfscanf-bz34008.c +new file mode 100644 +index 0000000000..48371c8a3d +--- /dev/null ++++ b/stdio-common/tst-vfscanf-bz34008.c +@@ -0,0 +1,48 @@ ++/* Regression test for vfscanf %Nmc out-of-bound write (BZ #34008) ++ Copyright (C) 2026 The GNU Toolchain Authors. ++ 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 ++ <https://www.gnu.org/licenses/>. */ ++ ++#include "malloc/mcheck.h" ++#include <stddef.h> ++#include <stdio.h> ++#include <string.h> ++#include <wchar.h> ++#include <stdlib.h> ++#include <malloc.h> ++#include <support/check.h> ++ ++#define WIDTH 0x410 ++#define SCANFSTR "%1040mc" ++static int ++do_test (void) ++{ ++ mcheck_pedantic (NULL); ++ char *input = malloc (WIDTH + 1); ++ TEST_VERIFY (input != NULL); ++ memset (input, 'A', WIDTH); ++ input[WIDTH] = '\0'; ++ ++ char *buf = NULL; ++ TEST_VERIFY (sscanf (input, SCANFSTR, &buf) != -1); ++ TEST_VERIFY (buf != NULL); ++ ++ free (buf); ++ free (input); ++ return 0; ++} ++ ++#include <support/test-driver.c> +diff --git a/stdio-common/vfscanf-internal.c b/stdio-common/vfscanf-internal.c +index 1ba034d961..fabb0ec874 100644 +--- a/stdio-common/vfscanf-internal.c ++++ b/stdio-common/vfscanf-internal.c +@@ -853,8 +853,7 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr, + { + /* Enlarge the buffer. */ + size_t newsize +- = strsize +- + (strsize >= width ? width - 1 : strsize); ++ = strsize + (strsize >= width ? width : strsize); + + str = (char *) realloc (*strptr, newsize); + if (str == NULL) +@@ -925,7 +924,7 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr, + && wstr == (wchar_t *) *strptr + strsize) + { + size_t newsize +- = strsize + (strsize > width ? width - 1 : strsize); ++ = strsize + (strsize >= width ? width : strsize); + /* Enlarge the buffer. */ + wstr = (wchar_t *) realloc (*strptr, + newsize * sizeof (wchar_t)); +@@ -980,7 +979,7 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr, + && wstr == (wchar_t *) *strptr + strsize) + { + size_t newsize +- = strsize + (strsize > width ? width - 1 : strsize); ++ = strsize + (strsize >= width ? width : strsize); + /* Enlarge the buffer. */ + wstr = (wchar_t *) realloc (*strptr, + newsize * sizeof (wchar_t)); diff --git a/meta/recipes-core/glibc/glibc_2.39.bb b/meta/recipes-core/glibc/glibc_2.39.bb index 0a4f7ac3bd6..e62d941fdde 100644 --- a/meta/recipes-core/glibc/glibc_2.39.bb +++ b/meta/recipes-core/glibc/glibc_2.39.bb @@ -64,6 +64,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \ file://0029-CVE-2026-6238-0005.patch \ file://0030-CVE-2026-6238-0006.patch \ file://0031-CVE-2026-5928.patch \ + file://0032-CVE-2026-5450.patch \ " S = "${WORKDIR}/git" B = "${WORKDIR}/build-${TARGET_SYS}"
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