From nobody Tue Apr 21 17:02:21 2026 X-Original-To: freebsd-security-notifications@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 4g0TDY5MFbz6YWqB for ; Tue, 21 Apr 2026 17:02:21 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [96.47.72.132]) (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 4g0TDY3pTlz3wc3; Tue, 21 Apr 2026 17:02:21 +0000 (UTC) (envelope-from security-advisories@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1776790941; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=LSS1CObFUi23kYBIU5BBPmZnSyvzdqW5ySLkd7kgUeE=; b=fXtwOBcoFflplxkBt2bwb/Ns2fdW2GmlRSVDoJR4bmqei4ZRGiK8tJr2ma8JJ2GmIKRngO e2tjDwBTZqt/xetxuHvW/RcFwjTfb8aRQa8h7c8WcQTBXcBtN8fUq+6IFKkICj6Xut5BjU qZkjKCR2syIK2V9U2/1m5/9wEemnJqWy2XHIkRPwZ2A8GMc8T/Nlcw2VSU3VvXbUvkBodq EYDNzYyA4yJth1N/Oo+QfGcKtb8o1fNwA8o1TrvViz5rAYlvY9FrbkN832UnkdWqUovRg7 1l/hYA8wzk+oKX2yphk38T5tXisxD5JbLb76nFwW5V1HM8zqpA8Gf7gzDefizw== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1776790941; a=rsa-sha256; cv=none; b=vBKaAEchMOfj0sYSnoMyT0Ux9djNzwe3z0+H8bPwAQyPBH4Gvtk+r8uRyd2oNASa972PsO 6saNAFwICTHjuA4fsuyQwuVQnTClWjPBvIaxlQh72/nbdlSX81D5jguWosRv1hrZyzi5gi 1nyJ7QeSE3s4M+eIuLjA4KHKHKDjhhviFTIhBU4L0osSqzQ8QICxm90qa54PU5Y9n2scZQ f3D98lIG5+w5bZRDCChKmHtN6bmuoYZu1/mFRZXIVovPHmxcUwISJxHlunuwLPLe1ANwlz gwfqKLY9mtelO5HhOF4BmXCx6rKjx3WLcEcP3OgV3ioTY+95PMMxqG8RJaEzUA== 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=1776790941; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=LSS1CObFUi23kYBIU5BBPmZnSyvzdqW5ySLkd7kgUeE=; b=j3pn38QrAj1k/dtfJvv5PFhM+0G1OQ7rKIyHlRb5D3dIjjvwzUoYKAtM72/W23aSFTVdua j8Aif2MIg7S2WMKl8USZK1FY9BGTx+9M93Sdlr+AriXimkcTAy0GbP4nVVHEvMmc2fHXmH SbjJJ555MtfWLDf+rb7y/BJ+R5L1fTZUKKo6aYiGulsSzkxqAfD0cUPtMjPKHp9Hb3zzdZ FE5EfCTOm83QqQ1nL6CObW+v4zXIE6eCh6LZbtWpiMIgg0jO8mR/+X1MVnGhQ5WNZE9jYV Hcq6s3ncxZANQBSKgwsExYvg/1QLYOXbx3i98su4jnBO4nGVKwZmT9w2/kgJQQ== Received: by freefall.freebsd.org (Postfix, from userid 945) id 7785A1FBE3; Tue, 21 Apr 2026 17:02:21 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-26:10.tty Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20260421170221.7785A1FBE3@freefall.freebsd.org> Date: Tue, 21 Apr 2026 17:02:21 +0000 (UTC) List-Id: Moderated Security Notifications [moderated, low volume] List-Archive: https://lists.freebsd.org/archives/freebsd-security-notifications List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-security-notifications@freebsd.org Sender: owner-freebsd-security-notifications@FreeBSD.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:10.tty Security Advisory The FreeBSD Project Topic: Kernel use-after-free bug in the TIOCNOTTY handler Category: core Module: tty Announced: 2026-04-21 Credits: Nicholas Carlini using Claude, Anthropic Affects: All supported versions of FreeBSD. Corrected: 2026-04-21 15:43:02 UTC (stable/15, 15.0-STABLE) 2026-04-21 15:44:27 UTC (releng/15.0, 15.0-RELEASE-p6) 2026-04-21 15:43:13 UTC (stable/14, 14.4-STABLE) 2026-04-21 15:45:31 UTC (releng/14.4, 14.4-RELEASE-p2) 2026-04-21 15:46:01 UTC (releng/14.3, 14.3-RELEASE-p11) 2026-04-21 15:43:56 UTC (stable/13, 13.5-STABLE) 2026-04-21 15:47:07 UTC (releng/13.5, 13.5-RELEASE-p12) CVE Name: CVE-2026-5398 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background TIOCNOTTY is an ioctl(2) operation which allows a process to detach itself from its controlling terminal. Unprivileged processes may use this ioctl. See the tty(4) manual page for more information on its usage. II. Problem Description The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory. III. Impact A malicious process can abuse the dangling pointer to grant itself root 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. [FreeBSD 15.0] # fetch https://security.FreeBSD.org/patches/SA-26:10/tty-15.patch # fetch https://security.FreeBSD.org/patches/SA-26:10/tty-15.patch.asc # gpg --verify tty-15.patch.asc [FreeBSD 14.4] # fetch https://security.FreeBSD.org/patches/SA-26:10/tty-14.4.patch # fetch https://security.FreeBSD.org/patches/SA-26:10/tty-14.4.patch.asc # gpg --verify tty-14.4.patch.asc [FreeBSD 14.3] # fetch https://security.FreeBSD.org/patches/SA-26:10/tty-14.3.patch # fetch https://security.FreeBSD.org/patches/SA-26:10/tty-14.3.patch.asc # gpg --verify tty-14.3.patch.asc [FreeBSD 13.5] # fetch https://security.FreeBSD.org/patches/SA-26:10/tty-13.patch # fetch https://security.FreeBSD.org/patches/SA-26:10/tty-13.patch.asc # gpg --verify tty-13.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/ 0c6b1e0864b8 stable/15-n283065 releng/15.0/ fdee312d0c97 releng/15.0-n281022 stable/14/ f46210a7ab32 stable/14-n273997 releng/14.4/ af294329c57f releng/14.4-n273685 releng/14.3/ 44077c07f19f releng/14.3-n271485 stable/13/ 5eae7f23fe0e stable/13-n259845 releng/13.5/ 2862a33bdd1c releng/13.5-n259210 - ------------------------------------------------------------------------- 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----- iQIzBAEBCgAdFiEEthUnfoEIffdcgYM7bljekB8AGu8FAmnnoaMACgkQbljekB8A Gu8qzA//fuGHRB8Y+n+EUyAGycr0PGMeG423hykkYBAvfBJJP5RYv4Ter79YAeuu zqXqijjr+yyKcE1+km63/koxUXZmkbpR2Xt/0i2d3jAqnrUioZqwc+llCgqhh6Dr AhyDn+xCtCWJow0Iktlk6ZHEuQLX6kwGxT/1cvmcnhZE8XQf2PNEbRk8oit+kf8c LQZF2EBK4wPh5Lik8DvqoyX1k7B44jVhL2AMqs/2fRdTFluY/MIgvbRsRdCQRLJE doXA2YdDljkTJpAPIg31WP6C7L0LPkeyRm4Xn3zBt4SalyiChfQ9kQYcdQS7/lt4 LUyrQKQHVtVx2SseYFTtPoncYl2IEmaHOAZkQrfzxFybYryoq4macGbuNZh0Aygq mpIAIIDKAyKQCcDGzluRL4ksoPyw9Kav7SJJ83P9khrKINaNg5NZc1Ptc7K/UvSk H5XKwHBaURcXGzl1crBtqbbK5lEvO/UaxXraMwqCTM+WqF7dND2KvSbZEma/FJ8l 7Wcszs2dvgC2dQghlmRlxxYvMGzf49XO4+Y64WarMqmLTAyDV9nBrZGMUj1M2nqC rgylEscbOn8z/Yq8vpr0sydYRVDBHtVMOaztsqFylGnzRfSjQQH3yuJ40ngvy9yo GexBhYXFyrruuuuz9p9xplIRzVkHVjkrm9/zwe4bSBylQ+/MeGQ= =crMa -----END PGP SIGNATURE----- From nobody Tue Apr 21 17:02:26 2026 X-Original-To: freebsd-security-notifications@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 4g0TDg4625z6YX9Z for ; Tue, 21 Apr 