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 7B2533C3789 for ; Sat, 22 Aug 2026 15:37:11 +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=1787413033; cv=none; b=Dsdv7sazT2FTodW/5DVwURE1prbaKRV9F3oXoLbbvSFmqqnC0AZhUi9tyrRs1DJ8Pi3V3rYygF8KIRhFw3unPKkgttm7L2Z/g9yYpJhyQf//daQQTJYz/ttensfy5oz9EHgQm/o5frWKe+1+jBTlsI/Pi2ozwwnXamUoJkVnW64= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787413033; c=relaxed/simple; bh=PJB3t4hFyhWIEu+6bCPyO1N2z+XHFAPiUxAL0VznrrA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Xtx0y65EdaGfUmjAh5J59bJ3H4KwFbBXqMADGnIxpWPtjOjQjEpcOmubcd1mTDVhJAKGxur7fF+PLw7qMU+BsB+Um/YCo+gbIQHVluq0yDGlHtfCe/Nq9HqdQX2OIlYTkeeDSys8yvESlARUKfxvfhELX863c4MCW6PS4hGBvfg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gFBvqN//; 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="gFBvqN//" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70A1E1F00A3A; Sat, 22 Aug 2026 15:37:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787413031; bh=ymPdrpJhnldcppjl/z5kp7z7qJtUszCFv5Uv89etEjQ=; h=From:To:Cc:Subject:Date:Reply-To; b=gFBvqN//DCNjPdCnG862qtfa2X+XBEvcCsGQvBd1zmih1wePQv5f6dwsIYisEWf8x VazjWtnQnO72yYPbJS0+9JP+lg9AEQ0GDwUd5ZJcGQR6avzF1z82Ft23nfJamHK8yt j2LP5UwAcmUmfIQA9X+mFzAB/nupfMtoxh2Bdwjo= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-74662: inet: frags: publish queues before arming timer Date: Sat, 22 Aug 2026 17:32:26 +0200 Message-ID: <2026082228-CVE-2026-74662-bad3@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=2816; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=Z97xBPnTbDz7qESomxZE5j3K7Rl/pdJBWr04TNHN9vc=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmdBy6wFAhnRsvzrmecae0SlXsnbqZf9/FfFqH3jaQUX kaHtf3oiGVhEGRikBVTZPmyjefo/opDil6Gtqdh5rAygQxh4OIUgIl4PGOYXzrtweLX2542nv5u FBOw6PfMdWzSaQzzA9t+sWe3b5TYez3hZY2bWQ7njNO+AA== 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: inet: frags: publish queues before arming timer inet_frag_create() arms the fragment queue timer before inserting the queue into the fqdir rhashtable. If the namespace fragment timeout is zero or negative, the timer can run before the queue is published. The timer callback then marks the queue complete, tries to remove a node that is not in the hash table yet, and drops the anticipated hash reference. Creation can subsequently publish the completed queue without restoring that reference, leaving a stale hash node after the caller drops the remaining reference. Publish the queue first and arm the timer while holding the queue lock. This makes timer expiry wait until the queue is visible in the hash table, so inet_frag_kill() can remove the node and balance the hash reference. The Linux kernel CVE team has assigned CVE-2026-74662 to this issue. Affected and fixed versions =========================== Issue introduced in 4.17 with commit 648700f76b03b7e8149d13cc2bdb3355035258a9 and fixed in 6.18.45 with commit 9f904dd3e455750e5d4ec9b2f134835811b85a2f Issue introduced in 4.17 with commit 648700f76b03b7e8149d13cc2bdb3355035258a9 and fixed in 7.1.9 with commit 928128865e43b197e30688dc1bc991592c97edcf Issue introduced in 4.17 with commit 648700f76b03b7e8149d13cc2bdb3355035258a9 and fixed in 7.2 with commit 653d7ddf6cba867777a3d14c4f83ace008c5ad13 Issue introduced in 4.4.174 with commit 493107105843f299662b3b664a83804645564f12 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-2026-74662 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/inet_fragment.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/9f904dd3e455750e5d4ec9b2f134835811b85a2f https://git.kernel.org/stable/c/928128865e43b197e30688dc1bc991592c97edcf https://git.kernel.org/stable/c/653d7ddf6cba867777a3d14c4f83ace008c5ad13