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 EFCE34B2714 for ; Thu, 24 Sep 2026 16:10:24 +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=1790266226; cv=none; b=n2ZazEGMdKrYrLwehLsw9mOuAHuMB5Z6xIEi3psetld0MsITjj6Su3L/gqS8lSJkxfIhxCJAWULYIKqRW1TgNg3A2Rzo1x2q8IOgP/KZT5fm7JyfG/uF4k6gxjqE6b73RpPIQ24e0UxoGO0rDurzHXHgnl5SQjV/H2TfzHx3XZk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790266226; c=relaxed/simple; bh=sT0J6LBL4hQLxbOl///I02uwmnVjxin9mOCD6qIRACk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=T/AwXYblsNNk0y01R1dqUNBWrR0c6bFSOr2Dxq1vNQYKexufbhnF51CXa7UAI9sU3IVyL+ul78vdJxptsyJuNPOmibnSlmYJTyWONUQoVFdT3mrOV2sNklt81VUkXq+KA0x3Qgb9C1QQ+KYluX/U1QsD5S/ZiTlLbaC2AlYV4XU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=f030h/N4; 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="f030h/N4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A0E21F00893; Thu, 24 Sep 2026 16:10:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790266224; bh=cy5lMA8TpDa/A0nXBfciTWWFb75kqMmILABxFFsUcIs=; h=From:To:Cc:Subject:Date:Reply-To; b=f030h/N43llK4OMCgWg0qQ0dhayegooPc582HkxBYCLK1Ytf3iG0mO4cD5oSw8GL7 fEKTWiVkchx/NMfwn+fAZILlSRKPtrXi+W8oyA8SkBohHn4lkMILCoeejka6JsVfDx Tstoy+3L70R2/heVls/UBhd5/EfXOnanjWI2o870= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-97408: Bluetooth: L2CAP: validate connectionless PSM length Date: Thu, 24 Sep 2026 18:03:08 +0200 Message-ID: <2026092425-CVE-2026-97408-87ad@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=2416; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=SExTDBM3yf+6eufC9LK24F3cuZEuYTzecu0s8tW3dGo=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlbPSc6yD52P/sgun3ie37PKZ0Zr/eobGXV2TF3e/oDB k3rR+F9HbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCR1fsYFlwz2pxzs+jkjTa+ 3BuhSb3ywt+aChgWrHn4nJFnjqCA9e/HbAlHemXdxF+sAQA= 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: L2CAP: validate connectionless PSM length Connectionless L2CAP frames carry a two-byte PSM at the start of the payload. l2cap_recv_frame() currently reads that PSM unconditionally after validating only the outer L2CAP length. A malformed connectionless frame with a zero- or one-byte payload can therefore make the parser read beyond the advertised skb payload and use tailroom bytes as part of the PSM. A VHCI-backed QEMU reproducer injected a one-byte connectionless payload and reached the unchecked read. Reject connectionless frames that cannot contain the PSM before reading or pulling it. This preserves all valid connectionless frames while dropping only structurally incomplete packets. The Linux kernel CVE team has assigned CVE-2026-97408 to this issue. Affected and fixed versions =========================== Fixed in 6.12.111 with commit 3502ede8aed3c3ee1786d952a11054ac737d1a38 Fixed in 6.18.53 with commit ae69dca122f6d6046a68cf40153e6e827c77ff5c Fixed in 7.2 with commit a40a5f922546b3bd7c094d882b29177db4f2abe0 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-2026-97408 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/l2cap_core.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/3502ede8aed3c3ee1786d952a11054ac737d1a38 https://git.kernel.org/stable/c/ae69dca122f6d6046a68cf40153e6e827c77ff5c https://git.kernel.org/stable/c/a40a5f922546b3bd7c094d882b29177db4f2abe0