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 4549239FCC8 for ; Fri, 4 Sep 2026 17:14:13 +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=1788542054; cv=none; b=q5rTqqn1XamEXvjBEHqx5UlqJHoc6mW/VqE44Hg9r3zBBcwlT1BOg9mkXMUR+uHpnoNIfGYcXfm1yXpyYOZQ/1FNkHjoOZOToduUntuINF8nFkYOOyOymeW8q1j1Igc6cisSMbPqcAP37Zs3cydIJZ5/h7/6L5rcqDyFdo0GDdE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788542054; c=relaxed/simple; bh=iP9YGjoQbIOyVcVaJI1QRRLT1ilRLrfahwm8yTlLenQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=UaEsYqCr777jmtjoGtGh9lgodII3HekpiQxfFwWnVvB8zjqV3e4R2qbp6p+//GXhleHE5F3h9e/OnLIsXXwEQY3UeusxQFsxcUz23U0OB/fUjemJOY1m8XaOTX8WVB8i71h3PlZPM7x/FsW0iouCvaUooFdiAwX0ccsITqoHN2k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dUSb7Glt; 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="dUSb7Glt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4876C1F00A3D; Fri, 4 Sep 2026 17:14:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788542053; bh=AS8D9ov9lCGXDUlVveyyc+AcfIr3tj0E4zRWog8bePc=; h=From:To:Cc:Subject:Date:Reply-To; b=dUSb7GltSU3eztgIKF3Vpz1gFr0o82ZGmY/WDdK73uAuBrF9H0sG/slQbac0KlS7l t5bDNCe3Gf9dXXz8k8LCeHTeZ051fDQyW5DbueUxdDvFun+ZC6FVflEmu3DHcuStvl f3tJ5XQ6RFXYtXNmYVmhHpyoGRveruu7Vo5RwM88= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80890: sctp: reject stale cookies with mismatched verification tags Date: Fri, 4 Sep 2026 19:09:31 +0200 Message-ID: <2026090429-CVE-2026-80890-0d3d@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=3984; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=4Zkk14lr+s/T8UR8ubgt8l/7uJNd8n5cWbTuodaz0Kc=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmzfns+efNz6/PaRx+Cgi/cuKJamGjYurlrFvNslZgHT F03HEOmdcSyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBEnI4xzNOyfxvXfLLL5yND nfuV2l0bbJOtfBnmu8anBEnUnc/awhr09ZK/xQ5W/4spAA== 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: reject stale cookies with mismatched verification tags sctp_unpack_cookie() skips cookie expiration checks whenever an association already exists. This is broader than the exception in RFC 9260 Section 5.2.4. For an existing association, Section 5.2.4 permits an expired State Cookie only when both Verification Tags in the cookie match the current association. Otherwise, the packet SHOULD be discarded and a Stale Cookie ERROR MUST be sent. The broad check lets an expired Action A restart cookie reach sctp_sf_do_dupcook_a(). In a runtime test with the default 60 second cookie lifetime, replaying such a cookie after 65 seconds returned a COOKIE-ACK and restarted the association. Check cookie expiration unless both Verification Tags match. This preserves the Action D exception for a lost COOKIE ACK while rejecting expired cookies in all other cases. The Linux kernel CVE team has assigned CVE-2026-80890 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.265 with commit f6e3cc296372accad4ee57405195021231ef4bcb Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.216 with commit c151daba0ceb1fb068a215b07de89fb1eb5f87bc Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.183 with commit 817cffdbdbdf50e1f2b016599d1897de3ca54964 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.151 with commit 61baa5020b0afb41bfd97f8f6ce5e336c4a4546e Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.103 with commit c68557a49e960dbcdede22c7a9b488603078b8b4 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.18.44 with commit a0d1693923f41d6f49083aa2446686aed09d1d79 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.1.8 with commit 35c279113498d19a8734e2aae67b951b9b20f634 Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.2 with commit 9d8da8e0a9bce4a340af60dd0446bc7eb8d07587 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-2026-80890 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/sm_make_chunk.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/f6e3cc296372accad4ee57405195021231ef4bcb https://git.kernel.org/stable/c/c151daba0ceb1fb068a215b07de89fb1eb5f87bc https://git.kernel.org/stable/c/817cffdbdbdf50e1f2b016599d1897de3ca54964 https://git.kernel.org/stable/c/61baa5020b0afb41bfd97f8f6ce5e336c4a4546e https://git.kernel.org/stable/c/c68557a49e960dbcdede22c7a9b488603078b8b4 https://git.kernel.org/stable/c/a0d1693923f41d6f49083aa2446686aed09d1d79 https://git.kernel.org/stable/c/35c279113498d19a8734e2aae67b951b9b20f634 https://git.kernel.org/stable/c/9d8da8e0a9bce4a340af60dd0446bc7eb8d07587