From: Peter Marko <[email protected]> Pick patch referencing this CVE from 2.41.5 release.
Signed-off-by: Peter Marko <[email protected]> --- meta/recipes-core/util-linux/util-linux.inc | 1 + .../util-linux/CVE-2026-53614.patch | 83 +++++++++++++++++++ 2 files changed, 84 insertions(+) create mode 100644 meta/recipes-core/util-linux/util-linux/CVE-2026-53614.patch diff --git a/meta/recipes-core/util-linux/util-linux.inc b/meta/recipes-core/util-linux/util-linux.inc index f651dc2dab4..70acf6dfec3 100644 --- a/meta/recipes-core/util-linux/util-linux.inc +++ b/meta/recipes-core/util-linux/util-linux.inc @@ -49,6 +49,7 @@ SRC_URI = "${KERNELORG_MIRROR}/linux/utils/util-linux/v${MAJOR_VERSION}/util-lin file://CVE-2026-27456.patch \ file://CVE-2026-13595.patch \ file://CVE-2026-3184.patch \ + file://CVE-2026-53614.patch \ " SRC_URI[sha256sum] = "7b6605e48d1a49f43cc4b4cfc59f313d0dd5402fa40b96810bd572e167dfed0f" diff --git a/meta/recipes-core/util-linux/util-linux/CVE-2026-53614.patch b/meta/recipes-core/util-linux/util-linux/CVE-2026-53614.patch new file mode 100644 index 00000000000..f1dd4ae5d74 --- /dev/null +++ b/meta/recipes-core/util-linux/util-linux/CVE-2026-53614.patch @@ -0,0 +1,83 @@ +From cc81bbcec598cb91f0eb8456282f33eed820ed5f Mon Sep 17 00:00:00 2001 +From: Karel Zak <[email protected]> +Date: Tue, 16 Jun 2026 10:58:32 +0200 +Subject: [PATCH] libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and + legacy mount path + +Use safe_getenv() for LIBMOUNT_FORCE_MOUNT2 to ignore the variable +in SUID context, consistent with LIBMOUNT_FSTAB and other sensitive +environment variables. + +Additionally, refuse multi-step mount(2) sequences (bind+remount and +propagation) for restricted (non-root) users in the legacy mount path. +The two-step approach has a window between syscalls where security +flags (nosuid, noexec, ...) are not yet applied. The new mount API +handles this atomically. + +CVE-2026-53614 + +Reported-by: Xinyao Hu <[email protected]> +Signed-off-by: Karel Zak <[email protected]> +(cherry picked from commit 9cbfb823500f510b34767edabd3ffd5b436987b4) + +CVE: CVE-2026-53614 +Upstream-Status: Backport [https://github.com/util-linux/util-linux/commit/cc81bbcec598cb91f0eb8456282f33eed820ed5f] +Signed-off-by: Peter Marko <[email protected]> +--- + libmount/src/hook_mount.c | 3 ++- + libmount/src/hook_mount_legacy.c | 8 ++++++++ + 2 files changed, 10 insertions(+), 1 deletion(-) + +diff --git a/libmount/src/hook_mount.c b/libmount/src/hook_mount.c +index 1ffd19e83..37179fb59 100644 +--- a/libmount/src/hook_mount.c ++++ b/libmount/src/hook_mount.c +@@ -44,6 +44,7 @@ + */ + + #include "mountP.h" ++#include "env.h" + #include "fileutils.h" /* statx() fallback */ + #include "strutils.h" + #include "mount-api-utils.h" +@@ -627,7 +628,7 @@ fail: + + static int force_classic_mount(struct libmnt_context *cxt) + { +- const char *env = getenv("LIBMOUNT_FORCE_MOUNT2"); ++ const char *env = safe_getenv("LIBMOUNT_FORCE_MOUNT2"); + + if (env) { + if (strcmp(env, "always") == 0) +diff --git a/libmount/src/hook_mount_legacy.c b/libmount/src/hook_mount_legacy.c +index 18b7a0066..94a8fc685 100644 +--- a/libmount/src/hook_mount_legacy.c ++++ b/libmount/src/hook_mount_legacy.c +@@ -282,6 +282,8 @@ static int hook_prepare(struct libmnt_context *cxt, + + /* add extra mount(2) calls for each propagation flag */ + if (flags & MS_PROPAGATION) { ++ if (mnt_context_is_restricted(cxt)) ++ goto eperm; + rc = prepare_propagation(cxt, hs); + if (rc) + return rc; +@@ -291,12 +293,18 @@ static int hook_prepare(struct libmnt_context *cxt, + if ((flags & MS_BIND) + && (flags & MNT_BIND_SETTABLE) + && !(flags & MS_REMOUNT)) { ++ if (mnt_context_is_restricted(cxt)) ++ goto eperm; + rc = prepare_bindremount(cxt, hs); + if (rc) + return rc; + } + + return rc; ++eperm: ++ DBG(HOOK, ul_debugobj(hs, ++ "multi-step mount(2) refused for non-root user")); ++ return -EPERM; + } + + const struct libmnt_hookset hookset_mount_legacy =
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