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 032E03DEAE0 for ; Tue, 6 Oct 2026 10:25:38 +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=1791282339; cv=none; b=aiMrpvX9nBugf+Wbavnb1JnF4Su3SAECcZccHCwuAJBw+hSfY3aTOEP9LrYmlWoGmUoKwoYvFJg7pewc1EKpq3rgo+GJakPRCLezmGRXnaQRXm0yOXnd2pAyHzjjP3PqLh9V6xMdhdpuDoYc5/AR0LM9VpyVU31kgd6XAiFTayM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791282339; c=relaxed/simple; bh=RAEFMh5JzXWaAaI0ueXBjsp261nhzpz+yfiKpmpxm4s=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=svLLjZk9VyyZIk9cqC2OSTPT3ES4QInAhsjHZsB9zGNdW4ipgaoENVNF4aHFltk7nMhPjCPr6fa+0LNS7F3UXl2l1HgWPo/sMT45BMWkCZAHxpiGY3sLcZmJxcBd19+G84PMFKrF2orZDPS64ocye2BG4ukMGSaST2S1/Z3ZA2U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wpzfBEPa; 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="wpzfBEPa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 590F91F000FF; Tue, 6 Oct 2026 10:25:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1791282337; bh=43gkZpmLavRTBLXoaRm2mxSVNyoVHLgyiCKVwXm6z94=; h=From:To:Cc:Subject:Date:Reply-To; b=wpzfBEPai4QAhRJxyiGg7r1WSaEkJtHVK0d8wrczqU+jAEU7ln3uCTCMLFAM3+q/R 5eeCnLfkWB/1/+pa0qTDYhftUYpmPQaI2wwaYiyR90zRd9TcLb80oa4G8bmC52pr3C j2Tw6aaU2BSeqxqw4P1MyzQgpMa16BuYxHhMSmVE= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98277: eth: fbnic: ring the doorbell if a burst ends in a drop Date: Tue, 6 Oct 2026 10:46:18 +0200 Message-ID: <2026100604-CVE-2026-98277-e761@gregkh> X-Mailer: git-send-email 2.56.0 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=2979; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=VFHFGVCC9HO6vB9TIWnrm38lGSzHnmLYEnnmBK96GDw=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlHtgqo6KobK017ZpBWpXXjSdyPldx/LDN25LpL8XwI/ 2+3UetNRywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAExkdS3DfOeSlt9PHu/aGXTh gkBowpK2qH0hWQzzi8//zFv1u2/lj7gWqewlV0tZc4KPAgA= 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: eth: fbnic: ring the doorbell if a burst ends in a drop fbnic_tx_map() skips the doorbell write, and the completion request, for every packet handed to it with xmit_more set, counting on the packet which ends the burst to publish them all. When that packet is dropped instead - skb_put_padto(), skb_cow_head() or a DMA mapping failure - nothing rings. The descriptors of the preceding packets stay invisible to the HW until the next transmit on that queue, which for a burst-then-idle workload may never come. Remember the meta descriptor of the last packet left without a doorbell and flush it from the error paths. The completion request has to be set on that descriptor rather than simply writing the tail, otherwise the HW would transmit the packets but never report a head, and the ring would fill up and stall for good. This is very similar to Joe's recent series of fixes for bnxt. Not seen in real life, reproduced under QEMU with failure injection. The Linux kernel CVE team has assigned CVE-2026-98277 to this issue. Affected and fixed versions =========================== Issue introduced in 6.11 with commit 9a57bacd574b52b08bc2c600af6a8c7a87049ecf and fixed in 6.18.54 with commit 60ef74357a36ed2a102a75bb68d37aa7f305b94e Issue introduced in 6.11 with commit 9a57bacd574b52b08bc2c600af6a8c7a87049ecf and fixed in 7.2.8 with commit 28fb764d670aa22dcbd2a02fd8fd87ae8d3563a9 Issue introduced in 6.11 with commit 9a57bacd574b52b08bc2c600af6a8c7a87049ecf and fixed in 7.3-rc4 with commit 490599ab23134962a6d18a024e84541d77bdb999 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-2026-98277 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: drivers/net/ethernet/meta/fbnic/fbnic_txrx.c drivers/net/ethernet/meta/fbnic/fbnic_txrx.h 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/60ef74357a36ed2a102a75bb68d37aa7f305b94e https://git.kernel.org/stable/c/28fb764d670aa22dcbd2a02fd8fd87ae8d3563a9 https://git.kernel.org/stable/c/490599ab23134962a6d18a024e84541d77bdb999