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 8C7B34EE847 for ; Fri, 4 Sep 2026 15:56:19 +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=1788537384; cv=none; b=cIlSPPgPwqnwP9tZtf5toaddnHU7ijTRGQwPe4u0Mir6kgfSohXYkSX7X5mQZ7+9nI+a0s9mumgiia5+rjfdfL4yhmyYIkxUzgbGbzU6QMSnt/IMROOzZCUfFmiiL2ScAaATApf3Gt+SWx3Jb263uisaS1KzKaWkVCHErTJ/rJA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788537384; c=relaxed/simple; bh=EUS2MeQ+Uu7OKO9y23kD1CZDqKMg6ZbAZ4+tDw/g05M=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=jxQe6Q4jFsQMBj0CKwJRWlsG23lkfFRhu0Zegg+kcL7bsFhNcl/Xmc0QenzRxpFyopPc/p2K+WNAfHuK6c86xu8VenL1OGtchkRQa3TVJtFr4uqdShc22RsY1o4oW3UYZ9+jhCioVony8fu6msarFYF2zc0hSPXR0a4qoZudDM4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=IQfZAZh6; 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="IQfZAZh6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE27C1F00A3D; Fri, 4 Sep 2026 15:56:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788537376; bh=nMWRZWxKzbj8oTpG34ElUAuCFoe/O1jGAfImCC0k1LE=; h=From:To:Cc:Subject:Date:Reply-To; b=IQfZAZh6RcffwC/e/y7SJYBNUMwoZw/MgZrwAk7fs6kG33pCHfbPJFiGi3w28IZ6X 0ifuA+0Co1dZFKKKIJg7ZU9jXRWN5AwmbH92XPR1s1N0hRJG6puhG8v1CKeNGhdbTs lv4GFIk0QKsue7U28M59EUEKeT4dwxxuJ8TJOWcc= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80827: USB: serial: option: fix slab OOB read in interrupt URB callback Date: Fri, 4 Sep 2026 17:52:54 +0200 Message-ID: <2026090454-CVE-2026-80827-4b14@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=4599; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=K9eiF0E4b4pir0mlWUYQDNriR8fhrxfU3Cd/ROSGlyw=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmzXobPKXFYss+uLaxk+oo9khI9T7M5TTz5Ahs0rW4kR 3w1um/SEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABOpL2WYX2Dru7a2ZW7cXlWX /Ybf4yYWej1hZ5gfkezodTpcs+yF+om0akGz37tXs4sCAA== 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: USB: serial: option: fix slab OOB read in interrupt URB callback The interrupt URB buffer is allocated in setup_port_interrupt_in() based on the endpoint's wMaxPacketSize: buffer_size = usb_endpoint_maxp(epd); port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL); When a USB device declares wMaxPacketSize = 8 on its interrupt IN endpoint, the buffer is allocated from kmalloc-8 cache (exactly 8 bytes). If the device sends a short packet (actual_length < wMaxPacketSize), the URB completes with status == 0 and the callback proceeds to read: data[sizeof(struct usb_ctrlrequest)] which evaluates to data[8], accessing 1 byte beyond the allocated 8-byte buffer. This results in a slab out-of-bounds read. Fix this by adding the missing bounds check: first verify that the actual length is large enough to contain the struct usb_ctrlrequest header before accessing req_pkt->bRequestType and req_pkt->bRequest, and then verify that there is an additional byte for the modem signal state before reading data[sizeof(struct usb_ctrlrequest)] inside the conditional. Use sizeof(*req_pkt) instead of sizeof(struct usb_ctrlrequest) for consistency. [ johan: use dev_err(); split signals declaration and initialisation ] The Linux kernel CVE team has assigned CVE-2026-80827 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 5.10.269 with commit fbe60fd2abc8a5561f39719a41ad9a01b5d8e567 Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 5.15.220 with commit 94e5525697b9e91ddc4071129874120a50a4f342 Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 6.1.187 with commit 6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 6.6.156 with commit 030e3a73d3c3aa67c44454649e984d6383cdb7d3 Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 6.12.108 with commit 060db7d48af1e650643c8b8319111a9ea2ce4486 Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 6.18.49 with commit 2ef5560387f2c0713cee975be2b24b281bd90f3e Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 7.1.13 with commit a72a13c83a652516a0e469d275b81d29a7429049 Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 7.2.3 with commit d762aef4eba354066be21a5d88eb2066e282f4c9 Issue introduced in 2.6.12 with commit 58cfe9113e485f7e04bd0eac4fc4251b330af501 and fixed in 7.3-rc1 with commit 885d802f544ca7bfa8f3984d94233cce715bb6b3 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-2026-80827 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/usb/serial/option.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/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567 https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342 https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3 https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486 https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e https://git.kernel.org/stable/c/a72a13c83a652516a0e469d275b81d29a7429049 https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9 https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3