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 AF2E23D9DCC for ; Tue, 6 Oct 2026 10:23:32 +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=1791282213; cv=none; b=freXYlxzFlxWLmkm/QCURi60WyKQ7g9Wqg2n7XsxD4y+GP1ykIqY0yuB3n6BRa+NN6Y9ghpCPZRxOIaDUxnrbDya8gtFXmkUwazh37n5iCuHti0/y42w5ro9lHXXrTnWBC6AQgX7942pIdTIcqcwFfpQndAfmDEvu1pGn4E6ym0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791282213; c=relaxed/simple; bh=Z76VJ4oMAgE2iuh172fkZJUjLngBi+yZ0CvO2DbJeVE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=CMRcWncI5CnIlIwa/L+m3jXJi1oZqTNsSbRfqC5cRhRnnB0ANVIWMs5b7n2h9rvMDYi1x/k839xPzlXObCpPx8+Eyvq/Cl5gm/wz7kxHTS5Nw1rqGGo2ztLTleslk/QTCsrlNa19egRZlBMHn327q0LAHpAx++ZitkQBFGrVYz8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=WLjxq8cH; 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="WLjxq8cH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD1FA1F000FF; Tue, 6 Oct 2026 10:23:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1791282212; bh=R3YhrHmd8ARGvYpNBy52l+kSgHh35ZF39k+50J4Yd3k=; h=From:To:Cc:Subject:Date:Reply-To; b=WLjxq8cHeb3tjGqldPcsh5gwCpz8kLsm3j4FNLbvJTVgW7BO0w3bALcnPi/lkGQIq XySQ7NOOGESACZvRcAjExwlQNDjVi/nD7tarVhRfvods3tvST6yZKQEsxdjzpEf3nB y+wpFL0fsAgLUioP6DRxEp+UmP23CYxPePucIv7k= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98237: net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain Date: Tue, 6 Oct 2026 10:45:38 +0200 Message-ID: <2026100648-CVE-2026-98237-c1d5@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=3701; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=aJMtcBOF+OfuQ0wcw7hrHPqnDvedOekt6ohJSxg6u7M=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlHtjJa7Plx4DjLF5P+JXw7JP2YLoneY5xX1OXsaN5rG vb8ke/mjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZhIigXDgh1TrzZmXTmxyXFO 1Kfdpc7pxZrhLAzzI67nnowuYXi/L2PO3EtX3ziZtZ80BAA= 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: net: wwan: mhi_wwan_mbim: guard against a cyclic NDP chain The NDP traversal in mhi_mbim_rx() only stops when wNextNdpIndex is zero. Nothing requires the offsets to advance, so a modem that points an NDP at itself, or at an earlier NDP, keeps the loop spinning forever on one CPU. Break out when the next NDP offset is not larger than the current one. Verified in a QEMU guest with a fault injector feeding the driver's receive callback an NTB whose single NDP points at itself: the unpatched driver spins in mhi_mbim_rx() with one CPU pinned at 100% and the thread never returns. With this check the loop terminates within one iteration. Changes in v2: move the non-increasing check to the wNextNdpIndex retrieval site, as suggested by Loic Poulain, instead of tracking the previous offset in a separate variable. The Linux kernel CVE team has assigned CVE-2026-98237 to this issue. Affected and fixed versions =========================== Issue introduced in 5.15 with commit aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and fixed in 5.15.222 with commit 3ed36ee1b29b028f6bc2ebe100152f61a33df05a Issue introduced in 5.15 with commit aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and fixed in 6.1.189 with commit e4b2c7b50d4f4aa1ddfff731b136d65f65b2b526 Issue introduced in 5.15 with commit aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and fixed in 6.6.158 with commit 19b5e8dd884a530d04482e1a8e547f43cad17ed7 Issue introduced in 5.15 with commit aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and fixed in 6.12.112 with commit 24ade82d6d993274e99c2c6998848751c35292e7 Issue introduced in 5.15 with commit aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and fixed in 6.18.54 with commit 8dad70ff7e25cbcfbcb5101fdbf36d98003eb653 Issue introduced in 5.15 with commit aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and fixed in 7.2.8 with commit 829fec45122da58d77a55a3b7ca514dafab98e77 Issue introduced in 5.15 with commit aa730a9905b7b079ef2fffdab7f15dbb842f5c7c and fixed in 7.3-rc4 with commit 5d063822ac5184939c1ed377a339a01d8ae814e8 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-2026-98237 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/net/wwan/mhi_wwan_mbim.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/3ed36ee1b29b028f6bc2ebe100152f61a33df05a https://git.kernel.org/stable/c/e4b2c7b50d4f4aa1ddfff731b136d65f65b2b526 https://git.kernel.org/stable/c/19b5e8dd884a530d04482e1a8e547f43cad17ed7 https://git.kernel.org/stable/c/24ade82d6d993274e99c2c6998848751c35292e7 https://git.kernel.org/stable/c/8dad70ff7e25cbcfbcb5101fdbf36d98003eb653 https://git.kernel.org/stable/c/829fec45122da58d77a55a3b7ca514dafab98e77 https://git.kernel.org/stable/c/5d063822ac5184939c1ed377a339a01d8ae814e8