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 4973243F8CB; Thu, 30 Jul 2026 15:23:47 +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=1785425029; cv=none; b=i2BpEvMkSv4Pq0HCJond9tAGh9XE1HmE13aucQnkSU8XGmAYagDlY9Zu2lhaDWm546kZ+HYedFt4mTnQg2eRo0Wuta6+2h93Pio0LenxiBtUom+wg44ymETPoG9FRXC4Nl1R1vjWJHaC87geU96hNbyBOQHz3ZMfPALzVI6V03w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785425029; c=relaxed/simple; bh=dz7oHnSaFmofzzLSZi+RtGokCuhWoTxXYXDM6sTlLao=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S2U3NjJ6dOaHWwna3gGaJICCrvC/kDwnV/TKsyziXwwCddm+nHCO6kGB/o01FFzb5tM24c7mK0Lhg2bXn4fBj7YErMfHCt3XwogmuP8qAz9qNnxUmCIUAtMQZzF/yxTZuB78X7NU/tZEfX3Dw35m116DXM91pSctWb1nAtNvnwI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=byEBpjQ0; 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="byEBpjQ0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5229B1F000E9; Thu, 30 Jul 2026 15:23:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785425027; bh=89aaQiPdQ8mdNfowAKNidUJ+/VjteS7tJJLVeUh7QkI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=byEBpjQ0mxtV0/fWN6uATazb7IqrCBK3UzNSgJaDbfYDlZlIT+9qAVtYR7TS3U4L+ N5UZYza6DXb2BFtlmZGQMBdjYpp8w0Il/jVupMJ6FQXPwaghEhvqjU/Ml2J6GRCK7o 5tKmAYg7kBVtpV338Rd80+CdZXXX7T+bP019ACw4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Simon Horman , Doruk Tan Ozturk , Jakub Kicinski Subject: [PATCH 6.18 557/675] mac802154: llsec: reject frames shorter than the authentication tag Date: Thu, 30 Jul 2026 16:14:47 +0200 Message-ID: <20260730141456.974491842@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260730141445.110192266@linuxfoundation.org> References: <20260730141445.110192266@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Doruk Tan Ozturk commit fd3a3f28ed60c6af4b2a39933b151d6b27842c3b upstream. llsec_do_decrypt_auth() computes the associated-data length for the AEAD request as assoclen += datalen - authlen; where datalen is the number of bytes after the MAC header and authlen (4, 8 or 16) is the length of the authentication tag. Nothing verifies that the frame actually carries at least authlen payload bytes. A secured frame whose payload is shorter than the tag makes datalen - authlen negative; assoclen is then passed to aead_request_set_ad() as an unsigned value close to 4 GiB, so crypto_aead_decrypt() walks far off the end of the scatterlist that only spans the real frame. The frame is fully attacker-controlled and reaches this path from any IEEE 802.15.4 peer in radio range. Reject frames whose payload is shorter than the authentication tag before the subtraction. Dynamically reproduced on a KASAN kernel as a general-protection-fault in the AEAD scatterwalk, and the fix confirmed. Fixes: 4c14a2fb5d14 ("mac802154: add llsec decryption method") Cc: stable@vger.kernel.org Reviewed-by: Simon Horman Signed-off-by: Doruk Tan Ozturk Link: https://patch.msgid.link/20260716193423.32498-1-doruk@0sec.ai Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/mac802154/llsec.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/net/mac802154/llsec.c +++ b/net/mac802154/llsec.c @@ -891,6 +891,11 @@ llsec_do_decrypt_auth(struct sk_buff *sk data = skb_mac_header(skb) + skb->mac_len; datalen = skb_tail_pointer(skb) - data; + if (datalen < authlen) { + kfree_sensitive(req); + return -EBADMSG; + } + sg_init_one(&sg, skb_mac_header(skb), assoclen + datalen); if (!(hdr->sec.level & IEEE802154_SCF_SECLEVEL_ENC)) {