util-linux: Update to version 2.42.3

- Update from version 2.42 to 2.42.3
- No change in any rootfiles
- 5 CVE fixes in 2.42.3
- Changelog
2.42.3
Security fixes:
 CVE-2026-53613 - mount(8) TOCTOU race on target path.
   The SUID mount does not pin the mount target directory, allowing a
   race between path resolution and the actual mount syscall.  A local
   attacker can swap an ancestor directory component between these
   steps to redirect a mount to an arbitrary location.
   Reported-by: Xinyao Hu
 CVE-2026-53612 - mount(8) TOCTOU race on post-mount owner/mode change.
   The X-mount.owner, X-mount.group, and X-mount.mode options use
   path-based lchown()/chmod() after mounting.  An attacker can swap
   the target between mount and the ownership/mode change to gain
   control of arbitrary files.
   Reported-by: Xinyao Hu
 CVE-2026-53614 - mount(8) SUID bypass via LIBMOUNT_FORCE_MOUNT2.
   The environment variable LIBMOUNT_FORCE_MOUNT2 is not filtered
   via safe_getenv() in SUID context.  A local attacker can force
   the legacy mount(2) code path, which uses a two-step bind+remount
   or propagation sequence with a window where security flags (nosuid,
   noexec, ...) are not yet applied.
   Reported-by: Xinyao Hu
 CVE-2026-27456 - mount(8) TOCTOU symlink attack via loop device (follow-up).
   The v2.42.1 fix used O_NOFOLLOW which only rejects symlinks at the
   last path component.  This update uses openat2(RESOLVE_NO_SYMLINKS)
   to reject symlinks at any component of the backing file path.
 CVE-2026-13595 - libblkid: use-after-free in nested partition probing.
   The partitions list stores partitions in a contiguous array grown by
   reallocarray().  When the array is reallocated, all existing
   blkid_partition pointers become dangling.
   Reported-by: Thai Duong
Backward incompatible changes:
 The security fixes above harden the SUID mount(8) against TOCTOU
 attacks.  As a side effect, the following features are restricted
 for non-root users:
 X-mount.subdir=
   Restricted to Linux >= 6.15 for non-root users.  The old-kernel
   implementation uses namespace unsharing and string-based
   move_mount() which is unsafe (TOCTOU).  The safe detached subdir
   open is available only on Linux >= 6.15.
 X-mount.nocanonicalize
   Ignored for non-root users.  Paths must always be canonicalized
   in restricted mode to ensure safe target resolution before
   fd pinning.
 LIBMOUNT_FORCE_MOUNT2=
   Ignored in SUID context (filtered via safe_getenv()).
   Additionally, multi-step mount(2) sequences (bind+remount and
   propagation changes) are refused for non-root users in the
   legacy mount path because the two-step approach has a window
   where security flags (nosuid, noexec, ...) are not yet applied.
   The new mount API (fsopen/fsconfig/fsmount) handles this
   atomically and is not affected.
