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 9489C2E7390 for ; Sat, 15 Aug 2026 06:31:26 +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=1786775487; cv=none; b=pqPNroUctVPOxKrNquXM808rZm2Z+IEDM40Yzad4/HJns9Kv05J93d/GGPXkC6l0Re+4JsHq7on+FxZ3AITUgw7SXSzZPo9g6745L23mAO2rJhq5UpOuvnvHQixNMmzZXBUIg3NuXyfw0bjbvAtu3gwQfigpvKwTmnnfJx/BD24= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786775487; c=relaxed/simple; bh=gASCbbJZTGpq6tHLx/rYWh6qYfxqwX1BSQV/mrJ2nxA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Cz6WPhLxCfNkjC9QmSFHxYn2P7fnIKJqz1nQqfvIMzt1k7E7MPDAXv/PXtXvDqUASfekJQxArCK4LvSgrK3tiM/j4px1JGLp8TUOVBw8hFkrxn/yy/Kob3LhRzyfVXXFr4hgAbfUW5C7oQPld6o/t3yysxKOGrpMAfoi6Udqf1I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=FumeyCxh; 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="FumeyCxh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E25DA1F000E9; Sat, 15 Aug 2026 06:31:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786775486; bh=db3n6Sg8z9CGWOm6DRv58yIQs/mICrSQLj84BUIkWSs=; h=From:To:Cc:Subject:Date:Reply-To; b=FumeyCxhljA/qeiPwqVSnOa5eUYPrPAYhE0bZehBDX4qCN89ynLn1wMMlp0Vy2XUF najbH9gX+kXMz5muSlyh79efbeI7yJ4qyNv6PIrt2+DYhNPnv60cjHc13ye6VY4g3K RltI0UnKa6Vap7A3CxPOSJ0g1NWl4Mb/+NMLHS+w= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72463: xfrm: Fix dev use-after-free in xfrm async resumption Date: Sat, 15 Aug 2026 15:09:02 +0900 Message-ID: <2026081533-CVE-2026-72463-5eb9@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=2673; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=opCp9IR77wtpRdC/XY7gT33T9GKBtXnI4Qt3+VcQh7w=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDD9NKjwvrQlZFGr5Vzflw+4Dvpl9v10ObHjqfrKL9 dOBPhPXjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZjI/iqG+d5vtgRsEKueHlh2 l1MvJS7o29MjbxnmO4V4rosK4W6reGpw+71D6LmtfueKAA== 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: xfrm: Fix dev use-after-free in xfrm async resumption xfrm async resumption hold skb->dev refcnt until after transport_finish. However, xfrm_rcv_cb may modify skb->dev to tunnel dev without taking device reference, such as vti_rcv_cb. The subsequent async resumption will decrement the tunnel device's reference count, which lead to uaf of tunnel dev and refcnt leak of orig dev as below: unregister_netdevice: waiting for vti1 to become free. Usage count = -2 Stash the original skb->dev to fix refcnt imbalance. The new skb->dev set by xfrm_rcv_cb can race with device teardown. Extend rcu protection over xfrm_rcv_cb and transport_finish to prevent races. The Linux kernel CVE team has assigned CVE-2026-72463 to this issue. Affected and fixed versions =========================== Issue introduced in 7.0 with commit 1c428b03840094410c5fb6a5db30640486bbbfcb and fixed in 7.1.5 with commit 63a30015199912bd5055bead8001b1ae68a67cdb Issue introduced in 7.0 with commit 1c428b03840094410c5fb6a5db30640486bbbfcb and fixed in 7.2-rc1 with commit 8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff Issue introduced in 6.12.94 with commit 4236c30b437b80f673b9e08c8fae38b8d471ac9e Issue introduced in 6.18.23 with commit 0f451b43c88bf2b9c038b414be580efee42e031b Issue introduced in 6.19.13 with commit 5002beda5cac69d522dc54da0d5d463ed9c963d2 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-2026-72463 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/ipv4/xfrm4_input.c net/ipv6/xfrm6_input.c net/xfrm/xfrm_input.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/63a30015199912bd5055bead8001b1ae68a67cdb https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff