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 9A75C415B8D for ; Fri, 11 Sep 2026 20:00:16 +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=1789156826; cv=none; b=t+fpILv/n3+PP208EDvXlXuxThq3oMVRabxcWtnzok1Dr2KGe6MfXkWsWmRFRnJmXSDXILDFCSPoQmztPGf3YW4nYKRjfPn4c1Umz0xsnvseCAGisNZMS94FAV0Doz9h2Qgi2ghQuSOlrTEPG4o9UPK7YOh0jAeA8G7Nw2/wPX4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789156826; c=relaxed/simple; bh=sZwmTgdr3pBvWXQEUG3ewjJ2Abh3MNiqG5F7oajwqHs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=BC4Jo4SzkWvMnrGumXbLBDPKbHZB+kIR9bKmnvcu4SsaxbqhfX5BkdEvGHj7UJFY/dJjiDmFGVyfjSMgpFR7AWHOm7eRpYtoVA0BEJUt40IAwPaf2mwB/vWDx35J46TkxRASIh19oKBwoaqROB4GL8theByJAEn9Vzc6Ze7qGgk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cHubFkxX; 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="cHubFkxX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F54F1F00899; Fri, 11 Sep 2026 20:00:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789156816; bh=289AzzjaA72QFgiiW+xZIqLg7GLAK8WtpV6W3djoiac=; h=From:To:Cc:Subject:Date:Reply-To; b=cHubFkxXKXlwgVt0BLbaFjvBd4A9r9jH1vlMlp8ulsMwWD4xKVqd+02dE4GmLcqZF 2KhThQ8ntK+Ftxujam3iRGfs+UGUFuH5tXXZ3qtks2zzYm2m/b4kq6I4NKZzItppoo swLETQazvMTsPF/cvc3PsG6OMqvMabe/+F+JhAfI= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89643: audit: avoid dropping live tree ref on fsnotify rule autoremove Date: Fri, 11 Sep 2026 21:45:32 +0200 Message-ID: <2026091142-CVE-2026-89643-d95f@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=3134; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=cWTiZOpLfdSF71dWHjA6sKXOYMbqHM/bst8XQnb5X+o=; b=kA0DAAIRMUfUDdst+ykByyZiAGqkWXbIKjKcERgxJDeo7QP9gDi0hDXs3gtscXtXPb3lVTjaS IhdBAARAgAdFiEE9LYMxb94wiFKMT3LMUfUDdst+ykFAmqkWXYACgkQMUfUDdst+ynmQwCgiyrN cTRffh8TxapghG1yuMZM48MAoJX1fet3myO+QEoQ7IHlmFGuGvCu 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: audit: avoid dropping live tree ref on fsnotify rule autoremove audit_del_rule() is used for both netlink deletion templates and internal fsnotify autoremove. The former passes a parsed template which owns a temporary tree reference; the latter passes the installed entry itself. The unconditional audit_put_tree() at the end of audit_del_rule() assumes the template case. For mixed AUDIT_DIR plus AUDIT_EXE rules, an fsnotify autoremove event therefore drops the installed rule's live tree reference. Repeating this across rules sharing the same tree can free the tree while another rule still references it, and a later autoremove dereferences the freed pathname while comparing rules. Move the temporary-tree put to audit_rule_change(), the caller that owns deletion templates. Keep it in the AUDIT_DEL_RULE cleanup so both successful deletion and -ENOENT still release the parser-owned tree. [PM: dropped unnecessary comment for line length reasons] The Linux kernel CVE team has assigned CVE-2026-89643 to this issue. Affected and fixed versions =========================== Issue introduced in 4.3 with commit 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and fixed in 6.12.109 with commit cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28 Issue introduced in 4.3 with commit 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and fixed in 6.18.50 with commit 636a99bab36ba27515363d325866c0273ac83b3e Issue introduced in 4.3 with commit 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and fixed in 7.2.4 with commit 583cf579b32d99e3fe4e9c8ecc4d852e3708fbec Issue introduced in 4.3 with commit 34d99af52ad40bd498ba66970579a5bc1fb1a3bc and fixed in 7.3-rc1 with commit 783f0f0974c156aca630f4ffff248671082a098d 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-2026-89643 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: kernel/auditfilter.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/cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28 https://git.kernel.org/stable/c/636a99bab36ba27515363d325866c0273ac83b3e https://git.kernel.org/stable/c/583cf579b32d99e3fe4e9c8ecc4d852e3708fbec https://git.kernel.org/stable/c/783f0f0974c156aca630f4ffff248671082a098d