Changes:
 asciidoctor:
    - fix encoding error for non-ASCII translations (by Karel Zak)
 docs:
    - setpriv improve EXAMPLES section (by Karel Zak)
 fdisk-list:
    - fix memory leak when partition returns empty string (by Leefancy)
    - fix memory leak in partition listing (by Leefancy)
 fsck.minix:
    - bound namelen guessed in get_dirsize (by aizu-m)
 hexdump:
    - fix buffer overflow in color_cond() (by Karel Zak)
 include/mountutils.h:
    - fix LSMT_ROOT definition (by Shubham Chakraborty)
 lib:
    - (pidutils.c) allow zero and negative numbers for PIDs (by Christian Goeschel Ndjomouo)
 libblkid:
    - fix use-after-free in nested partition probing (by Karel Zak)
 libfdisk:
    - fix use of on-disk sizeof_partition_entry in GPT (by Karel Zak)
 lib/fileutils:
    - add ul_open_no_symlinks() (by Karel Zak)
 libmount:
    - add mount ID verification and man page TOCTOU note (by Karel Zak)
    - use fd_target in hook_idmap for move_mount() (by Karel Zak)
    - restrict X-mount.subdir for non-root to Linux >= 6.15 (by Karel Zak)
    - use fd-based fchownat/chmod in hook_owner (by Karel Zak)
    - ignore X-mount.nocanonicalize for restricted users (by Karel Zak)
    - add fd_target to context for TOCTOU prevention (by Karel Zak)
    - fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy mount path (by Karel Zak)
    - detect fanotify queue overflow in monitor (by Karel Zak)
    - fix subvolid buffer overflow in get_btrfs_fs_root (by aizu-m)
 loopdev:
    - use openat2(RESOLVE_NO_SYMLINKS) for backing file (by Karel Zak)
 lscpu:
    - free cputype ISA string (by Zephyr Li)
 lslogins:
    - bound lastlog2 tty/host copy to destination size (by aizu-m)
 nsenter:
    - Fix invalid fd check in enter_namespaces (by Vladimir Riabchun)
 pam_lastlog2:
    - fix libpam linking in autotools build (by Karel Zak)
 readprofile:
    - replace popen() with fork/exec for .gz map files (by Karel Zak)
 tests:
    - (hexdump) use arrays for OPTS and ADDRFMT (by Karel Zak)
    - mkswap file-existing subtest add explicit page size (by Karel Zak)
2.42.1
 getty:
    - Always call chdir after chroot (by Tobias Stoeckmann)
 autotools:
    - Fix setpriv build with econf (by Tobias Stoeckmann)
 bits:
    - use getline() to avoid stdin input truncation (by WanBingjiang)
    - prevent unsigned integer underflow and long-lived loop (by Christian Goeschel Ndjomouo)
 build:
    - (copyfilerange) include syscall header check for fallback (by Christian Goeschel Ndjomouo)
    - Fix --disable-copyfilerange (by Tobias Stoeckmann)
 build-sys:
    - drop libcommon_shells from binaries that only need ul_default_shell (by Karel Zak)
 cfdisk:
    - fix memory leak of original_layout table (by Karel Zak)
 chrt:
    - Fix confusing error messages when priority argument is required (by Rong Zhang)
    - Only show current scheduling policy when pid is given (by Rong Zhang)
    - pass correct integer types to printf (by Thomas Weißschuh)
    - (man) explain which kernel config options are needed for SCHED_EXT (by Christian Goeschel Ndjomouo)
 ci:
    - use GCC 15 (by Thomas Weißschuh)
    - run 'make checkusage' only for autotools build (by Thomas Weißschuh)
 CI:
    - replace ntp with ntpsec (by Karel Zak)
 column:
    - fix missing out-of-bounds check in table reordering (by Christian Goeschel Ndjomouo)
 copyfilerange:
    - (man) fix swapped offsets in command example (by Štěpán Němec)
 dmesg:
    - fix out-of-bounds read when parsing malformed kmsg file (by WanBingjiang)
 docs:
    - clarify wipefs --force description for partition-table signatures (by AndyLau-SOC)
 eject:
    - tolerate ILLEGAL REQUEST on ALLOW_MEDIUM_REMOVAL (by Alessandro Ratti)
 fallocate:
    - (man) mention supported file systems for --insert-range (by Christian Goeschel Ndjomouo)
 fdisk:
    - fix trailing whitespace in user reply from readline completion (by Leonid Znamenok)
 fincore:
