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 8CBEE493622 for ; Fri, 25 Sep 2026 10:32:27 +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=1790332348; cv=none; b=aZXtMzv3pc+Pk2tlL3oPIthXe/mjlek5MBMx4ntzLFXgyz024F7xjFGHW23aSKGSAUauwNAW8dk5ywP6s3QPCOUarwYohIGoHJD7FGtV3pI5QdSlpJBHm8T+yRw7tdu95eS6vGzdMwOiWi5xHSdPuPb2kgy0DBH3UBzS8HyEiuI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790332348; c=relaxed/simple; bh=0UYO+LdsMyno885keNNTAJkR9d8l2oAsUG3NqfldrGU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=uYZL8E06Jeta9brraZ2Fgxz4OGGdU74W9to+ysB6pjTLTQUdxj2dV8E7hSI2IXf+1Mn8CZUPqP4b6YVTP3YcvXW9xUaRqo5+CKYChUXv2zQnMzXIkkA38EcjUjIPTJPobOYRq5qegMEk7QHdg/nbBDBJvuoE5I5ygEv3iv4sYck= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uI/0gE8x; 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="uI/0gE8x" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E17551F000FF; Fri, 25 Sep 2026 10:32:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790332347; bh=ppQ57P93BQFm3GziV709u/x9L55pxNYkYmAfBSdmLr4=; h=From:To:Cc:Subject:Date:Reply-To; b=uI/0gE8x+S4uS2PVRomqh5vvCMY65AVDWFvdTfL/Yv6Vq2hqhADzFZgEt3CcuqoOv 7zkAZymXJ+fk/TDq+hFIJJtl4kiEDKFQiquVnBf/00I8d1NHeVp4vk5DGhm9642YzV SiFtOE+xnzQfTYzruG6FJZhotnyG0fUX+dzGJ0uk= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98007: bpf: Reject non-scalar bpf_loop iteration counts Date: Fri, 25 Sep 2026 12:25:09 +0200 Message-ID: <2026092524-CVE-2026-98007-2ede@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=3136; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=fxMLJfsU4c5ZQ1vZsW7drONytLSZoeoATZJjz8njNQk=; b=owGbwMvMwCRo6H6F97bub03G02pJDFnbvBP8PudWplvM6a1daXT3C8OiN23tsk+PfDzdUaT/k uHPp7COjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZjI1hSG+Z4VDRnrJ6swacYe kzT/V7NaclYcD8OCZQ4nsq9vqF5jcnUux9LQEqnrC/uYAA== 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: bpf: Reject non-scalar bpf_loop iteration counts bpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged programs may pass pointer values to such arguments, so check_func_arg() lets a pointer-valued R1 reach the helper-specific checks. Since commit bb124da69c47 ("bpf: keep track of max number of bpf_loop callback iterations"), the verifier marks R1 precise and reads its upper bound to limit callback simulation. Precision backtracking only accepts scalar registers, so passing a pointer instead triggers the "backtracking misuse" verifier warning. Kernels with panic_on_warn enabled subsequently panic. Introduce ARG_SCALAR for helper arguments that only accept scalar values and use it for bpf_loop() nr_loops. Generic helper argument validation then rejects pointers before loop inlining and precision processing. The Linux kernel CVE team has assigned CVE-2026-98007 to this issue. Affected and fixed versions =========================== Issue introduced in 6.7 with commit bb124da69c47dd98d69361ec13244ece50bec63e and fixed in 6.12.111 with commit 656d40d1ca228ee21a9b3280432479fc9eae75ab Issue introduced in 6.7 with commit bb124da69c47dd98d69361ec13244ece50bec63e and fixed in 6.18.53 with commit e2e1161e03fecff6d2229a81b024337144bfcd97 Issue introduced in 6.7 with commit bb124da69c47dd98d69361ec13244ece50bec63e and fixed in 7.2.7 with commit f8ae8275c721334ee50fafdd986fb83294eb941a Issue introduced in 6.7 with commit bb124da69c47dd98d69361ec13244ece50bec63e and fixed in 7.3-rc2 with commit c3fd8e5fd100f122bad503bdc0e9277219533253 Issue introduced in 6.6.15 with commit bfc5c19b4b48840627af0d0f1c8f4461b276e508 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-2026-98007 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: include/linux/bpf.h kernel/bpf/bpf_iter.c kernel/bpf/verifier.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/656d40d1ca228ee21a9b3280432479fc9eae75ab https://git.kernel.org/stable/c/e2e1161e03fecff6d2229a81b024337144bfcd97 https://git.kernel.org/stable/c/f8ae8275c721334ee50fafdd986fb83294eb941a https://git.kernel.org/stable/c/c3fd8e5fd100f122bad503bdc0e9277219533253