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 B0D093EC829 for ; Fri, 25 Sep 2026 10:26:18 +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=1790331979; cv=none; b=kOKU4/besalJo/1V3mjDjx1iJXy9NBeZZtXCyNotO+WgeU/UVp1/GUrJX6ef8UDyXKJwOzt/hiF+ZcDy5EEgQrG9oSXDSIC21xrK+tlGLahT/cqKSkKYfgKTu7PvWmkcGiKNoUGLij3rmnUaUM8z/qYN6HWcKFyu8mXk018BTkA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790331979; c=relaxed/simple; bh=cYq+AzbKkX0LmF0smn5W92/SbeQQdShOop/zUFyykFc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=E6iyn1mJaGtXv9uiJNevQJOBOfpBtxY/B8y6+QrMnSFttRfEtaeU2M0WWqAT7R3zrHzBKI2SCgyrIcfWLFB7T1ZkvXhCaBUsfFd7lDBZX4aHEoIPjL0P2EKJCORD62abaMlOSU0/wsoggX9jYfzuKnDG+L65aNWv22NWKO7xq5w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ccm4JxL2; 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="ccm4JxL2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 165411F000FF; Fri, 25 Sep 2026 10:26:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790331978; bh=GK8VVRZeQ8kHBR/ceQ47vbmr42zD+NldK3X5H9AKPI4=; h=From:To:Cc:Subject:Date:Reply-To; b=ccm4JxL2UjNN/9qaKe0tEq+Il1BWTnPOvd2W2MjIpcXhouV8adNIVEQQmhYBylPPV /qBN1DooKxYXEDcqmebNua0ZvVQxvlt9L/ZHT8cL3VPHL7r3mFmIgymPVPfxJmGrfU P32rflzpzro+KEcCFHqlPBR0i75cO6FRc4FP7l5c= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-97599: ieee802154: hwsim: serialize pib updates to fix double-free Date: Fri, 25 Sep 2026 12:22:59 +0200 Message-ID: <2026092500-CVE-2026-97599-a745@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=2993; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=6Wn4rkzbakYLTCyI7sJZmjAx7gFe6bd0VC/Au/IRct0=; b=owGbwMvMwCRo6H6F97bub03G02pJDFnbvD2W7cxc/cFcbx5nz23PGXEXTGMNE6oPvXk77X+x4 fbozE8qHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCRSEOGBVe29N3Q39Y4keHR gpPlzqUqJ2+UbmOY769fX9Rj1SqnozF9o3f+vdu7ePZvAAA= 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: ieee802154: hwsim: serialize pib updates to fix double-free hwsim_update_pib() does an unserialized read-swap-free of phy->pib: pib_old = rtnl_dereference(phy->pib); ... rcu_assign_pointer(phy->pib, pib); kfree_rcu(pib_old, rcu); It assumes the RTNL is held, but ->set_channel is not always called under it: the mac802154 scan worker changes channels via drv_set_channel() without the RTNL. Such an update can race an RTNL-held one on the same phy; both read the same pib_old and both kfree_rcu() it, double-freeing the object. With SLUB percpu sheaves batching kfree_rcu(), this surfaces as a KASAN invalid-free in rcu_free_sheaf(). struct hwsim_phy has no lock for pib. Add one and make the swap atomic with rcu_replace_pointer() under it, dropping the misleading rtnl_dereference(). The Linux kernel CVE team has assigned CVE-2026-97599 to this issue. Affected and fixed versions =========================== Issue introduced in 4.19 with commit f25da51fdc381ca2863248c7060b3662632f0872 and fixed in 6.12.111 with commit 9973b3a67a7592a780ea12b08334539a900deec1 Issue introduced in 4.19 with commit f25da51fdc381ca2863248c7060b3662632f0872 and fixed in 6.18.53 with commit d3b8f264ce09573aededd0a97dc41c8147797d8f Issue introduced in 4.19 with commit f25da51fdc381ca2863248c7060b3662632f0872 and fixed in 7.2.7 with commit db6442deecb1f13aeaf4f9d77746ea7555630fb3 Issue introduced in 4.19 with commit f25da51fdc381ca2863248c7060b3662632f0872 and fixed in 7.3-rc3 with commit 979d5b8de8ed4e1f997aef12da5694b99be7b871 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-2026-97599 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/ieee802154/mac802154_hwsim.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/9973b3a67a7592a780ea12b08334539a900deec1 https://git.kernel.org/stable/c/d3b8f264ce09573aededd0a97dc41c8147797d8f https://git.kernel.org/stable/c/db6442deecb1f13aeaf4f9d77746ea7555630fb3 https://git.kernel.org/stable/c/979d5b8de8ed4e1f997aef12da5694b99be7b871