    - (tests) fix tmpfs detection for out-of-tree builds (by Leonid Znamenok)
 flock:
    - re-enable the initial shell selection logic (by Christian Goeschel Ndjomouo)
 fsck.minix(man):
    - Fix asciidoctor table (by Tobias Stoeckmann)
 hardlink:
    - avoid format string error for dev_t (by Thomas Weißschuh)
 include:
    - (fileutils.h) add fallback for the copy_file_range syscall (by Christian Goeschel Ndjomouo)
 ipcutils:
    - use memset explicitly to fill bpf_attr with zero (by Masatake YAMATO)
 irqtop:
    - add vw_printw() fallback for slang builds (by Karel Zak)
 irqtop/lsirq:
    - Handle EOF in get_irqinfo (by Tobias Stoeckmann)
 last:
    - fix phantom detection for unset loginuid and X11 sessions (by Karel Zak)
 lib:
    - split ul_default_shell() from shells.c into default_shell.c (by Karel Zak)
    - (cpuset.c) dont calculate allocation size for 0 ncpus (by Christian Goeschel Ndjomouo)
 libblkid:
    - Fix typo in probe_zfs (by Tobias Stoeckmann)
    - Fix type access in zfs_extract_guid_name (by Tobias Stoeckmann)
    - Fix debug OOB read in zfs_process_value (by Tobias Stoeckmann)
    - Fix parse_dev debug output (by Tobias Stoeckmann)
    - Ignore secondary LUKS2 header in blkid_do_safeprobe() (by silentcreek)
    - reiserfs add block size validation for reiser4 (by Karel Zak)
    - erofs validate blkszbits before checksum calculation (by Karel Zak)
    - exfs avoid 32-bit overflow in rextsize validation (by Karel Zak)
    - solaris use 64-bit for partition offset calculations (by Karel Zak)
    - bsd use 64-bit for partition offset calculations (by Karel Zak)
    - mac use 64-bit for partition offset calculations (by Karel Zak)
    - dos use 64-bit for partition offset calculations (by Karel Zak)
    - udf avoid 32-bit overflow in offset calculations (by Karel Zak)
    - vfat avoid 32-bit overflow in offset calculations (by Karel Zak)
    - ubi fix probe return values (by Karel Zak)
    - f2fs tighten log_blocksize validation (by Karel Zak)
    - nilfs fix byte order and block size validation (by Karel Zak)
    - gpt fix wiper offset to use sector size (by Karel Zak)
    - udf cap descriptor sequence iteration count (by Karel Zak)
    - bcache add missing NULL check (by Karel Zak)
    - bsd read enough data to cover disklabel struct (by Karel Zak)
    - befs improve bounds checking in B+ tree search (by Karel Zak)
    - ntfs improve integer overflow checks (by Karel Zak)
    - introduce sysfs_devno_is_dm_hidden() for pre-open check (by Zdenek Kabelac)
 libcommon:
    - move pidfd-utils.c to Linux-only sources (by Karel Zak)
 liblastlog2:
    - (tests) avoid log spam (by Thomas Weißschuh)
    - wait on busy SQLite connections (by WanBingjiang)
 libmount:
    - return btrfs rootfs from get_btrfs_fs_root() (by Karel Zak)
    - use match_source for mountinfo comparison (by Karel Zak)
 lib/pidutils, lib/pidfd-utils:
    - use _() instead of N_() in err() calls (by Karel Zak)
 lib/pwdutils:
    - fix compiler warning [-Werror=maybe-uninitialized] (by Karel Zak)
 libsmartcols:
    - drop superfluous call yo yylex_init() (by Thomas Weißschuh)
    - (tests) fix failure reporting in filter test (by Thomas Weißschuh)
    - (tests) fix filter test name (by Thomas Weißschuh)
    - Ignore -Wsign-compare in filter-scanner.l (by Thomas Weißschuh)
 libuser:
    - fix misleading error message (by Christian Goeschel Ndjomouo)
 login:
    - Clean up PAM resources on error path (by Tobias Stoeckmann)
 login-utils/auth:
    - Drop pam_setcred (by Tobias Stoeckmann)
 lsblk(man):
    - Add COLORS section (by Tobias Stoeckmann)
 lsclocks:
    - add missing newline character in option description (by Christian Goeschel Ndjomouo)
 lscpu(man):
    - Move options into correct section (by Tobias Stoeckmann)
 lsfd:
    - use memset explicitly to fill bpf_attr with zero (by Masatake YAMATO)
 meson:
    - check slang headers only when slang library is found (by Karel Zak)
    - rename logindefs_c to lib_common_logindefs (by Karel Zak)
    - split shells.c out of lib_common into lib_common_shells (by Karel Zak)
    - respect build-dmesg for test_dmesg (by Thomas Weißschuh)
    - test for statx::stx_mnt_id in sys/stat.h (by Thomas Weißschuh)
 mkfs.cramfs:
    - Consider -i only once (by Tobias Stoeckmann)
    - Add -p padding only once (by Tobias Stoeckmann)
    - Improve file size check (by Tobias Stoeckmann)
 mkswap:
    - Fix --file chmod(2) check when file exists (by Johannes Wüller)
 more:
    - align MORE_SHELL_LINES semantics with less(1) (by Karel Zak, Christian Goeschel Ndjomouo)
 newgrp:
    - Correctly handle getline error (by Tobias Stoeckmann)
 nsenter:
    - Fix AT_HANDLE_FID on musl (by Aleksi Hannula)
 pidfd-utils:
    - Fix pidfd_get_inode declaration (by Tobias Stoeckmann)
 po:
    - merge changes (by Karel Zak)
    - update ro.po (from translationproject.org) (by Remus-Gabriel Chelu)
    - update pt.po (from translationproject.org) (by Pedro Albuquerque)
    - update pl.po (from translationproject.org) (by Jakub Bogusz)
    - update ja.po (from translationproject.org) (by YOSHIDA Hideki)
    - update et.po (from translationproject.org) (by Toomas Soome)
    - update cs.po (from translationproject.org) (by Petr Písař)
 po-man:
    - merge changes (by Karel Zak)
    - update ro.po (from translationproject.org) (by Remus-Gabriel Chelu)
 po-man/po4a:
    - Add missing manual pages (by Tobias Stoeckmann)
 readprofile:
    - (man) clarify not designed for privilege-elevation use (by Karel Zak)
 script:
    - fix "--" separator when used as option argument (by Karel Zak)
    - fix command and command_norm memory leaks (by Karel Zak)
    - fix backward compatibility for options after non-option args (by Karel Zak)
 scriptreplay(man):
    - Add right arrow documentation (by koraynilay)
 strutils:
    - fix printf formats (by Thomas Weißschuh)
 su:
    - Clean up PAM resources on all error paths (by Tobias Stoeckmann)
    - fix grammar on man page (by Christian Goeschel Ndjomouo)
 su-common:
    - revert "su pass arguments after <user> to shell" (by Christian Goeschel Ndjomouo)
 terminal-colors.d:
    - (man) re-apply improvements lost in merge (by Benno Schulenberg)
 tests:
    - (lsfd/mkfds-udp*) make UDPLite related test cases skippable (by Masatake YAMATO)
    - (lsfd/option-inet{,-udp}) make UDPLite related test case skippable (by Masatake YAMATO)
    - (lsfd) add a function checking the availability of UDPLite socket (by Masatake YAMATO)
    - (lsfd::mkfds-udp) fix confusion between UDP and UDPLite (by Masatake YAMATO)
    - (test_mkfds) use memset explicitly to fill bpf_attr with zero (by Masatake YAMATO)
    - (ipcs/limits) skip when /proc/sys/kernel is read-only (by Karel Zak)
    - (bits) add --width tests for invalid values (by Christian Goeschel Ndjomouo)
    - add btrfs RAID is-mounted test for libmount (by Karel Zak)
 tests/functions.sh:
    - consider '+' for metadata in kernel version parsing (by Christian Goeschel Ndjomouo)
 tools:
    - (compare-buildsys) suppress common lines in diff output (by Karel Zak)
 tools/git-tp-sync:
    - update po4a.cfg language list on sync (by Karel Zak)
 write:
    - cleanup indentation and whitespace (by Karel Zak)
    - use mem2strcpy() for utmp strings (by Karel Zak)
    - always use utmp as fallback (by Karel Zak)
 write, mesg:
    - add S_ISCHR() check for terminal device paths (by Karel Zak)
 Misc:
    - Remove obsolete comment since 2015 (by Julien Nabet)
    - Link against libcommon_logindefs.la and libcommon_shells.la (by Stanislav Brabec)
    - Fix build with libeconf (by Stanislav Brabec)
    - [po-man] Add missing languages to po4a.cfg (by Mario Blättermann)

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
---
 lfs/util-linux | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)