From nobody Wed Apr 29 18:41:15 2026 X-Original-To: freebsd-security@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4g5R2z5bwKz6Zv9M for ; Wed, 29 Apr 2026 18:41:15 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2610:1c1:1:6074::16:84]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "freefall.freebsd.org", Issuer "R13" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4g5R2z3SK8z48lJ; Wed, 29 Apr 2026 18:41:15 +0000 (UTC) (envelope-from security-advisories@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1777488075; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=12hx3gdyvyd4jDmZfazu7fjld61j0sJcmSvqqFiAhgY=; b=aJ8qnX51PmAqd8tUKGmDhNqJQVSLnJWr+uFF6oDoaPgVL4vcJK2nMSSCLV4AcErw5T9out FJTpb33Nq/30UM2OIoVonVu7Xuu+L3H8Sr2ngtDYFKZBtIe4clohXo0nsb1MO4foQ+XMuO bpApVd1g4HC0yCyvUs2MME7Zzx5VT/3CtjCjYiQplAZz168ylf9W14BTxf4vCgWMVlGGCT 0G44nijz3XSjfbsBsfzY1eopx3Dnb20485Pzh72jCS+9K9HXj5YmlAn4TptnIWvnY7VlBY JeHP9FNNYOYcTCFQD8+WuPoLhMh/1vCHm7Q81rQhfMtHg0AA+YMpDM1gxt0m1A== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1777488075; a=rsa-sha256; cv=none; b=Ms8RzC2kCmWZJ8h1AIzlIRGQLcQVKzPyE5FQiOZLy2/TvE1Y+U4aWAnFxMF1+uipgfQJRj lwGJyioY9fi7KB0HKTAsc+SIoK8RLrFxEMzFq1l9CMz4+ykIQnmGBsZZ0uWRFGBCNUn1qm DEEE6W7i6PfR2tOEvlsL7UIRi8GcM4WR8JfX+LU5HJRp+iEeK4zR3oyrGnWNVqDJbdGxxJ DAFqY+GelSUKwkdpkG+VlfGx8MbSqvOma+zreb/j8cDqCIB0GZhUITP9Ss3nDblZqusJyd SVMtG5fBKWxFxEA9D49P2ZYBCjj3ZeYcluuCxrxi+NKF1rTtqyDiCxViNBRB8w== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1777488075; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=12hx3gdyvyd4jDmZfazu7fjld61j0sJcmSvqqFiAhgY=; b=q4jy/IMZR0SVBpf+nWvIddWSPyF1zbnPQQI+UFXdxTa/ThBuLJTuSwgu0Nurk5xfSXn4qS s/UeLm1ULxjKvs6tWM8nmc5C7dk4NBMOZ6KX/efKE5v5Iw1a1szk3fwNLtT+mqa1YRC9et BZKfdAXEvCPmIW1eOQyR+m4Ie3RM0C5mEkIwqB4b4wK/l8P0Mb0pkcrkN745cyPhUMtC2Z v3ZnP1Txkjwynfbp6R5iYTAwYUTHMY6hB8KoOpZL9n8nRQk9WgyCkm6wsUHmlq/gsBQUo5 3x9YI3Zp/2hDzlK0m6ZrtLRWNnGd1Wv7HaLmqRSepSBzBKPcLwC9xtqv/Dmvpw== Received: by freefall.freebsd.org (Postfix, from userid 945) id 60B1E9765; Wed, 29 Apr 2026 18:41:15 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-26:17.libnv Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20260429184115.60B1E9765@freefall.freebsd.org> Date: Wed, 29 Apr 2026 18:41:15 +0000 (UTC) List-Id: Security issues List-Archive: https://lists.freebsd.org/archives/freebsd-security List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-security@freebsd.org Sender: owner-freebsd-security@FreeBSD.