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 D225F3D3D18 for ; Fri, 28 Aug 2026 06:52:56 +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=1787899979; cv=none; b=Ug6bDQ6jAkcNHiJ4sK7i/naEkZmXHdQgGpFLxn+tKENIDmsFF4hYoK671WxBCI+hkxC9oXP+T84QYb8Haig4kdc6lqWaTB91l+aanWOCiOYP0QsJgcc7NUzRxYBpKS/1SFdBiZtbI1DFCv1L8a4hLkKYXgpPjSXGCk5Pd28ErZQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787899979; c=relaxed/simple; bh=c0o0FRLEmqO/5PewOVyW11Wiym7JCIHH/ED7DIe6AOk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=N6xehzXkM/8lZxmR8bOJ7dmkuyw/8i3rrrUbddZ/dzhTS96/ME1x31zgrNczLvg+WM4ql/SVZFlRQYOTe4DKdWv5lMOixCFJZz/a3h14LeHX4nsji5noxue+G5oIsqFu4a4wtZdKj3NIMigk3OjWXiQisuNMoB/GfiZCs2c7RbA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wSa8QgJj; 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="wSa8QgJj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9866C1F000E9; Fri, 28 Aug 2026 06:52:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787899974; bh=Tn5oQWjXJceeGgIPqU+Nb2bFHzFlxeOeMKnr5cPoPSI=; h=From:To:Cc:Subject:Date:Reply-To; b=wSa8QgJjyPNDsIAl7YvrPofpLlSUzkiC+TqPplsOVn0yQD3HgSPc5QX8gPMI7Zt10 XBCQr580gaMC+f8qJF+k7NvudWarb1jLg6p2Kn1NQnixaCfoYXcuSVA98u9D1C98AG V3YIXOWFIHuY243emLMpJzPMlHaUUqAJ7NrmAzpU= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80675: libbpf: Reject non-exclusive metadata maps in the signed loader Date: Fri, 28 Aug 2026 08:49:52 +0200 Message-ID: <2026082849-CVE-2026-80675-bef6@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=2624; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=rYdeoz0VlhtdtCxmabac/0llU7BYY6w7I9q1OjZJ6tU=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkT9QOFf/NIys6/xVF/aNKtLX/WPY47/74oypRz5VXvz tt/X23r7YhlYRBkYpAVU2T5so3n6P6KQ4pehranYeawMoEMYeDiFICJzJBgmKe+ZFLpotb8nkL3 yz9zMzexn136MI1hQafBffX7XxZ/ZGq7N/EgY/Nx4fTzoQA= 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: libbpf: Reject non-exclusive metadata maps in the signed loader The loader verifies map->sha against the metadata hash in its instructions. map->sha is calculated when BPF_OBJ_GET_INFO_BY_FD is called on the frozen map. While the map is frozen, the /signed loader/ must also ensure the map is exclusive, as, without exclusivity (which a hostile host could just omit when loading the loader), another BPF program with map access can mutate the contents afterwards, so the check passes on stale data. With the extra check as part of the signed loader, it now refuses to move on with map->sha validation if the host set it up wrongly. The Linux kernel CVE team has assigned CVE-2026-80675 to this issue. Affected and fixed versions =========================== Issue introduced in 6.18 with commit fb2b0e290147ba01a53dfd92cf91058c9d2ee254 and fixed in 6.18.40 with commit b6862b6a25c6a925fb0b0e549ee4a52a8d2966fb Issue introduced in 6.18 with commit fb2b0e290147ba01a53dfd92cf91058c9d2ee254 and fixed in 7.1.5 with commit 0dad5adeb34b6f78a883e8faa6a1c947a240e7c9 Issue introduced in 6.18 with commit fb2b0e290147ba01a53dfd92cf91058c9d2ee254 and fixed in 7.2 with commit 0fb6c9ed6493b4af01be8bb0a384574eba7df636 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-2026-80675 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/syscall.c tools/lib/bpf/gen_loader.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/b6862b6a25c6a925fb0b0e549ee4a52a8d2966fb https://git.kernel.org/stable/c/0dad5adeb34b6f78a883e8faa6a1c947a240e7c9 https://git.kernel.org/stable/c/0fb6c9ed6493b4af01be8bb0a384574eba7df636