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 DEB445867E5 for ; Fri, 11 Sep 2026 19:56:29 +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=1789156592; cv=none; b=fSOQI55Q5Y/zwTNeq/ukakYZSDAz3SDXfIJc+zFHqU+++h5u5xavjER8lmBQGVVxb69PfA6nLk094lQnNfVtjU6EB/7otVTMmNH4wmVdlo/HPxe9U4CcFIHT9UYIT/RMOYlhgrML2cCmq3Ud+nWc1JehTeb0lnYrHZ1wstUKi0o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789156592; c=relaxed/simple; bh=KqU6eaZWeR9fEjAfrG7qGGaW+nXa3BfsXQODvWZ7MOM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=UivXTaZ8f9AosvY9UVwhZ/3AT1CXyEUW80PAucy24feypk6i1iljzOU9k5Hntyb/2vpXe4ZD318D+JqhFp7R5wmj/tJ4AqFu95i2Oyf55ZAbBw2KiWXPjCmd+SuvuHjWlLSuLiqrMJo+Je7VWoKLwzglHRNNT8IyAeOZRcYxCL4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=IuLGOEHH; 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="IuLGOEHH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1154A1F0089C; Fri, 11 Sep 2026 19:56:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789156586; bh=zt1pMzNfmViOVIuVBXc8oFTAKmlzVP+xkraiDMExHOI=; h=From:To:Cc:Subject:Date:Reply-To; b=IuLGOEHHBjYFXIy9Eti0ZJKZ45fiLA4ctz/Ri8IBBAUnFFGgWpgKDzkOTPF8WvQGF IOEGAqbMgzymtHU2T7O8IWAJVkVJqqP0xIBIoIpLpSiumgu2V1gqBYSpEUQWZ+idYU +iNItzDfo/MrDiw9DE9sfOyxs0xfwHtgwcxlCUeY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89567: jbd2: bound shrinker scans by examined checkpoint buffers Date: Fri, 11 Sep 2026 21:44:16 +0200 Message-ID: <2026091125-CVE-2026-89567-dfb2@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=3292; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=FtvepFFj6F1Ei7T6bIRsvu5ypa2ALAyJw39V3QNTBnE=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlLIlPnTnWbciZgysKDf6cZKna8+FZUqlKqoHN31+4Dr OzMdme1O2JZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAiz6IZ5ke9jbnrqePoofJ7 koWk0vsTrwOOBjIs2MFkN6n7kPGr3WteFkpLf3n8L/PwUwA= 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: jbd2: bound shrinker scans by examined checkpoint buffers The jbd2 shrinker currently accounts only checkpoint buffers that it successfully releases against nr_to_scan. Busy buffers therefore do not consume the scan budget. If a checkpoint transaction contains mostly busy buffers, the shrinker can scan its entire checkpoint list while holding journal->j_list_lock. Large checkpoint lists can result in excessive lock hold times and leave other CPUs spinning on j_list_lock, causing soft lockups or RCU stalls. Pass nr_to_scan into journal_shrink_one_cp_list() and decrement it for every buffer examined, including busy buffers. Pass NULL from checkpoint cleanup paths so their existing full-list behavior is preserved. This restores the scan-budget semantics that existed before journal_shrink_one_cp_list() was changed to always scan a complete checkpoint list. The Linux kernel CVE team has assigned CVE-2026-89567 to this issue. Affected and fixed versions =========================== Issue introduced in 6.5 with commit b98dba273a0e47dbfade89c9af73c5b012a4eabb and fixed in 6.12.109 with commit edf5fcd0469b7467bd5b37a79502c8d9c3257dbb Issue introduced in 6.5 with commit b98dba273a0e47dbfade89c9af73c5b012a4eabb and fixed in 6.18.50 with commit 71c6b872c746465fa4b5def239cb296173ca8216 Issue introduced in 6.5 with commit b98dba273a0e47dbfade89c9af73c5b012a4eabb and fixed in 7.2.4 with commit c2c0fb364685b8996c357d3b050394959b29d6e0 Issue introduced in 6.5 with commit b98dba273a0e47dbfade89c9af73c5b012a4eabb and fixed in 7.3-rc1 with commit 15cb16496446b94e67f7abcb049b8e2c75cd3d02 Issue introduced in 5.15.129 with commit 9c31bb2684f8035beca0275349d19d679b679ffb Issue introduced in 6.1.50 with commit 5fda50e262e65bd553ff777c4b280afd1495a18b Issue introduced in 6.4.13 with commit 557fda9ed70ebf8eda2620ba3d746215285a1303 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-2026-89567 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: fs/jbd2/checkpoint.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/edf5fcd0469b7467bd5b37a79502c8d9c3257dbb https://git.kernel.org/stable/c/71c6b872c746465fa4b5def239cb296173ca8216 https://git.kernel.org/stable/c/c2c0fb364685b8996c357d3b050394959b29d6e0 https://git.kernel.org/stable/c/15cb16496446b94e67f7abcb049b8e2c75cd3d02