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 585C53A759C for ; Sun, 18 Oct 2026 15:49:23 +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=1792338564; cv=none; b=GPkamVj56FA/y1zu79hVK7WaBoigbK2VM7kEKh2+JNaz6sfDS7hmMbkkAcQ0EK8t8Iaobz7XbRqNehxJqRfcz8pJiaBYt4l05f0qoANS26rlkNFu7cQTudRxtfDGTcWouhUMYzA4josff8SSuEUzUz0HKqlU+ktH3+uZv25Ef2s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792338564; c=relaxed/simple; bh=0yf0WKiWbTRDVWSCS0+M/zHy2XTenvTdmg3LjDm0Zug=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=aLGmQmB1GjOMdBQqbI7E/wtlbsMcpoE404lg7hxKmz+wGoQ4HVPoI+RjPurAuE+bQvlXFAadbrJO3Iq9N+aRWjPcB0WPkQ1EsHT0OakfBuBfwtojnASneky1jDh8LZr/JAz/XoXCLgZASDwtr/bdJE/z6ee0mQks7B1eJE693oY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NVbyEzQj; 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="NVbyEzQj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21E761F000C4; Sun, 18 Oct 2026 15:49:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792338562; bh=k8eofhghfymhJhELtSgccotPsCROHAsPDvK8vWuM+pU=; h=From:To:Cc:Subject:Date:Reply-To; b=NVbyEzQjq1yMXxqdAwnaEOEnBEOp//gUfOwrPrypbbWiLmVCTCllTsR3JIZAYSGiU 5/4O+quZOSudvv6jegzzrwmnZF1qZZkJcNTvU8utpStL71fg/6wJrjZeBiY2KVxWJp tKRGENkwhHDaVL3EXtHF/ju+F5+KVmXnju1zHDfA= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98687: thunderbolt: Reject oversized XDomain properties responses Date: Sun, 18 Oct 2026 17:44:22 +0200 Message-ID: <2026101802-CVE-2026-98687-bf91@gregkh> X-Mailer: git-send-email 2.56.0 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=3071; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=z5mCk9vuHFfOHRj2r+KR58ATZqGKF8sAxg9oR6dw9E0=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlXXjpdVGo5+DH1Vv/0wrTpUvpMIosP6/isM1v5rdPms qvSUcUNHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjAR3kSG+R7J3zImKF1N5yoV ri/j/H7ixV7e5wzztA5HC2dYcswRj+VVeHUoeUb2et0CAA== 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: thunderbolt: Reject oversized XDomain properties responses tb_xdp_properties_request() allocates room for 45 data dwords in its 252-byte response buffer. The XDomain length field is six bits wide, however, and a malicious peer can set it to 63. After the fixed response fields are subtracted, the driver treats this as 48 data dwords. Commit 322e93448d90 ("thunderbolt: Clamp XDomain response data copy to allocation size") only bounds the copy against data_len. If data_len is at least 48, memcpy() reads 192 bytes from the 180-byte res->data array, causing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478 ("thunderbolt: Limit XDomain response copy to actual frame size") limits the earlier copy but does not constrain this header-derived length. Reject response data lengths that exceed the allocated source buffer before copying them into the assembled property block. The Linux kernel CVE team has assigned CVE-2026-98687 to this issue. Affected and fixed versions =========================== Issue introduced in 4.15 with commit d1ff70241a275133e1a0258b7c23588b122276c8 and fixed in 6.12.113 with commit a766a86ff48acee76aeb8e2575771040749e509d Issue introduced in 4.15 with commit d1ff70241a275133e1a0258b7c23588b122276c8 and fixed in 6.18.56 with commit 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa Issue introduced in 4.15 with commit d1ff70241a275133e1a0258b7c23588b122276c8 and fixed in 7.2.10 with commit 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a Issue introduced in 4.15 with commit d1ff70241a275133e1a0258b7c23588b122276c8 and fixed in 7.3-rc6 with commit 80756e263846ab694984e749e8c626897331438f 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-2026-98687 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/thunderbolt/xdomain.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/a766a86ff48acee76aeb8e2575771040749e509d https://git.kernel.org/stable/c/2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa https://git.kernel.org/stable/c/737a1d2e9642d5f718bd29aa4a98b9eef3832f0a https://git.kernel.org/stable/c/80756e263846ab694984e749e8c626897331438f