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 734CC320A14 for ; Wed, 24 Jun 2026 07:15:19 +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=1782285320; cv=none; b=m6OBlQt3Z2KHTwDJzRJARLnx/Oy0lpCYSyrTnv9V4GJ80O5+bgLw3WkoWb+03Z1lXzA2IKuC95kNFMjJi7Bx85MuyA4DHhPxR97gRoUZajcAsCCECjOKVe2y76GJ+UH36yCFHHyEsdy+Q+Nl2CDiXiow8mjVYR+DhWAlihTXLyk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782285320; c=relaxed/simple; bh=bZgWmrYixklHr2wRZ2SysIc3Pf3/dxSjDfRLwdfFz8o=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Uk+ryyhS9Ak3fDAIwEckbEb7eEy+6bm03TbvOJsTjzLFuOVoqceUBOkN1ddARFGKAPJ4B09iatXbSDykdMgLv3zwxhR9Wnd/w7RcEcr0KtF+NfCutxs7CQ4J5N0i9lJ+38GFC1kpecXFDcAnEQBZJa0RLgLkXRlKy8EqSFcEpWs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MIcddJ3M; 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="MIcddJ3M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 763D31F00A3F; Wed, 24 Jun 2026 07:15:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1782285319; bh=WCcZISs6RpNYFq4pNg4UxT4f16F/gEehi6wmkksrhOI=; h=From:To:Cc:Subject:Date:Reply-To; b=MIcddJ3Mfq2Zo18g1HLrh3cTxOhLzQwuOUyPZd5ixrpZgWQnubzZh8pQ205dxf4og jZd5I5piB9vfbAzIK4bl1jL2j6nhCjVmRBuez4aE+DP51qc0WVmXjBIcghtIHtHxCb HJlgiNw8Ae+QLOnxCotU+nKwQVdB5Elbxvr9ZeUg= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-52929: sctp: stream: fully roll back denied add-stream state Date: Wed, 24 Jun 2026 09:13:44 +0200 Message-ID: <2026062432-CVE-2026-52929-63ee@gregkh> X-Mailer: git-send-email 2.54.0 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=3741; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=sT8ZpTvoZeQXaFNzbFnmdYcvFvcVu6J9LN+y32wbvdc=; b=owGbwMvMwCRo6H6F97bub03G02pJDFnWzXN8tzsk+WuHpggf5goL3fHpyo4bs1hCuN2c/tX9X rLxTYxTRywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAEzkwkqGBQu117J/djJUZfJO 018ZW9apI7h3KcNckeeMWye0v/1vG3iE9aebshen2J5wAA== 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: stream: fully roll back denied add-stream state When ADD_OUT_STREAMS is denied, SCTP only shrinks the queued chunks and then lowers outcnt. That leaves removed stream metadata behind, so a later re-add can reuse a stale ext and hit a null-pointer dereference in the scheduler get path. Fix the rollback by tearing down the removed stream state the same way other stream resizes do. Unschedule the current scheduler state, drop the removed stream ext state with sctp_stream_outq_migrate(), and then reschedule the remaining streams. This keeps scheduler-private RR/FC/PRIO lists consistent while fully rolling back denied outgoing stream additions. The Linux kernel CVE team has assigned CVE-2026-52929 to this issue. Affected and fixed versions =========================== Issue introduced in 4.15 with commit 637784ade221a3c8a7ecd0f583eddd95d6276b9a and fixed in 5.10.259 with commit 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 Issue introduced in 4.15 with commit 637784ade221a3c8a7ecd0f583eddd95d6276b9a and fixed in 5.15.210 with commit a6724b7b812ac8793514a1d5938db5d9d29ae725 Issue introduced in 4.15 with commit 637784ade221a3c8a7ecd0f583eddd95d6276b9a and fixed in 6.1.176 with commit 9662eb0401518f0b4681f10e7fbf688f504f24cf Issue introduced in 4.15 with commit 637784ade221a3c8a7ecd0f583eddd95d6276b9a and fixed in 6.6.143 with commit 7dd9a42b044aad2dbe037db1c1e2943582485b44 Issue introduced in 4.15 with commit 637784ade221a3c8a7ecd0f583eddd95d6276b9a and fixed in 6.12.94 with commit 39dc2b0eb5371a669ebc9ec6072b9184eac95418 Issue introduced in 4.15 with commit 637784ade221a3c8a7ecd0f583eddd95d6276b9a and fixed in 6.18.36 with commit d5ea0b3e261fcb2cfff142675516165244cab1da Issue introduced in 4.15 with commit 637784ade221a3c8a7ecd0f583eddd95d6276b9a and fixed in 7.0.13 with commit 1c6773b8c081509dcd5cd2954f2b02c50c00f151 Issue introduced in 4.15 with commit 637784ade221a3c8a7ecd0f583eddd95d6276b9a and fixed in 7.1 with commit a5f8a90ac9f77c678a9781c0a464b635e0d63e49 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-2026-52929 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/stream.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/0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 https://git.kernel.org/stable/c/a6724b7b812ac8793514a1d5938db5d9d29ae725 https://git.kernel.org/stable/c/9662eb0401518f0b4681f10e7fbf688f504f24cf https://git.kernel.org/stable/c/7dd9a42b044aad2dbe037db1c1e2943582485b44 https://git.kernel.org/stable/c/39dc2b0eb5371a669ebc9ec6072b9184eac95418 https://git.kernel.org/stable/c/d5ea0b3e261fcb2cfff142675516165244cab1da https://git.kernel.org/stable/c/1c6773b8c081509dcd5cd2954f2b02c50c00f151 https://git.kernel.org/stable/c/a5f8a90ac9f77c678a9781c0a464b635e0d63e49