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 59FB93BED5F for ; Mon, 10 Aug 2026 12:10:09 +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=1786363810; cv=none; b=Gs9JcxnHb8YIDtvTKCqFCQ5ynkvhJGYUSf5/AwWlRhcgh5HtNiL0K3YhrVBud8db4bs3pxHuIP9ViUqYXXDD07mQpLjzxYIw2o/JIYIK0QFaQD/bfQP8UQlD0ECJ8gPnjeeu57EhD1KhTm+5ufFJ4+rkHoGAdUouqVCWjd7R9r4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786363810; c=relaxed/simple; bh=h8vp4itw+zNeDkPdGA7lSCXGsETyqijhcK3yRyfuRgg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=X7MZ2EhKiQ5IBLAiQxmx/m1KU5mn/1IHDMEBy/mXrMWjDIo2YPz+dJAfoKpm+tmR+hwbnHRSVHayQcAj1CRQKoIjobqNaRYVGSFf59BA2xFp65qImJUy+Dv+EnabHU8HveG9GR6qqVYO7/HJ4XDM+w4FaLLTYqHyxDrTy72ERFk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=DUBSEh0M; 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="DUBSEh0M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D22681F000E9; Mon, 10 Aug 2026 12:10:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786363809; bh=bn82CwAHNM+OB9XOMWFz58DLatfV6yq87qmCm4OKzyc=; h=From:To:Cc:Subject:Date:Reply-To; b=DUBSEh0M3L/yDxsdUpjfYwpvEs2r3kPX5Uvmx4BUxOz3mROiNqlqlVxSFKh3nypaZ uQ0sd8VhAHFlaLt558xgEAZniesSZeQNQxZVu944huhyytlggrF4PNOVDhoNqZg86N 5P2MKYR/LoY+TMUNAzruIG72u2iY0dn6HEtDm+qM= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-68312: cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths Date: Mon, 10 Aug 2026 14:00:29 +0200 Message-ID: <2026081032-CVE-2026-68312-6ef4@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=2588; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=XVlxp4H/2GD7w35mOIEwpnJEEDwRLJWeofCPYOB9/oY=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmVe9bodWg/OvDRcKtBsqCKDlftzVN5MyrvpnA/f9Mrs c9zulJRRywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAEzksQ/DPHvrS3wiU+t7ckqk 302/cVtPa6b/RoZ5pm7BU/Vc+lM/Kmw98sUl0alirlAHAA== 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: cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths In cifs_close_deferred_file(), cifs_close_all_deferred_files(), and cifs_close_deferred_file_under_dentry(), when a pending deferred close is cancelled via cancel_delayed_work(), the subsequent kmalloc_obj() to add the file to the local processing list may fail under memory pressure. The loop breaks immediately, but the cancelled work is no longer pending (it would have called _cifsFileInfo_put()), and the cfile is never added to file_head for processing. The cifsFileInfo reference and the open server handle both leak. Fix by saving the cfile that failed allocation in a local variable, breaking as before, and calling _cifsFileInfo_put() on it after releasing the lock. Any files later in the iteration are unaffected since their deferred work is still pending and will fire normally. The Linux kernel CVE team has assigned CVE-2026-68312 to this issue. Affected and fixed versions =========================== Issue introduced in 5.15 with commit e3fc065682ebbbd15b0ce0036800f4acbf765d46 and fixed in 7.1.6 with commit 32390b3f06f26e366cfb27dbac4bc0196c321535 Issue introduced in 5.15 with commit e3fc065682ebbbd15b0ce0036800f4acbf765d46 and fixed in 7.2-rc5 with commit c2f2e83e3bbc5483730fd4ee903182761f1ae50f 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-2026-68312 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/smb/client/misc.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/32390b3f06f26e366cfb27dbac4bc0196c321535 https://git.kernel.org/stable/c/c2f2e83e3bbc5483730fd4ee903182761f1ae50f