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 7AA9E44E66B for ; Fri, 11 Sep 2026 19:49:22 +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=1789156188; cv=none; b=Nj/Gb1oMlNWn6auh4tMQwwFW5SEtHd1xJYZ2cLPP4iUMoUC+3wyN5Q4Z/pIs6xpB1H6OhOjghxCb/zUJrosRc0QsfPNu0QlVSJaIHR8gAj0GElmqUV1jAituX/IhfwBxKLAtWYsrn1IvbKgPXe3k0HMwuKYcsi1M3XtOG3lvhnk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789156188; c=relaxed/simple; bh=GCugr+9kQSt1p6Lybhqn6xm8CaKl5iDCR2qtlnuGVY8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=twGAo2kzlxjI1jcBo4Y5UnE/cHVjmVHMsq7glP7UdVi1SfZzLGIO4g952qeirObTP6tEVk0l9ZcqdhCHH0HYhn77iCyq7anD8U51rlQSuBF0ICnJnBqWuG6+SmwZWP4op9g8hJZj7XKUmH2JofXonGve+g05ve9hsbstXslhG9g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=I9PrMs84; 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="I9PrMs84" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD0D21F00898; Fri, 11 Sep 2026 19:49:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789156160; bh=jkJIbVN1ASbDknMePcQzV1Nx1Hs9uTdwryWk1+vxsB0=; h=From:To:Cc:Subject:Date:Reply-To; b=I9PrMs84U2W1LTvYp3LW1QJeWo7Pu4faWxV+juEut7JBGS7l59CCAclCE7ehFCGUk LCZSQMhv0zkqoytIeIcahQmDPCTh5OAP9QYE/Vi20JlS5XWI/KYIS4TquaE/ouzaVc wX4iDhJcC9qOQdoMTjW3CEqxOi5XitMNkgacDDP0= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-81007: ipmi: ipmb: validate write message length Date: Fri, 11 Sep 2026 21:41:53 +0200 Message-ID: <2026091152-CVE-2026-81007-1d75@gregkh> X-Mailer: git-send-email 2.55.0 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=2559; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=fUw3I+3pS6cQu8X2rAoqYeKz3YmnU0zIOxzLwoWR50o=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlLIl0m1S55tv4ec2RYw71vG3ckTq4QX7PTPSYrZ/ttg X/3nc9e7IhlYRBkYpAVU2T5so3n6P6KQ4pehranYeawMoEMYeDiFICJlEkxzBXx4nRedlzz4x1j lYPmZsscYrpnsTMsWP78ZHrVjDaNwA+b+s68bDld0rdgCgA= 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: ipmi: ipmb: validate write message length ipmb_write() read message fields before validating the length byte. A zero or short write can read uninitialized stack bytes. A length smaller than the SMBus header underflows the block write length. Require a non-empty buffer and the minimum IPMB request length. Also require the length byte plus payload before parsing the message. The Linux kernel CVE team has assigned CVE-2026-81007 to this issue. Affected and fixed versions =========================== Issue introduced in 5.3 with commit 51bd6f291583684f495ea498984dfc22049d7fd2 and fixed in 6.12.109 with commit 60939bcda6f3f104ef456fdbf3cc5733c0720fb1 Issue introduced in 5.3 with commit 51bd6f291583684f495ea498984dfc22049d7fd2 and fixed in 6.18.50 with commit 5719431ca2b5fa26560bb38f6202f8b97fa3bbb0 Issue introduced in 5.3 with commit 51bd6f291583684f495ea498984dfc22049d7fd2 and fixed in 7.2.4 with commit a84c6e3d188f2c6e674910929eb790634299d6d5 Issue introduced in 5.3 with commit 51bd6f291583684f495ea498984dfc22049d7fd2 and fixed in 7.3-rc1 with commit 53637506884dbd5c91a89b1a3547d99d80f8ed2c 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-2026-81007 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: drivers/char/ipmi/ipmb_dev_int.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/60939bcda6f3f104ef456fdbf3cc5733c0720fb1 https://git.kernel.org/stable/c/5719431ca2b5fa26560bb38f6202f8b97fa3bbb0 https://git.kernel.org/stable/c/a84c6e3d188f2c6e674910929eb790634299d6d5 https://git.kernel.org/stable/c/53637506884dbd5c91a89b1a3547d99d80f8ed2c