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 5175E3EE1FE for ; Sat, 15 Aug 2026 12:30:11 +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=1786797012; cv=none; b=kND4iKim2gOKWwruoDyqxmRPxa29MKCTIiJgR48b270aJ78zD3GzduMFDvE+PaIAaRDEtv7UsBqQhd421TyAyYaZHm8bezW7LoeeiNIWsd3AcLhVGZvfaCDS0SJz5Zj6pPLTQFLZzTuTOvdd6GYegS202o1xNRewFoKsDEZSiRo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786797012; c=relaxed/simple; bh=qbx2CvBBwX4I0JLbIIqqvpARiSVNZQbVmFCfGEKDohg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Q+w3x+AR+uzXPSboKH5ckBLgTzNZUSR3WHuylYsnhqnmX5MV9KTmuD0qQ5109jR6Y76pIaMYGurcbcVyGaUl6uWypqbs1YwvRC9BWRgGl2M/CqJXYLGKtdLYlQhasFzZY3L3mdrAJTlLqvZEy6qH+luAIO7zy/9VBhAKtYrMyzo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rfZu4poC; 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="rfZu4poC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E27C1F000E9; Sat, 15 Aug 2026 12:30:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786797011; bh=pXKnExwm4RgRD8MlwwlUnN+XJ7xPdK9D12avJbTRHZg=; h=From:To:Cc:Subject:Date:Reply-To; b=rfZu4poC/yVb9L+AfxhohzakNcN4NfTkkv3saHkICKwqiXufgeQlekehko0WUUJS0 Pzt1Jn0RtmVc6QVqZ5MdIohhfBAzEhGIL1Tv/QIXISNpoSbI4CEFPx7mngBbN9FcC1 Pk+eNBfOHMlpE2h6S0n/txHgypEtVHObOAeVnM70= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-74498: ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set Date: Sat, 15 Aug 2026 21:26:19 +0900 Message-ID: <2026081540-CVE-2026-74498-ea47@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=3186; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=2VZ/kh3uPX9Hjc8plZyY073jUS+/2Zwv8TCE/wnHSAc=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNUUesXnSoHLY7mbkoc/XWuzpPEic838gsntv5+/eN2 3P2r6l72RHLwiDIxCArpsjyZRvP0f0VhxS9DG1Pw8xhZQIZwsDFKQAXkWCYzbbOm3epv4Be9F7f Da3z+7auvuvTw7Bgm9Wtgxqu4pprX/1foTLL+PG7jf19AA== 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: ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set When a USB audio endpoint requests full packet transfers via the fill_max descriptor flag, data_ep_set_params() promotes ep->curpacksize to ep->maxpacksize. However, maxsize is left at the original sample-rate derived value. Since u->buffer_size is allocated as maxsize * packets, the resulting DMA buffer is far too small for the requested transfer length. When the USB host controller streams up to curpacksize bytes per packet, it writes past the end of the buffer via DMA, corrupting kernel heap memory. Update maxsize to curpacksize when fill_max is set so that the allocated DMA buffer size matches the actual transfer request size. [ changed to reassign maxsize only when ep->fill_max is set -- tiwai ] The Linux kernel CVE team has assigned CVE-2026-74498 to this issue. Affected and fixed versions =========================== Issue introduced in 3.5 with commit 8fdff6a319e7dac757c558bd283dc4577e68cde7 and fixed in 6.6.151 with commit 3852974608f53e530e27c21d0c6c7d79c17b3f5a Issue introduced in 3.5 with commit 8fdff6a319e7dac757c558bd283dc4577e68cde7 and fixed in 6.12.103 with commit f9b6c9576568169139ac151f7881474f384659fd Issue introduced in 3.5 with commit 8fdff6a319e7dac757c558bd283dc4577e68cde7 and fixed in 6.18.44 with commit 04595233e5606d452f9f47e6989fc7ae7440fd40 Issue introduced in 3.5 with commit 8fdff6a319e7dac757c558bd283dc4577e68cde7 and fixed in 7.1.8 with commit bd65b7191683bebd9923904f0558b9211b9129da Issue introduced in 3.5 with commit 8fdff6a319e7dac757c558bd283dc4577e68cde7 and fixed in 7.2-rc6 with commit d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 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-2026-74498 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: sound/usb/endpoint.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/3852974608f53e530e27c21d0c6c7d79c17b3f5a https://git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd https://git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40 https://git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da https://git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5