2026 17:02:27 +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 4g0TDf40H5z3wny; Tue, 21 Apr 2026 17:02:26 +0000 (UTC) (envelope-from security-advisories@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1776790946; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=1ATcpTKPCjCEuCSaVyI5gQ6Qnx253FQKtdaVpJKvnG4=; b=uZ/7MxN3O610hxq7fzabIsCeUSRBcWjGjOtbfUCdRVBMY6RU+4559va4w/Y9z9OTbZAttT 58mxa87++cnztdhNmm5I753N0rdh4/dss2wHTBrbo7h671IIG5nknzLfyqYSErVG7zQyCW 9YpPoTHKe03Kjwybid1N/RUzU8Vpc6gh2iLuBj9qcu1WouaWK+XeZsIy3ho1okliN5cq97 v1kXI2/4TGsv8+S6Bss6pi2OsawnED/NoV365DPY1OklSCtWQxuSrCchSWNAbQ8mLjTL+n NylXM9PcAHJ6MDdidNs2fkSu4gpfjGXBultnAOAS+MpIa6DpGROQd9BN71AvlQ== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1776790946; a=rsa-sha256; cv=none; b=ntcFS3JyBLmJObhBgUkfCK+xLuI46HwXtIMb5P2kmMuUJtbYuYsiS5bVpY5AUGKvu8BAai SkFQN07tSHMSQFwBnwSkZwLUgHhRLvX2v36Jga+hqFg28L3MUSfb6kLn1ediYbs0laF0hM oPmPrrfgRUswG2Q0oR3AkqolGOlnpIE7Vf+dVkJ3y6FRY2NnVKL0JKf31E7kJDv9E0wBde /9o6JwmTPkPBXZZWBCabVqf1MpSG/jOEVDXGaXIx2Hs6mSb+ygx7KdIKz+kjvGln8MRMZa YiBaQ5YHdc4T92L2MFa3jhojfvPHZwPUJGA32Csi9/PbZvB9UPYeY5RftOR9XA== 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=1776790946; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=1ATcpTKPCjCEuCSaVyI5gQ6Qnx253FQKtdaVpJKvnG4=; b=NJmGvBCPl6nXfbFvZda4GCYrfhfddQ/LDW4W/CRUk2jTK+fGA8sX5E7bwRCUCpMvWcG4zR gDsAnaFoOrsBpxhnj3qU0X8iF0A7YJDYYSdaJRzSIlcNtvTXXFRpNSMmBEOlZai85hh+eX b9INzybkpiZXp8+BYSEfwMhw7dZ9FwAhoocbuWEzGNnSADQx608s/XOZcftsV1Gw6HRv9p NGayqcmjbMiuE5VkGxsL2PCcgSlUZmFFMOxCveFweIq2pUZRobKOM5QYJgoGWRcSIYgPH4 wPlVikAp8nCS3O+oAdzWvOStoJ3Sxza8DWhG+mIcNDEuxxbfNEAQF+7OVxQmPw== Received: by freefall.freebsd.org (Postfix, from userid 945) id 811751FDAD; Tue, 21 Apr 2026 17:02:26 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-26:11.amd64 Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20260421170226.811751FDAD@freefall.freebsd.org> Date: Tue, 21 Apr 2026 17:02:26 +0000 (UTC) List-Id: Moderated Security Notifications [moderated, low volume] List-Archive: https://lists.freebsd.org/archives/freebsd-security-notifications List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-security-notifications@freebsd.org Sender: owner-freebsd-security-notifications@FreeBSD.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:11.amd64 Security Advisory The FreeBSD Project Topic: Missing large page handling in pmap_pkru_update_range() Category: core Module: amd64 Announced: 2026-04-21 Credits: Nicholas Carlini using Claude, Anthropic Affects: All supported versions of FreeBSD. Corrected: 2026-04-21 15:43:03 UTC (stable/15, 15.0-STABLE) 2026-04-21 15:44:28 UTC (releng/15.0, 15.0-RELEASE-p6) 2026-04-21 15:43:14 UTC (stable/14, 14.4-STABLE) 2026-04-21 15:45:32 UTC (releng/14.4, 14.4-RELEASE-p2) 2026-04-21 15:46:03 UTC (releng/14.3, 14.3-RELEASE-p11) 2026-04-21 15:43:57 UTC (stable/13, 13.5-STABLE) 2026-04-21 15:47:08 UTC (releng/13.5, 13.5-RELEASE-p12) CVE Name: CVE-2026-6386 