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 B7FE93783A0 for ; Sat, 15 Aug 2026 06:27:38 +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=1786775259; cv=none; b=IAuG1ZViEJmFzUlgi9VVeeObUR1DZwShW6jbY15J7rTBKQSGxVxV/oEGx+oQVmQ46S1RxuqFdc+Fg3PXyaO8AEpmLF6dsDs4IxfUQXXkseMXPNKDxRK2z37x4U4cIHkAdSf1hy9epa3anxBIol1Nz1STad0mxQCzy8m8s0cXECs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786775259; c=relaxed/simple; bh=4sHbios7GkN544b1EjB+tvGtx8XAMwHPjgyozLd2E0I=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=vGCReFyeVenXDA3d7G7B1mpjKiWiJPzRzqTSoQXRNopekVxIUOCV+7RGKTUAxU/qWfCD6kJz+MXnkodda03xGiKGhvdBNHDGX3Tro6zm1pBjiwqIYFOezK6elHFwihqXKlDNIoDPD3CwfxIvklJK2eBknRlJHkTvTYWBKg4diQk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=lwGYbEzV; 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="lwGYbEzV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 175DE1F000E9; Sat, 15 Aug 2026 06:27:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786775258; bh=0A/Uaffu45r/WjV6cnI7lcfwku90N1kxqcwphPn38+g=; h=From:To:Cc:Subject:Date:Reply-To; b=lwGYbEzVl13yaU3jaW/s27CZrlUnwWCUqYNB/w6EZcSWnO2JUrgBtBUzEvJBMmLAg x5uRWnZWNpWgkRHrS2aGAwmF+nLIhIMXkAYqADlqsoLn+vG1m+nU4wiTrf1eR8QJiJ pFO0SEYKEnfBVX/vs3f15FE+Gw7aiV+b549SP42U= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72426: bpf: Preserve pointer spill metadata during half-slot cleanup Date: Sat, 15 Aug 2026 15:08:25 +0900 Message-ID: <2026081526-CVE-2026-72426-8fec@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=2467; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=fYStG0IB+kpdkfEkctsx021ArXrRIHEzrhIgdetKSIU=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDJ8u8TzddTfwZpvZralnF7NPENwYLbb1nQLbUe0+H v/0HQbJHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCRU9kMCzYkLt3F36D5oHdL +55DXJ31T8+8uMAwh0dYRaPpqLrKCskPwVNcvzzdJnLwMQA= 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: Preserve pointer spill metadata during half-slot cleanup __clean_func_state() cleans dead stack slots in 4-byte halves. When the high half of a STACK_SPILL slot is dead and the low half remains live, cleanup converts the live low half to STACK_MISC or STACK_ZERO and clears the saved spilled_ptr metadata. That conversion is safe only for scalar spills. For a pointer spill, this metadata clear lets a later 32-bit fill from the still-live half avoid the normal non-scalar register-fill check and be treated as an ordinary scalar stack read. Leave non-scalar spill slots intact in this half-live shape. This is conservative for pruning and preserves the existing check_stack_read_fixed_off() rejection path for partial fills from pointer spills. The Linux kernel CVE team has assigned CVE-2026-72426 to this issue. Affected and fixed versions =========================== Issue introduced in 7.1 with commit be23266b4a08540aa43d8503a2ea10247c8daebe and fixed in 7.1.5 with commit 0f9278b22cda6fd2525049930157b79b4036b4ef Issue introduced in 7.1 with commit be23266b4a08540aa43d8503a2ea10247c8daebe and fixed in 7.2-rc1 with commit 3a354149bceacadbcf7d7b4766f5ef26a85892ab 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-2026-72426 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: kernel/bpf/states.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/0f9278b22cda6fd2525049930157b79b4036b4ef https://git.kernel.org/stable/c/3a354149bceacadbcf7d7b4766f5ef26a85892ab