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 5D2C6361DC0 for ; Sat, 15 Aug 2026 06:16:06 +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=1786774567; cv=none; b=BtGM0xoWUeBNgHf8xzIdbDlRk/CkVZUOs/m2bqgi9D+gSvhCLFL9TDU4Zwmo/DHzex9T+Md5nK4QjPf0vadM919diJl/KWi5+bC+0Izuiyaxs2jTSmeH3s+3n7xT7x3UyDjGLhXRa8sHoFNdl5jKDNstF5U6k0gnX/mb1HuqV+0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786774567; c=relaxed/simple; bh=z/E9erod/ZiNeLmcmhPxaocc1gU3RGo9oAgwErauqiM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=t7Z9LT5uPZJ8vIrBKncSjdXPpIQy0KazVOujNSABdImi6hbxYC4qSDrkZQBkJWoP63FeUxNIBim3vyK6kp4sStVpNV7i9JsKJYIsoO5eavrOolURNOXa77cMRF7NHOO9Z9FW0wTHUP2YZOstndExt+FPOqnKY4qUAzLCf7hx/sQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=js1vMDYe; 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="js1vMDYe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B62321F000E9; Sat, 15 Aug 2026 06:16:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786774566; bh=iSiC3TIaq/hqVDz5tzwE2QySTUKNolGYivyJHsg+8bM=; h=From:To:Cc:Subject:Date:Reply-To; b=js1vMDYe/iR+N7ii7D/EUU1MIGkvQJKGzhF3SNkI9+VF8kKJi/KhFzEc4iOQIJbQo 2eJ9242NWIP+zJ93Ywiwdl1GMWm4yAugXt/2UtWSw+TzbMPkv/Bh9x/SuYhDQfAwVQ kz10FOEal8VANLjPYTaYfL3SMW+SiaPRWuzR0FX4= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72197: fs/ntfs3: bound DeleteIndexEntryAllocation memmove length Date: Sat, 15 Aug 2026 15:04:36 +0900 Message-ID: <2026081543-CVE-2026-72197-95ee@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=4054; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=q4eopwsLhT64eyei7TH/hPByJNRKbcre4u6Xn1liaQ4=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDMeNUgJ40jJDXkcn3HHu1Zn5I17s/ZkNhiliZw6c3 hQR3yLZEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABO5eIdhwULNV09/Lmaz3V50 RjlWk+Xr3qb2GQzzzC99WFpzRvReAA//tU+7t5QkXI3YAwA= 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: fs/ntfs3: bound DeleteIndexEntryAllocation memmove length In do_action()'s DeleteIndexEntryAllocation case, e->size comes from an on-disk INDEX_BUFFER entry. When e->size makes e + e->size point past hdr + hdr->used, PtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t that is silently cast to a quasi-infinite size_t when passed to memmove(). The memmove then walks past the destination buffer. The sibling DeleteIndexEntryRoot case at fslog.c:3540-3543 already carries the corresponding guard: if (PtrOffset(e1, Add2Ptr(hdr, used)) < esize || Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) || used + esize > le32_to_cpu(hdr->total)) { goto dirty_vol; } Apply the same shape to the allocation-path case. Also reject esize == 0: memmove(e, e, ...) is a no-op and leaves hdr->used unchanged, hiding a malformed entry from the existing check_index_header() walk. Reproduced under UML+KASAN on mainline 8d90b09e6741 by mounting a crafted NTFS image: the unguarded memmove takes a length of 0xffffffffffffff00 and the kernel oopses in memmove+0x81/0x1a0 on the do_action+0x36a2 frame. [almaz.alexandrovich@paragon-software.com: clang-formatted the changes] The Linux kernel CVE team has assigned CVE-2026-72197 to this issue. Affected and fixed versions =========================== Issue introduced in 5.15 with commit b46acd6a6a627d876898e1c84d3f84902264b445 and fixed in 5.15.212 with commit c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959 Issue introduced in 5.15 with commit b46acd6a6a627d876898e1c84d3f84902264b445 and fixed in 6.1.178 with commit b509b9613f20dc5b653d54bf78fab00d79cc43c8 Issue introduced in 5.15 with commit b46acd6a6a627d876898e1c84d3f84902264b445 and fixed in 6.6.145 with commit 4c8aac931c1cd70347961ba5157aa916448c6a25 Issue introduced in 5.15 with commit b46acd6a6a627d876898e1c84d3f84902264b445 and fixed in 6.12.97 with commit f383aae59ec3994c14804f4191c59038b206be81 Issue introduced in 5.15 with commit b46acd6a6a627d876898e1c84d3f84902264b445 and fixed in 6.18.40 with commit 09fddd52c1b0cef2c086d61be8f3d5dc92e36565 Issue introduced in 5.15 with commit b46acd6a6a627d876898e1c84d3f84902264b445 and fixed in 7.1.5 with commit 554700c65d398276cb00a8ef95f1d5e00b9eff93 Issue introduced in 5.15 with commit b46acd6a6a627d876898e1c84d3f84902264b445 and fixed in 7.2-rc1 with commit fc4626bb3656362de8b0ecd56605d47a19ec3518 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-2026-72197 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/ntfs3/fslog.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/c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959 https://git.kernel.org/stable/c/b509b9613f20dc5b653d54bf78fab00d79cc43c8 https://git.kernel.org/stable/c/4c8aac931c1cd70347961ba5157aa916448c6a25 https://git.kernel.org/stable/c/f383aae59ec3994c14804f4191c59038b206be81 https://git.kernel.org/stable/c/09fddd52c1b0cef2c086d61be8f3d5dc92e36565 https://git.kernel.org/stable/c/554700c65d398276cb00a8ef95f1d5e00b9eff93 https://git.kernel.org/stable/c/fc4626bb3656362de8b0ecd56605d47a19ec3518