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background Memory protection keys are an amd64 CPU feature, available in modern Intel and AMD CPUs, which allow applications to apply access restrictions to regions of virtual memory. On FreeBSD this functionality is provided by the pkru(3) interface. II. Problem Description In order to apply a particular protection key to an address range, the kernel must update the corresponding page table entries. The subroutine which handled this failed to take into account the presence of 1GB largepage mappings created using the shm_create_largepage(3) interface. In particular, it would always treat a page directory page entry as pointing to another page table page. III. Impact The bug can be abused by an unprivileged user to cause pmap_pkru_update_range() to treat userspace memory as a page table page, and thus overwrite memory to which the application would otherwise not have access. IV. Workaround No workaround is available. The bug only affects amd64 systems. 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. [FreeBSD 15.0] # fetch https://security.FreeBSD.org/patches/SA-26:11/amd64-15.patch # fetch https://security.FreeBSD.org/patches/SA-26:11/amd64-15.patch.asc # gpg --verify amd64-15.patch.asc [FreeBSD 14.4 and 14.3] # fetch https://security.FreeBSD.org/patches/SA-26:11/amd64-14.patch # fetch https://security.FreeBSD.org/patches/SA-26:11/amd64-14.patch.asc # gpg --verify amd64-14.patch.asc [FreeBSD 13.5] # fetch https://security.FreeBSD.org/patches/SA-26:11/amd64-13.patch # fetch https://security.FreeBSD.org/patches/SA-26:11/amd64-13.patch.asc # gpg --verify amd64-13.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/ 9331e62e8b80 stable/15-n283066 releng/15.0/ 649db49403a7 releng/15.0-n281023 stable/14/ 4c0e5e3cc441 stable/14-n273998 releng/14.4/ 5787df30dc3e releng/14.4-n273686 releng/14.3/ 979e645dd25e releng/14.3-n271486 stable/13/ b8fc56193068 stable/13-n259846 releng/13.5/ a2f6f2d00125 releng/13.5-n259211 - ------------------------------------------------------------------------- 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----- iQIzBAEBCgAdFiEEthUnfoEIffdcgYM7bljekB8AGu8FAmnnoakACgkQbljekB8A Gu8xHBAA0UShf6OLTcPprJ4YbzORKrmUeN6MPSwrvtn792T01Fi7zXj1IeBd1/N1 25SI2GBhoMWP1wBR9G0Er8Vjv9cn4lnuWCeBIMmaofgLUi/UahT5lLhQGG7e3ypq DdmfyWwnJ7tAkDvxHUH2t3STjzIsQaH2NSTpxcg5bdSbGSPGr7On2RBKalvLLBon SUx8FtlOpDj+TttxidoQcYeez8vCkdgn9PCbA/9cxZlFmy+ioE/14PQU2TAYbcnK mZ3BWOKxRDlBN9zHBwkaSdIgjs6+t0/pCYrlUu2nCaZ9o6dtn/6WtulcuCB/l9DQ UABsdc2uhCZvafdN316lABxaPLm3+uvcOFqRZs24tkLOYk5JxBYQQdaHrZ4cP+xS IgQf/Zl5s/ZlwfzOjzTg54KLyH7yxR5iJ/JIJ2mRJ5PZ9wavYGM6czf4l9w+sYQw wTTQSO/zdLRHgcKUYdq+xpv2AWEkjkZSRxRQhgMZ9rS5V+1MqhnCLs9uCsG/Ns7c Yv7t8I+r7j3gjdEFJRDVW+awHQR2ppI/odmyABaThG3bBdPxXy9pR0IvSYtZKGEW cUjYp2intHCDna0TSa4nzrTlCZCAZijVKeVLXSrYNvrJ9nE3dB8oESP2YASjyJBM VxpRYXmjprazBYcRgt7kf/tSfpky7Cq59H1NU+pVxaR5TAzWvaI= =kWUu -----END PGP SIGNATURE-----