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 973AD217659 for ; Sat, 22 Aug 2026 15:40:00 +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=1787413201; cv=none; b=a7DLawePQiDUFcog8BlseOVf8Zw8URGAzpNsVdUO+ZZqm2TF1fO2W/eqCZhG8RMj6qR48XQ+0/syTICCUpJebCR9IRXkbzWaBJVONhS3gkGls6l9CRT1gxVHiuSbhGTKOHkqiFUet3bAMb/Yb2gMmLuX6Sn0hyWdu6ysesJsY00= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787413201; c=relaxed/simple; bh=bEAX/U1pOCRW9JsKDBXMJPrCFgYhEp1o89tJ/2Lf29c=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=R+X9SaCvJIgzHImDHJpO39OAkK4QJ4Ln6V3Zxt1+2qeCNw5zFsMRpIwpu/iT+leF7J6t1xyjFJvBJ1q0RlBBEDjLVLQqXUQdoGVo1D7ltElio8iqskC1ZOPHLjHmbiBAf2lT+4cudN1GqwjRzI8FPgld62OGngEkAOTAkX3npRU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BpvcNgz2; 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="BpvcNgz2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6AC51F000E9; Sat, 22 Aug 2026 15:39:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787413200; bh=x/OXWGCbi1AmlHohRRE/mIBv/G9Bd2Lk9o/h5CYGcYw=; h=From:To:Cc:Subject:Date:Reply-To; b=BpvcNgz26hvPHKQbegxeR0X4ljnkq7rOxMZFG4Ve6gn8BsrQvPRJNuGjxxCtA9E// NI9K4mz0NeWG91SUbCNDzHK41KbKdfjimj0w6fO6QrTzyFy3WLavdt7nPngFsfwgmm qRBvEyC5xMr94/B7mtNkOfRt33R/3Kj7DSRBtDko= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-74688: sctp: clear control chunk transport if it is being removed Date: Sat, 22 Aug 2026 17:32:52 +0200 Message-ID: <2026082233-CVE-2026-74688-5133@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=3948; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=ZquG0o+5rjXOD1LpmGmnW5yTewWjiTriUEvBLcdeO1w=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmdB66+NZRaGj5B0yjqyr35T086tC2/duST6LfUEqfCn RGPpBQnd8SyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBE5OQY5seczbv10X7vEfaj J41/msQ82HTXUolhrvCnz1KLYlos3/b6L7DaW+S62ZZvDwA= 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: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() caches the destination transport in chunk->transport without taking a reference. When src_out_of_asoc_ok is enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead of being transmitted immediately. If the peer transport is removed while the chunk is still queued, sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing, but only clears cached transport pointers in out_chunk_list. The queued control chunk therefore retains a dangling transport pointer. Once an ASCONF_ACK clears the suppression and the queued control chunk is transmitted, SCTP dereferences the stale transport pointer, leading to a use-after-free. Fix this by also clearing chunk->transport for queued control chunks in control_chunk_list when removing the transport. The Linux kernel CVE team has assigned CVE-2026-74688 to this issue. Affected and fixed versions =========================== Issue introduced in 3.1 with commit 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and fixed in 5.10.265 with commit dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 Issue introduced in 3.1 with commit 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and fixed in 5.15.216 with commit fad4766a74220fe579c6fcaa10ba01c23529814f Issue introduced in 3.1 with commit 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and fixed in 6.1.183 with commit 936658ec41c28c397ef390140e02d4c91ade92f0 Issue introduced in 3.1 with commit 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and fixed in 6.6.152 with commit 8de65194a04d2552cd39b6c67d942d490f22d174 Issue introduced in 3.1 with commit 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and fixed in 6.12.104 with commit 6160e756db81d6cb63e3e2952efcf6c5134be385 Issue introduced in 3.1 with commit 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and fixed in 6.18.45 with commit 18d704bdd809377dfd81a3c2f42426763b5da227 Issue introduced in 3.1 with commit 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and fixed in 7.1.9 with commit 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 Issue introduced in 3.1 with commit 8a07eb0a50aebc8c95478d49c28c7f8419a26cef and fixed in 7.2 with commit c9158ceaf27780ef64534ad72f44ffde3f8ccc49 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-2026-74688 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/sctp/associola.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/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0 https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174 https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385 https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227 https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49