-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:13.exec Security Advisory The FreeBSD Project Topic: Local privilege escalation via execve() Category: core Module: execve(2) Announced: 2026-04-29 Credits: Ryan Austin of Calif.io Affects: All supported versions of FreeBSD. Corrected: 2026-04-29 14:47:46 UTC (stable/15, 15.0-STABLE) 2026-04-29 14:48:27 UTC (releng/15.0, 15.0-RELEASE-p7) 2026-04-29 14:48:49 UTC (stable/14, 14.4-STABLE) 2026-04-29 14:49:40 UTC (releng/14.4, 14.4-RELEASE-p3) 2026-04-29 14:49:21 UTC (releng/14.3, 14.3-RELEASE-p12) 2026-04-29 14:50:05 UTC (stable/13, 13.5-STABLE) 2026-04-29 14:50:17 UTC (releng/13.5, 13.5-RELEASE-p13) CVE Name: CVE-2026-7270 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background execve(2) is a system call is used to launch an executable image, including scripts prefixed with a path to the interpreter. The system call takes a path to the image as a parameter, followed by extra arguments and environment variables to be passed to the new image. II. Problem Description An operator precedence bug in the kernel results in a scenario where a buffer overflow causes attacker-controlled data to overwrite adjacent execve(2) argument buffers. III. Impact The bug may be exploitable by an unprivileged user to obtain superuser privileges. IV. Workaround No workaround is available. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot the system. Perform one of the following: 1) To update your vulnerable system installed from base system packages: Systems running a 15.0-RELEASE version of FreeBSD on the amd64 or arm64 platforms, which were installed using base system packages, can be updated via the pkg(8) utility: # pkg upgrade -r FreeBSD-base # shutdown -r +10min "Rebooting for a security update" 2) To update your vulnerable system installed from binary distribution sets: Systems running a RELEASE version of FreeBSD on the amd64 or arm64 platforms, or the i386 platform on FreeBSD 13, which were not installed using base system packages, can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install # shutdown -r +10min "Rebooting for a security update" 3) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/SA-26:13/exec.patch # fetch https://security.FreeBSD.org/patches/SA-26:13/exec.patch.asc # gpg --verify exec.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in and reboot the system. VI. Correction details This issue is corrected as of the corresponding Git commit hash in the following stable and release branches: Branch/path Hash Revision - ------------------------------------------------------------------------- stable/15/ c3e943e78e06 stable/15-n283376 releng/15.0/ 934b48683c4f releng/15.0-n281028 stable/14/ ae00a52921ca stable/14-n274075 releng/14.4/ 943aa64ba91a releng/14.4-n273690 releng/14.3/ f04c40607b8f releng/14.3-n271491 stable/13/ d619e3a3c0ec stable/13-n259858 releng/13.5/ 7c5c37ac8f8f releng/13.5-n259214 - ------------------------------------------------------------------------- Run the following command to see which files were modified by a particular commit: # git show --stat Or visit the following URL, replacing NNNNNN with the hash: To determine the commit count in a working tree (for comparison against nNNNNNN in the table above), run: # git rev-list --count --first-parent HEAD VII. References The latest revision of this advisory is available at -----BEGIN PGP SIGNATURE----- iQJPBAEBCgA5FiEEthUnfoEIffdcgYM7bljekB8AGu8FAmnySSobFIAAAAAABAAO bWFudTIsMi41KzEuMTIsMCwzAAoJEG5Y3pAfABrvjo8QANkZEWuyL/5O51TNbvUj SSwE2BN/mjpiLVM7bfvsb7/Ow0vnKiQ3o9ABLbk/YHVOPEzWTzzPJ1XY6Jfnje4h embXMN9hA/DT0QnnoB8HYzckZ4WpV1Ok+yfR25C/Gjbfje9Qb+dbhoS9aXEDrVA9 5o8OmrsC+cngG053KeCMG5Ja+IEN6ZKleO327J+j7DON84K8QDl8KKT/hEcy5Mx2 M6aho8YDo/wroc4nSJ6dZYpG7hfKEQRNTRbYrj21VAg2zXz8gOB2bQgiIr9Bb0ha Kzj/iRapiZDOVu76jpi0clstqDiKEmI3/kf0HNF8B4xWSJ9XL6zfV5EkWCAOzhg6 Y12Z2RyoWp6Vc35utL7zEuSDvMitEQx4QlhTQRqXoKLgRCnz9OZ8eGhYGiKLrc+Z FZ3j/l2RM5SXwh70xN1b455t2HBNm/ZDkpjTYhQPgYDq2A8z1K0d63rh6tAhNGjK NHZ7hFaf1kKAmO/p8AyoQJ0bl36u31JXOVgJ7U2UEm3bdvHF0SQ8Xe61oiHSMifO dP6Sv//VPEWLqq/oGIplkxJMZ9VAWdiap7/+1lWI72DvFkpb+GdXIPs4fAbIYVwI MbdcJygSDwjB8fJh4+sdylWAVQJQFkjUeAvn3huCuoEzlAtaE9Urdh0JnibLAYKN v/drFvMv5zppIn1Ry/knM4vG =YAct -----END PGP SIGNATURE-----