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 5E1B6436BEE for ; Mon, 20 Jul 2026 16:28:47 +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=1784564933; cv=none; b=Lb5NWAhGMC4RLUSC5e49PSFvtfMzc/TrqHLyroTOO1sVoECu/9OawcNyorHSIlB5LqMqeiD29oub/Cl3g5mnoR4IQgqdr+I7IJq7HbtdV3UyvxCM1WBughC3ipVUA1mExxO2zfCHYNiJSgSNVsoeSJCjvWXfSmuaiDC78oL7SO0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784564933; c=relaxed/simple; bh=aCuls40F2QpPkkKg943b66J5tKzS4lz5PWjcMTiyO7I=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=h6IIssaWSKwPCJsp/IpF+HVhNSjrIxUd8UKL37uQyLxOL/YA61ILlww4wrzhtuSrg/pSMl7uat4QRrmXW7yPcGaCr1TKtt4ND1AKhObxLmLyg+JkRknWKvscLH0kwuW9RkqN9faEo4UI11XIJC4ts6x0D4eKpkV1xaUbmG6Xy6I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vUJZsw8a; 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="vUJZsw8a" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DBCB71F000E9; Mon, 20 Jul 2026 16:28:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784564927; bh=OxsBKMSFueadLz58YjnZAfBacGyRkQZlYLeqWbEGbEU=; h=From:To:Cc:Subject:Date:Reply-To; b=vUJZsw8atY8qBsIfutlif+WtQi0rPVsDur+ueMRbj4LdqTJ/sSDjOUSePNBFxyjt/ TtOgAD8c4f3Qpi3rwQ+qUXoRuFlM9r89Qv8ho3CTktP34KrLnn37Fxs0zZy1/Gc21h jU5cFSk4bIP9mHKWaTghFqe6WP3My2/fFUzYyGJo= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-64207: net/sched: dualpi2: fix GSO backlog accounting Date: Mon, 20 Jul 2026 18:27:58 +0200 Message-ID: <2026072053-CVE-2026-64207-e76b@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=2768; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=0f2ozRb3GSsncCw2NCfm/ksrDQOGH3pFkJVjbSXl8bA=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlxPp23wiY6Tu1fKrVZeqqafNKben3FuKcezwPrd229E 7ZlYdz7jlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZhItRHDgo2Gv7cLZvh23a4p flUQcunn1QjtCoa5wmYVDMqVb2VEPe985vy/ebu15jkHAA== 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/sched: dualpi2: fix GSO backlog accounting When DualPI2 splits a GSO skb into N segments, it propagates N additional packets to its parent before returning NET_XMIT_SUCCESS. The parent then accounts for the original skb once more, leaving its qlen one larger than the number of packets actually queued. With QFQ as the parent, after all real packets are dequeued, QFQ still has a non-zero qlen while its in-service aggregate has no active classes. qfq_choose_next_agg() returns NULL and qfq_dequeue() passes the result to qfq_peek_skb(), causing a NULL pointer dereference. Follow the same pattern used by tbf_segment() and taprio: count only successfully queued segments, propagate the difference between the original skb and those segments, and return NET_XMIT_SUCCESS whenever at least one segment was queued. The Linux kernel CVE team has assigned CVE-2026-64207 to this issue. Affected and fixed versions =========================== Issue introduced in 6.17 with commit 8f9516daedd67097a0c6e463fcb7a42b5ee9d477 and fixed in 6.18.39 with commit c4b70c1512b8f9f33f23c2c8196dfd1210207681 Issue introduced in 6.17 with commit 8f9516daedd67097a0c6e463fcb7a42b5ee9d477 and fixed in 7.1.4 with commit 806586e33891066487db1f002be3d455cda6b516 Issue introduced in 6.17 with commit 8f9516daedd67097a0c6e463fcb7a42b5ee9d477 and fixed in 7.2-rc1 with commit 05ed733b65ab977dd931e7f7ac0f62fdb81205c2 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-2026-64207 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/sched/sch_dualpi2.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/c4b70c1512b8f9f33f23c2c8196dfd1210207681 https://git.kernel.org/stable/c/806586e33891066487db1f002be3d455cda6b516 https://git.kernel.org/stable/c/05ed733b65ab977dd931e7f7ac0f62fdb81205c2