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 CA71136C5A9 for ; Sat, 15 Aug 2026 06:25:36 +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=1786775137; cv=none; b=lYmiVTEc3PIfAlDPkJ3oj1FskPU9BjiKX7pSN3l9Dg/ANHVBc/76kTw/MNuyR52jZl2gKKDwuac7jEUNzxKK2zyQuYSqMqo1tqLeMFDkqY71YANhGKoxZZhHWWWRYFNI1dNRC8RfLdAkTmL+pTTHxFvN0aGge2rQLfkCkiq+K7w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786775137; c=relaxed/simple; bh=1r5NK+75YmZCkyvk1UEbfhtLICzMJdPhGaj5PVLLYsA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=VtdjuvPioeVvRazoz1OjV/SSdKLsWsekSSR+q77fsBG/rPbDGP0drl4H2jIKY66AScAlv1bnUVWqnuiAA5VJT1JjztwkFhIFmzXDhpqR6MtHhO/1WB2OQA6y+e4n+JeBwUdVyTQrcbTH8klowsLsS53qC5EuQq+2l8LDlC5YSQ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Q3m07u9k; 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="Q3m07u9k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E9BB1F000E9; Sat, 15 Aug 2026 06:25:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786775136; bh=qkeSkB66QTJoro/ReqtMR6kUekJx11Hv3pTJzObgawU=; h=From:To:Cc:Subject:Date:Reply-To; b=Q3m07u9kAPp87ZPkb07NwWfssJD56j5HH5bfTvxCm5bIWBh5xLbv5CISYh4CtkeQ5 Rjz1DiTG7W0UFgcANErVUBwplHn2akQIJeKM/XqHMwBVclVvCWb3uQBfUASOIE7/CX ahmOoG5Body9Ar7S9McFBCmDY+inTppEcAs2ePF0= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72385: tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry() Date: Sat, 15 Aug 2026 15:07:44 +0900 Message-ID: <2026081518-CVE-2026-72385-542c@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=3207; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=Gk0tRYjUocpu72nMWb2sPkZRXRnrVWc/mzf72M/k+fs=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDK92PzqjEXFB6sWii9rv3sb2R81Q1F6m4rF4x6kU1 ZrcwpdfO2JZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAiV7cyLJg1f2Luylh21WoH hfvn075nnH/cxs+wYLvJiu9xhxh9/qaGc7j9WbK71KF+KwA= 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: tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry() fprobe_fgraph_entry() sizes a shadow-stack reservation in one walk of the per-ip fprobe list and fills it in a second walk, both under rcu_read_lock() only. A fprobe registered on an already-live ip can become visible between the two walks, so the fill walk processes an exit_handler the sizing walk did not count and used runs past reserved_words. If the sizing walk counted nothing, fgraph_data is NULL and the first write_fprobe_header() faults: Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:fprobe_fgraph_entry+0xa38/0xf10 kernel/trace/fprobe.c:167 Call Trace: function_graph_enter_regs+0x44c/0xa10 kernel/trace/fgraph.c:677 ftrace_graph_func+0xc5/0x140 arch/x86/kernel/ftrace.c:671 __kernel_text_address+0x9/0x40 kernel/extable.c:78 arch_stack_walk+0x117/0x170 arch/x86/kernel/stacktrace.c:26 kmem_cache_free+0x188/0x580 mm/slub.c:6378 tcp_data_queue+0x18d/0x6550 net/ipv4/tcp_input.c:5590 [...] The list cannot be frozen across the two walks, so skip a node that does not fit the reservation and count it as missed. The Linux kernel CVE team has assigned CVE-2026-72385 to this issue. Affected and fixed versions =========================== Issue introduced in 6.14 with commit 4346ba1604093305a287e08eb465a9c15ba05b80 and fixed in 6.18.40 with commit 62988204162fc382cfc7d9a185d40a751261e3a3 Issue introduced in 6.14 with commit 4346ba1604093305a287e08eb465a9c15ba05b80 and fixed in 7.1.5 with commit d655cca1c6e67eb081214d37eb231a869ead2f97 Issue introduced in 6.14 with commit 4346ba1604093305a287e08eb465a9c15ba05b80 and fixed in 7.2-rc2 with commit 367c49d6e283c17b56a31e7a8d964a079244264c 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-2026-72385 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/trace/fprobe.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/62988204162fc382cfc7d9a185d40a751261e3a3 https://git.kernel.org/stable/c/d655cca1c6e67eb081214d37eb231a869ead2f97 https://git.kernel.org/stable/c/367c49d6e283c17b56a31e7a8d964a079244264c