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 6C6F246E005 for ; Fri, 4 Sep 2026 15:20:13 +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=1788535214; cv=none; b=kW1ERnXgtn+WicHqb1wMd9LBaikxAJekTR/TIiXBByf4Q9OD2qYB5P0DJJgcwDR8Qyqvq1+rg701M8+xjWAgfBuu3FwnSZRJxTRSnWfuHbya619GtvkM18R41B7KdResCSVwtl6wml+v/3Gm8x4W6FL9fkLCfsWU1f0s1WY090c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788535214; c=relaxed/simple; bh=0uoCLDQYmr3o0hu9QgG30/4nvme8sYmqq9ZVs15AeHM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Ei9dyqSGCGJw0XtYxXn4coNJuMM1uuDYWKV6ID3i5FGScM/GnPQVZOhc44KsGuVDA3K1Sr4+kzlHRsLC3w8u1V1VoJ3J4JmlE9AT34RuveS5pOpSsThIjrR6FZ+eKq1QfardeeQzWJr2aixyTu5G0ISriiO5GNlrW/xhXq3W0H4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OZRLTCGD; 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="OZRLTCGD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 085ED1F00A3D; Fri, 4 Sep 2026 15:20:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788535213; bh=8pPMUPujoziTUgCbSPFqPvHtaok2e8bqOwLP3H5oEz8=; h=From:To:Cc:Subject:Date:Reply-To; b=OZRLTCGDB87CapyWKtyEA8dhCIuwYfdibN5HAj/6oqN9i8us6qfFkHINkL+hoxY/V PMzCbPqz6Vdk0ToEQxIfsnMlwtMr8/j/hkdfs4+bNtOvT9eHvBZZwrA1WRvu7DOI00 h3jTNq8k6u8TcULtxDHMBefx2jBI/luCPvWSTnVE= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80795: nfc: nci: fix out-of-bounds write in nci_target_auto_activated() Date: Fri, 4 Sep 2026 17:11:34 +0200 Message-ID: <2026090407-CVE-2026-80795-b431@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=4847; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=SMz14eHFOgR0o0cmbr9S56DZrEa9as0RrsuGK+x0KZA=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmz7ndPSorO/PVuCaP3RmOlPXe87/Xp614rmX25N/FwU uZ/HYMlHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCR+ZIMc0XdtJnfWCxOyZKZ ce97yV/Hj/1RzgzzgzRaVWxy3CU3VmxVCik8Jy0zj/kbAA== 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: nfc: nci: fix out-of-bounds write in nci_target_auto_activated() nci_target_auto_activated() appends a target to the fixed-size array ndev->targets[NCI_MAX_DISCOVERED_TARGETS] and increments ndev->n_targets without first checking the array is full; unlike its sibling nci_add_new_target(), which bails out when n_targets already equals NCI_MAX_DISCOVERED_TARGETS. ndev->n_targets is only cleared by nci_clear_target_list(), so an NFCC that repeatedly re-runs discovery (RF_DISCOVER_RSP, which re-enters NCI_DISCOVERY without clearing the target list) and reports an auto-activated target (RF_INTF_ACTIVATED_NTF) drives n_targets past the limit. The append then writes a struct nfc_target past the end of the array (a slab out-of-bounds write), and nfc_targets_found() goes on to walk the array with the inflated count: BUG: KASAN: slab-out-of-bounds in nci_add_new_protocol+0x94/0x2ac [nci] Write of size 2 at addr ffff0000c7299a18 by task kworker/u8:0/12 Workqueue: nfc0_nci_rx_wq nci_rx_work [nci] Call trace: nci_add_new_protocol+0x94/0x2ac [nci] nci_ntf_packet+0xddc/0x11a0 [nci] nci_rx_work+0x15c/0x1e0 [nci] process_one_work+0x2dc/0x500 worker_thread+0x240/0x460 kthread+0x1c0/0x1d0 ret_from_fork+0x10/0x20 The buggy address belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1024 bytes to the right of allocated 1560-byte region [ffff0000c7299000, ffff0000c7299618) Guard nci_target_auto_activated() with the same check used by nci_add_new_target(). The Linux kernel CVE team has assigned CVE-2026-80795 to this issue. Affected and fixed versions =========================== Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 5.10.267 with commit 0dc59de0075f88404a0f4a2b5233104ef459fbb2 Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 5.15.218 with commit 94530ffabfca57e9bff1d207106010014cc84032 Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 6.1.185 with commit afd8605fb43becb892311102844955c3b127fc7e Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 6.6.154 with commit 24761d3a5f692df5f7d848caeabcb2afd10917aa Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 6.12.106 with commit 50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951 Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 6.18.47 with commit 2f08dbce3b37624ec6b424d759336a99586170ec Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 7.1.11 with commit d7083f41c21b30582e91b2e6de4d54dce74f6f9c Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 7.2.1 with commit 129032c0616d83a5e3e304f6ebf88f14ba01e5f7 Issue introduced in 3.4 with commit 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 and fixed in 7.3-rc1 with commit ac200079db50af81e6b04d058b33ec92901d8edd 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-2026-80795 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: net/nfc/nci/ntf.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/0dc59de0075f88404a0f4a2b5233104ef459fbb2 https://git.kernel.org/stable/c/94530ffabfca57e9bff1d207106010014cc84032 https://git.kernel.org/stable/c/afd8605fb43becb892311102844955c3b127fc7e https://git.kernel.org/stable/c/24761d3a5f692df5f7d848caeabcb2afd10917aa https://git.kernel.org/stable/c/50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951 https://git.kernel.org/stable/c/2f08dbce3b37624ec6b424d759336a99586170ec https://git.kernel.org/stable/c/d7083f41c21b30582e91b2e6de4d54dce74f6f9c https://git.kernel.org/stable/c/129032c0616d83a5e3e304f6ebf88f14ba01e5f7 https://git.kernel.org/stable/c/ac200079db50af81e6b04d058b33ec92901d8edd