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 B1BD9489FA4 for ; Fri, 25 Sep 2026 10:32:50 +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=1790332371; cv=none; b=DMZ74WZ5XlzJNJxy6L0TSH8Dsyh5RgEyTUuzx25fko3DwPrGe8XZOIeDfMKTUJscDKSkkyT7Fdwyr5djoMhBUz/shabmZRY6lLDEt9OAciYsE944HDpGxbsJx8fT8egOIlvWPOOvwn8IV52faFz26L+3CkVVUmj+cxxP134Wqog= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790332371; c=relaxed/simple; bh=bcSO2m5/wOqKKoU8rtVgluqavzKFKBriox6hSGhhFTo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=sKZEbsnmHocF+ArkcvStEVbyuMMZRvf0rykWo1BMl11I8zYwqBuuJkG+vBUhX8VT9Sq2Vh3yhW4n3iP1mRcXB057LpGTaWzEOXpdpR+jVNOzStZOcZCwXCe40C0T25dqAa3QDS5KklDp+sN4yGQU8tlXpT5EPteG8Flg/oLmWoI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=s09L5jSo; 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="s09L5jSo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 16C531F000FF; Fri, 25 Sep 2026 10:32:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790332370; bh=VsAwGkVFILnAt3QUPZYZ60hvvH9hnP58wEvecfAH7Ho=; h=From:To:Cc:Subject:Date:Reply-To; b=s09L5jSoUqZGSpZR5OuaSXM6ENbWjfIEidLvNymZc3cbZA68Zbj5yAy3mRcn9HRYa EusV9cTqbq2kprtckck+hofQTt9IiqrDWXxu6DeDFuJ58t0s0FZfR1jm0oGYS3H4lU ADeE8pfEPmmDUl09jOSKEahKz7fdQi1c8IftBNnE= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98014: net/mlx5: E-Switch, prevent mc_list repopulation during vport disable Date: Fri, 25 Sep 2026 12:25:16 +0200 Message-ID: <2026092525-CVE-2026-98014-a458@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=4286; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=d5OnMwwaEztlWORrGR0MFZNTuIkPVapb5Bw+34PaQYw=; b=owGbwMvMwCRo6H6F97bub03G02pJDFnbvBNdpFdP5wz7vNtk4h75yPxWvd7QPb01R2oeKK/jK rvL8OZpRywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAExk12GGeXpT/8/irZJWf2l1 bu17n2e/GX9ffMEwv6LpmrM7S8Upx0O2PD/clkQcXN/VCwA= 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: net/mlx5: E-Switch, prevent mc_list repopulation during vport disable In mlx5_esw_vport_disable(), move esw_apply_vport_rx_mode() ahead of esw_vport_change_handle_locked() so vport->allmulti_rule is NULL before the change handler observes it. During FW-fatal recovery the disable runs while dev->state == INTERNAL_ERROR. The promisc query inside esw_update_vport_rx_mode() fails and returns early, leaving vport->allmulti_rule intact, so esw_update_vport_mc_promisc() runs and adds MLX5_ACTION_ADD entries to vport->mc_list whose flow rules are then installed in the FDB by esw_add_mc_addr(). esw_destroy_legacy_table() tears down the FDB with those refs still held, corrupting the sub-tree and leaving dangling flow_rule pointers in vport->mc_list. Two-stage failure on `echo 1 > /sys/bus/pci/devices//reset`: refcount_t: underflow; use-after-free. tree_put_node+0xef/0x110 [mlx5_core] clean_tree+0x44/0xd0 [mlx5_core] (x5) mlx5_fs_core_cleanup+0x57/0x1c0 [mlx5_core] mlx5_unload+0x65/0xd0 [mlx5_core] ... mlx5_health_try_recover BUG: unable to handle page fault for address: 0000000003000055 down_write+0x1c/0x60 mlx5_del_flow_rules+0x33/0x1f0 [mlx5_core] esw_del_mc_addr+0x7b/0x170 [mlx5_core] esw_apply_vport_addr_list+0x56/0xf0 [mlx5_core] esw_vport_change_handle_locked+0x28b/0x310 [mlx5_core] mlx5_esw_vport_enable+0x270/0x4a0 [mlx5_core] ... mlx5_load ... mlx5_health_try_recover esw_apply_vport_rx_mode(false, false) clears vport->allmulti_rule via its local state machine even when the FW del fails. With the rule NULL the !IS_ERR_OR_NULL(allmulti_rule) gate in the change handler closes, no rules are installed during disable, and the reload starts with a clean mc_list. The Linux kernel CVE team has assigned CVE-2026-98014 to this issue. Affected and fixed versions =========================== Issue introduced in 6.3 with commit 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 and fixed in 6.12.111 with commit 69904608e25e8ba58111aadd9210892cf3876201 Issue introduced in 6.3 with commit 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 and fixed in 6.18.53 with commit 72cfcb79026cffb6490f5044153a841d360b0cfc Issue introduced in 6.3 with commit 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 and fixed in 7.2.7 with commit 668e050429c7ca688cf4e7112f97f0cd269d446b Issue introduced in 6.3 with commit 922f56e9a795d6f3dd72d3428ebdd7ee040fa855 and fixed in 7.3-rc3 with commit c0c6f4ba8a37688f7b4d4044898d88f0450d44c2 Issue introduced in 5.10.177 with commit 18cead61e437f4c7898acca0a5f3df12f801d97f Issue introduced in 5.15.105 with commit 4df1f2d36bdc9a368650bf14b9097c555e95f71d Issue introduced in 6.1.22 with commit 63546395a0e6ac264f78f65218086ce6014b4494 Issue introduced in 6.2.9 with commit 6f5780536181d1d0d09a11a1bc92f22e143447e2 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-2026-98014 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/mellanox/mlx5/core/eswitch.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/69904608e25e8ba58111aadd9210892cf3876201 https://git.kernel.org/stable/c/72cfcb79026cffb6490f5044153a841d360b0cfc https://git.kernel.org/stable/c/668e050429c7ca688cf4e7112f97f0cd269d446b https://git.kernel.org/stable/c/c0c6f4ba8a37688f7b4d4044898d88f0450d44c2