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 6FC0E58B6AB for ; Fri, 11 Sep 2026 19:57:26 +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=1789156657; cv=none; b=mQC5QjKWUfn8JcYbnttpMN3dDOJAO9z509CAdYAhCQehgX5K9S6+hEcmDFOvFYHsZYm+IuoLo44NFxaVVGshCramAtXnUv1sN/pPT5zg7Kwb+m2WLLSmt1lq12PC7ctJhtRAa9eWShAN/qW2yvJufCoGICQPs1svZama9ksMM14= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789156657; c=relaxed/simple; bh=HAxQozrc7N4UTthCmlWNzYfjvYkNMMCesr0Fm+b4ATw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Fv/ckXohdM056A+ZmDiTKzv8adTq9XnwtNeKdLBRFjeXXQjnhKJjR2ggnjov28kuhIHlPLLjh09R34350o/Ga5NHeAha/Zc1jkNMDY2jYXjsLOUmWCJtLIt++QNVGpzhqzfq6BWdq2fAftq74AdMsCAGseS3/VugCYsTgfgFiyc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=COm/Ik6s; 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="COm/Ik6s" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3D7D31F0089C; Fri, 11 Sep 2026 19:57:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789156645; bh=61Yj9Zt/oO7J9Aa5HipzNLtMI2j5vrXyKSIpKDK9RKQ=; h=From:To:Cc:Subject:Date:Reply-To; b=COm/Ik6sKrCMG/w6V2Tg/Vg0+QKUw/ws1xjf5bZxTpEsLU+jMAsMcWjMEGIWVoNdT 18qtvGWYFjb3Bzagxkni8ba3fBjp2+3kZFzaxFerNA+77I8e1/S7UQkrcYo3qsRV7z b0vU0k4EV20wboKMx6+2QjDoaRliFLZQICoGo1ys= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89585: auxdisplay: charlcd: cancel backlight work on registration failure Date: Fri, 11 Sep 2026 21:44:34 +0200 Message-ID: <2026091129-CVE-2026-89585-76f6@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=2604; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=Xc/fdNrARxcf0Ute5qoxWEvljgk8hFHkpYGK75OLjkM=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlLIjMlzQ2tuPSCz/gV+QRvU2zOvXPVUNJ8cmnPrG53H s853zI7YlkYBJkYZMUUWb5s4zm6v+KQopeh7WmYOaxMIEMYuDgFYCKiDxnmCnJfTJr8ecnm3rT3 1+/96GFNWb1Pn2GeSWW+bb9po6JB+daTu3o3yfO4JjYBAA== 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: auxdisplay: charlcd: cancel backlight work on registration failure With CONFIG_CHARLCD_BL_FLASH, charlcd_init() schedules bl_work before charlcd_register() calls misc_register(). If registration fails, the caller frees the charlcd object while delayed work still contains its address. Add charlcd_deinit() to cancel the delayed work and turn the backlight off. Use it for both registration rollback and normal unregistration. The Linux kernel CVE team has assigned CVE-2026-89585 to this issue. Affected and fixed versions =========================== Issue introduced in 4.12 with commit 39f8ea46724efbed3ca021863a22337c31be264c and fixed in 6.12.109 with commit fe7ba73dde94c5f413b1588cd444b49105015dda Issue introduced in 4.12 with commit 39f8ea46724efbed3ca021863a22337c31be264c and fixed in 6.18.50 with commit 84858671842ae5857b9ed1202b62f9045373dcd1 Issue introduced in 4.12 with commit 39f8ea46724efbed3ca021863a22337c31be264c and fixed in 7.2.4 with commit ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755 Issue introduced in 4.12 with commit 39f8ea46724efbed3ca021863a22337c31be264c and fixed in 7.3-rc1 with commit e3e3bf40916c1e810df03958cfa7ba6883cdce79 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-2026-89585 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/auxdisplay/charlcd.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/fe7ba73dde94c5f413b1588cd444b49105015dda https://git.kernel.org/stable/c/84858671842ae5857b9ed1202b62f9045373dcd1 https://git.kernel.org/stable/c/ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755 https://git.kernel.org/stable/c/e3e3bf40916c1e810df03958cfa7ba6883cdce79