CVE-2022-49234 (GCVE-0-2022-49234)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:55 – Updated: 2026-08-05 08:54
VLAI
Title
net: dsa: Avoid cross-chip syncing of VLAN filtering
Summary
In the Linux kernel, the following vulnerability has been resolved: net: dsa: Avoid cross-chip syncing of VLAN filtering Changes to VLAN filtering are not applicable to cross-chip notifications. On a system like this: .-----. .-----. .-----. | sw1 +---+ sw2 +---+ sw3 | '-1-2-' '-1-2-' '-1-2-' Before this change, upon sw1p1 leaving a bridge, a call to dsa_port_vlan_filtering would also be made to sw2p1 and sw3p1. In this scenario: .---------. .-----. .-----. | sw1 +---+ sw2 +---+ sw3 | '-1-2-3-4-' '-1-2-' '-1-2-' When sw1p4 would leave a bridge, dsa_port_vlan_filtering would be called for sw2 and sw3 with a non-existing port - leading to array out-of-bounds accesses and crashes on mv88e6xxx.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6638 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d371b7c92d190448f3ccbf082c90bf929285f648 , < e1f2a4dd8d433eec393d09273a78a3d3551339cf (git)
Affected: d371b7c92d190448f3ccbf082c90bf929285f648 , < 108dc8741c203e9d6ce4e973367f1bac20c7192b (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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              "value": "AV:L - Exploitation requires local netlink/ioctl bridge configuration (enslave a DSA user port then leave the bridge); the buggy path is not reachable from remote packet processing.\nAC:L - On a multi-chip DSA fabric with unequal port counts (the severe but realistic deployment), an attacker who can configure bridges can reliably trigger the OOB by enabling vlan_filtering, joining a high-indexed port, then removing it\u2014no conditions outside attacker control.\nPR:L - Triggering requires CAP_NET_ADMIN to manipulate bridge membership of DSA ports; per kernel CNA guidance that capability is treated as Low when obtainable in a user/network namespace that holds those ports, not full init-namespace root beyond that.\nUI:N - The attacker performs the bridge join/leave operations themselves; no separate victim action is required.\nS:U - Impact is confined to the host kernel/DSA subsystem; this is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - The bug is an out-of-bounds access on the dsa_switch flexible ports array (and related structures), which reads past the allocation and can disclose adjacent kernel memory.\nI:H - For drivers without vlan_filtering_is_global (including mv88e6xxx), dsa_port_vlan_filtering writes dp-\u003evlan_filtering through the OOB port pointer, producing an out-of-bounds write exploitable for memory corruption.\nA:H - The same OOB/NULL path causes kernel oops/crashes on mv88e6xxx and peer switches when a non-existent port index is used, fully disrupting system availability."
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    "dateReserved": "2025-02-26T01:49:39.294Z",
    "dateUpdated": "2026-08-05T08:54:26.338Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: Avoid cross-chip syncing of VLAN filtering\n\nChanges to VLAN filtering are not applicable to cross-chip\nnotifications.\n\nOn a system like this:\n\n.-----.   .-----.   .-----.\n| sw1 +---+ sw2 +---+ sw3 |\n\u0027-1-2-\u0027   \u0027-1-2-\u0027   \u0027-1-2-\u0027\n\nBefore this change, upon sw1p1 leaving a bridge, a call to\ndsa_port_vlan_filtering would also be made to sw2p1 and sw3p1.\n\nIn this scenario:\n\n.---------.   .-----.   .-----.\n|   sw1   +---+ sw2 +---+ sw3 |\n\u0027-1-2-3-4-\u0027   \u0027-1-2-\u0027   \u0027-1-2-\u0027\n\nWhen sw1p4 would leave a bridge, dsa_port_vlan_filtering would be\ncalled for sw2 and sw3 with a non-existing port - leading to array\nout-of-bounds accesses and crashes on mv88e6xxx."
          },
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: dsa: Evitar la sincronizaci\u00f3n entre chips del filtrado de VLAN Los cambios en el filtrado de VLAN no son aplicables a las notificaciones entre chips. En un sistema como este: .-----. .-----. .-----. | sw1 +---+ sw2 +---+ sw3 | \u0027-1-2-\u0027 \u0027-1-2-\u0027 \u0027-1-2-\u0027 Antes de este cambio, al salir sw1p1 de un puente, tambi\u00e9n se realizaba una llamada a dsa_port_vlan_filtering a sw2p1 y sw3p1. En este escenario: .---------. .-----. .-----. | sw1 +---+ sw2 +---+ sw3 | \u0027-1-2-3-4-\u0027 \u0027-1-2-\u0027 \u0027-1-2-\u0027 Cuando sw1p4 abandonara un puente, se llamar\u00eda a dsa_port_vlan_filtering para sw2 y sw3 con un puerto inexistente, lo que provocar\u00eda accesos fuera de los l\u00edmites de la matriz y fallos en mv88e6xxx."
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}



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