From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F2467324B20 for ; Wed, 27 May 2026 12:19:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779884392; cv=none; b=MiuepVHfcv+lPhNiYksCYCH+aY7v2OOcL9ZG42uBpxdZLIefBqsuID1hRiNMXFxYRw4DMSxowhqJVne6Ip98b0eBGIgjV1RCcIn0FVFv5FuAq5oKnSTXSp229DOL+oH5IohPJMS8oJyVhoS20OJ2izO43Se06qMAO5ZuFrnboQQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779884392; c=relaxed/simple; bh=n8ZzxkmBVXxISavp9HX/NriC+hTO2um4WEXFAi30mjw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=RlnJehcxKgJksT5OqZCPY63uhix2i3FU7OldHsq7h1aE8ViOv/e6jdRLtjxxasLWrUihjg4f2AfhvSWIqR2E0HL6TMjKpMARyUfelQEL9IY9sEPhvdfd19qdi/1/P1dWwPCq1+pr/AdXsq2E/Pg2Fyf9638GtuT9PMYTCEGfr6w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=DLCWLIVb; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="DLCWLIVb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 112FB1F000E9; Wed, 27 May 2026 12:19:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779884390; bh=RaaVBFjHnxUlkGrCSMYXYACJQnyFGvGdIVv38hcHwxk=; h=From:To:Cc:Subject:Date:Reply-To; b=DLCWLIVbtpiNtE3EOHcaX+zvfmgmHALmBFWz+O7EvG5W/+tkBkPY/2ucMawFTcFr8 Io63KIeCZF8javn78X1oliEQvEHFHBeaeU3dwGU8SYtGr8mpEfW+kvaM5313Kd+Xjp Mqygg7BtJlmdi6O3nZMnBRd3+rFnQnngbiQ6n3D0= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2025-71304: smack: /smack/doi: accept previously used values Date: Wed, 27 May 2026 14:18:03 +0200 Message-ID: <2026052705-CVE-2025-71304-4972@gregkh> X-Mailer: git-send-email 2.54.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5440; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=6De+eQbl9auBpigCXI2yoEFJ7g9VaHaAxdkg2uib5mE=; b=owGbwMvMwCRo6H6F97bub03G02pJDFliD/7+5Pnv29H6ZZPmnv5NMbl/Pl1+MSHi1J5Irl/77 2XvXBcv2xHLwiDIxCArpsjyZRvP0f0VhxS9DG1Pw8xhZQIZwsDFKQATKZvGMD/uWvaFsjVOrrlL LpseX7XKxLNrlibDgsV/w9hUk411i5vvLqn5Jv336ZXqXgA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: smack: /smack/doi: accept previously used values Writing to /smack/doi a value that has ever been written there in the past disables networking for non-ambient labels. E.g. # cat /smack/doi 3 # netlabelctl -p cipso list Configured CIPSO mappings (1) DOI value : 3 mapping type : PASS_THROUGH # netlabelctl -p map list Configured NetLabel domain mappings (3) domain: "_" (IPv4) protocol: UNLABELED domain: DEFAULT (IPv4) protocol: CIPSO, DOI = 3 domain: DEFAULT (IPv6) protocol: UNLABELED # cat /smack/ambient _ # cat /proc/$$/attr/smack/current _ # ping -c1 10.1.95.12 64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.964 ms # echo foo >/proc/$$/attr/smack/current # ping -c1 10.1.95.12 64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.956 ms unknown option 86 # echo 4 >/smack/doi # echo 3 >/smack/doi !> [ 214.050395] smk_cipso_doi:691 cipso add rc = -17 # echo 3 >/smack/doi !> [ 249.402261] smk_cipso_doi:678 remove rc = -2 !> [ 249.402261] smk_cipso_doi:691 cipso add rc = -17 # ping -c1 10.1.95.12 !!> ping: 10.1.95.12: Address family for hostname not supported # echo _ >/proc/$$/attr/smack/current # ping -c1 10.1.95.12 64 bytes from 10.1.95.12: icmp_seq=1 ttl=64 time=0.617 ms This happens because Smack keeps decommissioned DOIs, fails to re-add them, and consequently refuses to add the “default” domain map: # netlabelctl -p cipso list Configured CIPSO mappings (2) DOI value : 3 mapping type : PASS_THROUGH DOI value : 4 mapping type : PASS_THROUGH # netlabelctl -p map list Configured NetLabel domain mappings (2) domain: "_" (IPv4) protocol: UNLABELED !> (no ipv4 map for default domain here) domain: DEFAULT (IPv6) protocol: UNLABELED Fix by clearing decommissioned DOI definitions and serializing concurrent DOI updates with a new lock. Also: - allow /smack/doi to live unconfigured, since adding a map (netlbl_cfg_cipsov4_map_add) may fail. CIPSO_V4_DOI_UNKNOWN(0) indicates the unconfigured DOI - add new DOI before removing the old default map, so the old map remains if the add fails (2008-02-04, Casey Schaufler) The Linux kernel CVE team has assigned CVE-2025-71304 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.25 with commit e114e473771c848c3cfec05f0123e70f1cdbdc99 and fixed in 5.10.252 with commit eb718a3c8181ada679340db34cd61bce48e44749 Issue introduced in 2.6.25 with commit e114e473771c848c3cfec05f0123e70f1cdbdc99 and fixed in 5.15.202 with commit 6ec091c5c7eeabd249a7c46813cad1e9f555f859 Issue introduced in 2.6.25 with commit e114e473771c848c3cfec05f0123e70f1cdbdc99 and fixed in 6.1.165 with commit 199452f22d2f74b897fe826f81ec402b0a8461a0 Issue introduced in 2.6.25 with commit e114e473771c848c3cfec05f0123e70f1cdbdc99 and fixed in 6.6.128 with commit 1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3 Issue introduced in 2.6.25 with commit e114e473771c848c3cfec05f0123e70f1cdbdc99 and fixed in 6.12.75 with commit f8071500177f38cff38892bd85ac631cc6e010b2 Issue introduced in 2.6.25 with commit e114e473771c848c3cfec05f0123e70f1cdbdc99 and fixed in 6.18.14 with commit 5a247a84de0ba44edbbd6be851c8a6b2aa60ff85 Issue introduced in 2.6.25 with commit e114e473771c848c3cfec05f0123e70f1cdbdc99 and fixed in 6.19.4 with commit 8beebb8ad9a003f978e53b06237986588223e15e Issue introduced in 2.6.25 with commit e114e473771c848c3cfec05f0123e70f1cdbdc99 and fixed in 7.0 with commit 33d589ed60ae433b483761987b85e0d24e54584e Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-71304 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: security/smack/smackfs.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/eb718a3c8181ada679340db34cd61bce48e44749 https://git.kernel.org/stable/c/6ec091c5c7eeabd249a7c46813cad1e9f555f859 https://git.kernel.org/stable/c/199452f22d2f74b897fe826f81ec402b0a8461a0 https://git.kernel.org/stable/c/1c7ee23dfcd18d80770d8f90f2ab5bb1b2bfd8a3 https://git.kernel.org/stable/c/f8071500177f38cff38892bd85ac631cc6e010b2 https://git.kernel.org/stable/c/5a247a84de0ba44edbbd6be851c8a6b2aa60ff85 https://git.kernel.org/stable/c/8beebb8ad9a003f978e53b06237986588223e15e https://git.kernel.org/stable/c/33d589ed60ae433b483761987b85e0d24e54584e