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=============================================================================
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
+Credits: Ryan 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
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