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 B31393D45D0 for ; Mon, 10 Aug 2026 12:13:27 +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=1786364008; cv=none; b=GkGiOjidoBW+WdyYlMGV6sgfK4ibNqVAO1cDfW9mMnQOOvVMMRqKTsSP/INjfyD+W9nruAZrwDH5kEcvbWVihb3EA5mOZACi+sm/aZ+nA+ojRHt+WUcHFqfCSgW8w1XPRv8W9+7GgBjKNDWfAAWBRZdE1Lku67Jk6dY7AuKkUW4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786364008; c=relaxed/simple; bh=2lV6nT7pA8CdLiprbMP+zdw3E6D4ZHOtp9qbnZM/2jU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=V16heJ5INwtthH3z8IvsEeEVzmPHSe/qem6POQz2YXf6s5KwVfkD2uc+Y6DuqbCeY0dql3bZOfgxi/Bfs5glMAG7EF5M/naKGd/srsBmEcsfGEu9qOYJOrDXY3NM4DT1vNzwKBw9oRHP2qi2yw5xmtDkvvV8cwCYlVOgfJX9cH0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=imtBc2Lv; 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="imtBc2Lv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3534C1F000E9; Mon, 10 Aug 2026 12:13:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786364007; bh=PHyk0fcQ3O6Mwj94HHput/aJ8y9eVJqEY6X0J75AbjI=; h=From:To:Cc:Subject:Date:Reply-To; b=imtBc2LvPuOa+qr0ZTsVL9tqLizQPclROGy4Dc7jIT2R6j0xNO8vZ7xSfXR8BfC1p CR1u4/1jyxgCFYHF7+DQ1okMcjgN1HXy2Ra1U2pvsuY6NdzP0b7arLNvffgfHO/FDR mQ2UGvOrFLFzW1LqlqYC9TDvbkqf2eeu/BqXUNfo= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-68393: Bluetooth: hci_sync: extend conn_hash lookup critical sections Date: Mon, 10 Aug 2026 14:01:50 +0200 Message-ID: <2026081047-CVE-2026-68393-640d@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=2671; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=XoFvqX6gljGODgmd05C1JI2LEzssXo9NQ86A6l7yH/Q=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmVe3YXJH+0+LJ41nWh/3vYfvkoqm3hmL8lMPJBKz/7z nCTxZ91OmJZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAizXkMc8UlJly6wznNQHLZ yrD0N9d4+nn27WFYsKN2wrr4dVxxOvNFXr3/+z+n92HcdQA= 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: Bluetooth: hci_sync: extend conn_hash lookup critical sections Using RCU-protected pointers outside the critical sections without refcount is incorrect and may result to UAF. Extend critical section to cover both hci_conn_hash lookup and use of the returned conn. Add surrounding rcu_read_lock() also when return value is not used, in preparation for RCU lockdep requirement to hci_lookup_le_connect(). This avoids concurrent deletion of the conn before we are done dereferencing it. Also, make sure to hold hdev->lock when accessing hdev->accept_list. The Linux kernel CVE team has assigned CVE-2026-68393 to this issue. Affected and fixed versions =========================== Issue introduced in 6.15 with commit 6d0417e4e1cf66fd917f06f0454958362714ef7d and fixed in 6.18.42 with commit 83b7e67698d0b93f685875ce82c8d335436834f7 Issue introduced in 6.15 with commit 6d0417e4e1cf66fd917f06f0454958362714ef7d and fixed in 7.1.6 with commit 38326774df6198df0cc2744cc73bf77cb741c538 Issue introduced in 6.15 with commit 6d0417e4e1cf66fd917f06f0454958362714ef7d and fixed in 7.2-rc4 with commit d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d Issue introduced in 6.12.28 with commit eb8b860e87b296bd1874c79a668081efd00f9754 Issue introduced in 6.14.6 with commit 94bf6380e936339a700c0b3171a49baf512aa70b 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-2026-68393 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: net/bluetooth/hci_sync.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/83b7e67698d0b93f685875ce82c8d335436834f7 https://git.kernel.org/stable/c/38326774df6198df0cc2744cc73bf77cb741c538 https://git.kernel.org/stable/c/d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d