From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 9FB223EF67D for ; Fri, 8 May 2026 14:25:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250305; cv=none; b=m4rii68UsM9mh46CHKqMOn476luktm1eQ4iBbRNxT6fB/5sIsQJlpLVqep7rjnQRdK5gBSDhtgncETbNJEMgfHre8lf2YbD8c79+Mz5aCXQu4pQ3zikkqwrn+8BDmfednDAmB+ZmaLMtrcwFiJrMnl1OJ2dVttUC8x3K4Appj+E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250305; c=relaxed/simple; bh=7lMd9RrvyBvCEN+kLSSyJwA52QLvw/d2JuQjldnm130=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=hHdndstXvWMpIcfRz58Ga1fa7Or/NUwCCdYJ8FHYjToiSSMWrdKOI0RX1QDwcCeztQ//vqtYV+O4/nTdDkRwi1z5DRNUTeOrMjtPKo/QItUgrx0kS209Duo7cIDMK0Pwmet4e3HP9VpUsSet/OgVps/rGb1qOkPpgj518YPVY9M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zBWcAdmn; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="zBWcAdmn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36776C2BCB0; Fri, 8 May 2026 14:25:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778250305; bh=7lMd9RrvyBvCEN+kLSSyJwA52QLvw/d2JuQjldnm130=; h=From:To:Cc:Subject:Date:Reply-To:From; b=zBWcAdmnS0mnZbQwFLIw52UWN0Z61pV8kfUkT5pFT7Os4xx4zTDtchbTNMu8fSf/c Hg1a38b0ylB0Qzw8pKiS22yzPc2m96SflmQ04huWhQfU7fYodkfZsKFXv0v3WdTofG F0jYn6fDXgp/xTj2xfTaCBBNXlMHvaj+s/aI8/7Q= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43383: net/tcp-md5: Fix MAC comparison to be constant-time Date: Fri, 8 May 2026 16:21:52 +0200 Message-ID: <2026050833-CVE-2026-43383-0333@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=3088; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=I1jVwoiETECXjkSfscjWnhbJeygYnIk0+scC9mXLjcA=; b=owGbwMvMwCRo6H6F97bub03G02pJDJl/P+ZtnjzfaSY32wy+n6a3fm45nVYz5+NqDwHPfrb7I TeO356v0hHLwiDIxCArpsjyZRvP0f0VhxS9DG1Pw8xhZQIZwsDFKQATeejGMD/ScEpdxMQTvVm7 jOs9sjo8m9g2TWSYn5a9UWGK8KqrZ7pmre4xlahqlHmpBwA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this. The Linux kernel CVE team has assigned CVE-2026-43383 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.20 with commit cfb6eeb4c860592edd123fdea908d23c6ad1c7dc and fixed in 5.10.253 with commit 821c8751fdeecdeecabeb11704dd33439c9e4bbc Issue introduced in 2.6.20 with commit cfb6eeb4c860592edd123fdea908d23c6ad1c7dc and fixed in 6.1.167 with commit 345a9530756528d7ca407663d659c3c40e75c3dd Issue introduced in 2.6.20 with commit cfb6eeb4c860592edd123fdea908d23c6ad1c7dc and fixed in 6.6.130 with commit 5d305a95130a8d08b9545e47f1e18d29d59866cb Issue introduced in 2.6.20 with commit cfb6eeb4c860592edd123fdea908d23c6ad1c7dc and fixed in 6.12.78 with commit 02669e2a4d207068edce7e8b5fafd85822018ce6 Issue introduced in 2.6.20 with commit cfb6eeb4c860592edd123fdea908d23c6ad1c7dc and fixed in 6.18.19 with commit ae3831b44f477de048287493e184fc3ff913b624 Issue introduced in 2.6.20 with commit cfb6eeb4c860592edd123fdea908d23c6ad1c7dc and fixed in 6.19.9 with commit b502e97e29d791ff7a8051f29a414535739be218 Issue introduced in 2.6.20 with commit cfb6eeb4c860592edd123fdea908d23c6ad1c7dc and fixed in 7.0 with commit 46d0d6f50dab706637f4c18a470aac20a21900d3 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-2026-43383 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: net/ipv4/Kconfig net/ipv4/tcp.c net/ipv4/tcp_ipv4.c net/ipv6/tcp_ipv6.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/821c8751fdeecdeecabeb11704dd33439c9e4bbc https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6 https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624 https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218 https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3