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:17.libnv Security Advisory The FreeBSD Project Topic: Heap overflow in libnv Category: core Module: libnv Announced: 2026-04-29 Credits: Mariusz Zaborski Affects: All supported versions of FreeBSD. Corrected: 2026-04-29 14:47:52 UTC (stable/15, 15.0-STABLE) 2026-04-29 14:48:33 UTC (releng/15.0, 15.0-RELEASE-p7) 2026-04-29 14:48:57 UTC (stable/14, 14.4-STABLE) 2026-04-29 14:49:48 UTC (releng/14.4, 14.4-RELEASE-p3) 2026-04-29 14:49:28 UTC (releng/14.3, 14.3-RELEASE-p12) 2026-04-29 14:50:10 UTC (stable/13, 13.5-STABLE) 2026-04-29 14:50:22 UTC (releng/13.5, 13.5-RELEASE-p13) CVE Name: CVE-2026-35547 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background libnv is a general-purpose library designed for storing and exchanging sets of name-value pairs. This library can serve as an Inter-Process Communication (IPC) framework, enabling processes to exchange data and file descriptors. For example, it is used in libcasper to establish communication between privileged and unprivileged processes. Additionally, libnv can function as an interface for communication between userland and kernel. Originally, libnv was inspired by OpenZFS' nvlist implementation. However, the implementations are separate. This advisory relates only to the base system implementation of libnv, not the one in OpenZFS. II. Problem Description When processing the header of an incoming message, libnv failed to properly validate the message size. III. Impact The lack of validation allows a malicious program to write outside the bounds of a heap allocation. This can trigger a crash or system panic, and it may be possible for an unprivileged user to exploit the bug to elevate their 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. 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-26:17/libnv.patch # fetch https://security.FreeBSD.org/patches/SA-26:17/libnv.patch.asc # gpg --verify libnv.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/ 414e25d7d512 stable/15-n283381 releng/15.0/ b345e07c8d71 releng/15.0-n281033 stable/14/ 1cbd6e148249 stable/14-n274082 releng/14.4/ 4f0992ce23b0 releng/14.4-n273697 releng/14.3/ aa15809f85de releng/14.3-n271497 stable/13/ 05b91c2a7106 stable/13-n259863 releng/13.5/ f7f48005fbe2 releng/13.5-n259219 - ------------------------------------------------------------------------- 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----- iQJPBAEBCgA5FiEEthUnfoEIffdcgYM7bljekB8AGu8FAmnySTgbFIAAAAAABAAO bWFudTIsMi41KzEuMTIsMCwzAAoJEG5Y3pAfABrvV+cQANyoTjQKCgT/ObIaHIvn /ZHiHhWtxqpnOGHiJQ/Pu32XfF4zngUmxH3RFM4V+p2QTKd+OnCojcr/nWjS1Xh4 D2G0TUYeTfEUzERLxODtWSxD6Px0n7qutRgpTx9yLid3N34av93aoQYnK+1FkqAf PonQlVKqI2Ab44879/Aw4glrjNQg2kGzAwSA4Nzik96BZMePQk6sDnzNKODz914O khZ6KDSc9Fc0jUS4RZUh1AXnAEV2a7vD3fQLg+8aegFiaIajnC4dFZPjl1jioawp 0Jm0f1UI/n5jfp/zyHCJZIgDNvcX+laFnLRJuB8XCrWk8luFdpVOTUjsuPMSA737 TwdSG05ZnGhWsJhQjK0mdkDxoH81wWW7mz21jjVBJ9UhaWhGMNV4mBSevfFYkFkb JHuHO0aCUB6e6/MJ/7O6d0tG9etdQUjCpQeLqXKiYQKqjQkplUUL0C2Uy7A4otEu MelMjHsQMQEjUpRVxX4IADyNQgtJjrroFDdoez3oBF1dfBxQrKkWBnKTTYrV6cbl fIVmkl2b6B/0FcGhAekDh1tLvHj4Ul0n8wzb19F7vT1+4QlnLOtIrXZcJdsTbqde tKRoUYcwvBpUn2bsefxWzEPZ9jvSBoIkSwPmSnu8zQ1jY44eyiHodaXkMsZygplL WfRkGmyutQ0XdUuhcCSyfi/G =K9xn -----END PGP SIGNATURE-----