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 9C02A49481C for ; Fri, 25 Sep 2026 10:32:24 +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=1790332345; cv=none; b=cdmSHYY4BXIgSwEx+n6OCsUYAzZBM3ZLJaJ/XmHIIouJzh29ODttuXSZV8O0eAtB/ozVJgfD1cJ6Yxc/YOwgvHf3dPnnfGiRqR414IFUX1DS4+c9ivkWFknXDwAw8hz+h35L6bKupcj+XS5znPLZL1FTIrJkxzdIsPpjSfgHBAg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790332345; c=relaxed/simple; bh=Egow9be36o2WHPwjNVmIf1uczuT3JjOvaMk07gmRS/Y=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=h6HX95LeEYDXGIqTKp/9Y3gFDvSxmatoOWhv0bAn1YncYuV4hA8iUgAa19n2aLw52T13kgZv2Pmkv8fqgJJjMngzsm0aSGkTV+4flg9xJlxA8Qmf1a4RxLqVQbTW7D7Upqq9Ne+3ac3zNKYHPOsZBfmdXW7BLDmsdvEl5WeLup8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=WeBpoUyA; 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="WeBpoUyA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F188C1F000FF; Fri, 25 Sep 2026 10:32:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790332344; bh=UDOsjyJHcYh2sqjGAnnXf4SMx5unZqEj59vNDoR3Nbs=; h=From:To:Cc:Subject:Date:Reply-To; b=WeBpoUyA6Jo8TNCqj0vxiA6E3ukK7xkFY9SLaylCLNxuxrHfnz67so3xPRdgOQGbf qwdGh0Ue5wKr5xfCym6y3hW6fR6PMQPfJa/HZ2LOwxn8oncXLFsWZzkyjSDReYouQ7 /+jQXHQ8Tc6XVPz1v+/02yGJ43xW5biJWl8euLUE= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98006: ALSA: caiaq: Decoupling ep1_in_urb in caiaq dev Date: Fri, 25 Sep 2026 12:25:08 +0200 Message-ID: <2026092524-CVE-2026-98006-e4dd@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=4102; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=KW+EMKsFMdCmS8PfUhvvukooKOYWdpzAFQ94txfWVR0=; b=owGbwMvMwCRo6H6F97bub03G02pJDFnbvBO6Zj9p/xfCG1eTZCKfq3fyrnFD5674ktunHKp7u qbJr3/QEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABP5sZxhwYFmk0s8Oy1jSu4e PuTCV5sqcjXuNcM8rSf3f9s0Xto//3HaDMG95xl5XnzyBwA= 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: caiaq: Decoupling ep1_in_urb in caiaq dev The epq_in_urb object belonging to the caiaq device is coupled within the struct snd_usb_caiaqdev. After usb_submit_urb(epq_in_urb, GFP_KERNEL) executes successfully, epq_in_urb is successfully added to the urbp_list queue of the dummy HCD driver (userspace specifies dummy_hcd as the HCD layer driver for the caiaq USB device). When init_card() calls snd_usb_caiaq_send_command() which subsequently fails due to a timeout, and proceeds to call snd_card_free() to release the card, the embedded ep1_in_urb object is also freed. When the dummy HCD driver detects that the URB has been unlinked, it returns the URB (by usb_hcd_giveback_urb()), which triggers [1]. Decouple the ep1_in_urb object from the struct snd_usb_caiaqdev and switch to using a pointer instead. Separately allocate and manage the memory for ep1_in_urb to prevent the release of the snd_card memory object from interfering with it. midi_out_urb has the same issue as ep1_in_urb and is handled in the same way. [1] BUG: KASAN: slab-use-after-free in usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96 Write of size 4 at addr ffff88803cee1050 by task ktimers/1/29 Call Trace: usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96 dummy_timer+0xaac/0x4d50 drivers/usb/gadget/udc/dummy_hcd.c:2019 __run_hrtimer kernel/time/hrtimer.c:2067 [inline] __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2124 hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2141 Allocated by task 36: snd_card_new+0x7b/0x110 sound/core/init.c:184 create_card sound/usb/caiaq/device.c:429 [inline] snd_probe+0x236/0x1af0 sound/usb/caiaq/device.c:544 Freed by task 36: snd_card_free_when_closed sound/core/init.c:630 [inline] snd_card_free+0x138/0x1d0 sound/core/init.c:662 snd_probe+0x162b/0x1af0 sound/usb/caiaq/device.c:553 The Linux kernel CVE team has assigned CVE-2026-98006 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.22 with commit 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and fixed in 6.12.111 with commit d6dd3c915b0d02457711d8fbaa60efc52144557f Issue introduced in 2.6.22 with commit 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and fixed in 6.18.53 with commit 0c1b907d5db2f3508375776e5b78d69591aa5626 Issue introduced in 2.6.22 with commit 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and fixed in 7.2.7 with commit d41e6c1533f09b27fc562260d41417490d2b6084 Issue introduced in 2.6.22 with commit 523f1dce37434a9a6623bf46e7893e2b4b10ac3c and fixed in 7.3-rc3 with commit 402a9d6aab7ac787ab075adeb562c3db8b8f564b 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-2026-98006 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/caiaq/device.c sound/usb/caiaq/device.h sound/usb/caiaq/midi.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/d6dd3c915b0d02457711d8fbaa60efc52144557f https://git.kernel.org/stable/c/0c1b907d5db2f3508375776e5b78d69591aa5626 https://git.kernel.org/stable/c/d41e6c1533f09b27fc562260d41417490d2b6084 https://git.kernel.org/stable/c/402a9d6aab7ac787ab075adeb562c3db8b8f564b