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 CD1D44EC671 for ; Wed, 16 Sep 2026 10:38:06 +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=1789555100; cv=none; b=mzIHqrkq+XOBSkHp00uNQi0Udu+K/p0w1FW36nCLK+/O5MRIt0Ie/lYxrCVAm7My8dflmr9EQeexY5gtkyKx2WtirIjRYp7GiXEnrAmwWK1xE5pJ0AqdlqCsRyFAEMHIVSPbeIJ0nxiQcx7RcoVWg8zZzerhqA/rf3/qspt60LI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789555100; c=relaxed/simple; bh=MFsE+mFGmBReXW+Xd5NZKpTZV71TflZigUqiOLBIaS0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=RdLlbgTf3FCCfAMYpNIbnfBMK0gnEatVAne0iSVnrL/bo4ITBX97wsaaqzfLy5bFMES1t/ACPnSrI5Py1zJNU9jdUCPcS5zlr705wAaOW43FOK+oZ+OBZ0f0im/7GdfM55suOwT6FyUBHEgKJrSGV2QD7hYPtmwbTttupnQaQrU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BOElDegc; 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="BOElDegc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 97B3E1F0089A; Wed, 16 Sep 2026 10:38:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789555084; bh=NQZfmenr1cJ18ACjIaZmjksE26MGxgWihMBCPharNw4=; h=From:To:Cc:Subject:Date:Reply-To; b=BOElDegcznqA7hzCyKquSmub3VhxPByhDve0Da1xDEee5sb2aa/gNZRvOpbPJVw0T wAB+GllMAj7bPo5fAqfG2EHBtLC09131Z5AhfZMrIMIKj9yJU1ssKr9SIOlrxC10CI kqBvRf6liZe4b8ibsvOqcLym7MNaS1hdahrTFLxY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89901: media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref Date: Wed, 16 Sep 2026 11:30:31 +0100 Message-ID: <2026091639-CVE-2026-89901-e7b6@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=4654; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=bBYvoxFtTG3iPFgU8WjsVu1klKjwar4uJxqXNnU7WLo=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmr8if/SC269qS6vNZSS4L38rVjszmOZy0p8DUtfpz/7 Pnv+BmTO2JZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAinMYMC05dues763j4tKgF vHNPf9+3cUJmtS3D/LxnG+QTdf3OXS2vezjDs9NoU0ULKwA= 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: media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref airspy_disconnect() clears s->udev under v4l2_lock, but airspy_stop_streaming() unconditionally calls airspy_ctrl_msg() and airspy_free_stream_bufs() afterwards. If a streaming user closes the device after disconnect, stop_streaming() runs and dereferences the NULL s->udev: airspy_stop_streaming() airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0) usb_sndctrlpipe(s->udev, 0) /* NULL deref */ airspy_free_stream_bufs(s) usb_free_coherent(s->udev, ...) /* NULL deref */ The airspy driver uses vb2_fop_release() in its file_operations, so replace video_unregister_device(&s->vdev) with vb2_video_unregister_device(&s->vdev) and move it before clearing s->udev. vb2_video_unregister_device() releases the vb2 queue, which synchronously runs airspy_stop_streaming() if streaming is active, so the URBs, coherent DMA stream buffers and the hardware stop control message all execute while s->udev is still valid. vb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock) internally, and stop_streaming() locks v4l2_lock, so the previous outer mutex_lock(&s->vb_queue_lock) / mutex_lock(&s->v4l2_lock) pair around the unregister sequence would self-deadlock and has been removed. A short v4l2_lock critical section around s->udev = NULL remains so any ioctl path that still holds the file descriptor sees coherent state. Issue identified by automated review of the INV-003 series at https://sashiko.dev/ The Linux kernel CVE team has assigned CVE-2026-89901 to this issue. Affected and fixed versions =========================== Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 5.10.270 with commit c9081e2655188d2d134a741aec837dc70439d505 Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 5.15.221 with commit 75089cea32e5055773bd13116236d08fdc98678a Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 6.1.188 with commit 155d0378ae0d6305cc4840583a6b42d2d0595bff Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 6.6.157 with commit 6e4ea90fdc6608cd5fac342e146ab6ae15d430bc Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 6.12.110 with commit a9a8c37ddda9fa3687b142be9098e1c37b8faf35 Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 6.18.51 with commit 297fee023f46d771a844520675692ea089d80d9d Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 7.2.5 with commit c6749ac8f59cc80eb1b2d52f167fdf13e12655cc Issue introduced in 3.17 with commit 634fe5033951b80ef4b98d8f047cb1083d29170d and fixed in 7.3-rc1 with commit 2f378dc45e685fc825d2dd08e7864666d6fcc009 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-2026-89901 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/media/usb/airspy/airspy.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/c9081e2655188d2d134a741aec837dc70439d505 https://git.kernel.org/stable/c/75089cea32e5055773bd13116236d08fdc98678a https://git.kernel.org/stable/c/155d0378ae0d6305cc4840583a6b42d2d0595bff https://git.kernel.org/stable/c/6e4ea90fdc6608cd5fac342e146ab6ae15d430bc https://git.kernel.org/stable/c/a9a8c37ddda9fa3687b142be9098e1c37b8faf35 https://git.kernel.org/stable/c/297fee023f46d771a844520675692ea089d80d9d https://git.kernel.org/stable/c/c6749ac8f59cc80eb1b2d52f167fdf13e12655cc https://git.kernel.org/stable/c/2f378dc45e685fc825d2dd08e7864666d6fcc009