GHSA-9748-W7HV-7H34
Vulnerability from github – Published: 2024-10-21 21:30 – Updated: 2025-11-04 00:31In the Linux kernel, the following vulnerability has been resolved:
i40e: Fix macvlan leak by synchronizing access to mac_filter_hash
This patch addresses a macvlan leak issue in the i40e driver caused by concurrent access to vsi->mac_filter_hash. The leak occurs when multiple threads attempt to modify the mac_filter_hash simultaneously, leading to inconsistent state and potential memory leaks.
To fix this, we now wrap the calls to i40e_del_mac_filter() and zeroing vf->default_lan_addr.addr with spin_lock/unlock_bh(&vsi->mac_filter_hash_lock), ensuring atomic operations and preventing concurrent access.
Additionally, we add lockdep_assert_held(&vsi->mac_filter_hash_lock) in i40e_add_mac_filter() to help catch similar issues in the future.
Reproduction steps: 1. Spawn VFs and configure port vlan on them. 2. Trigger concurrent macvlan operations (e.g., adding and deleting portvlan and/or mac filters). 3. Observe the potential memory leak and inconsistent state in the mac_filter_hash.
This synchronization ensures the integrity of the mac_filter_hash and prevents the described leak.
{
"affected": [],
"aliases": [
"CVE-2024-50041"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-10-21T20:15:17Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni40e: Fix macvlan leak by synchronizing access to mac_filter_hash\n\nThis patch addresses a macvlan leak issue in the i40e driver caused by\nconcurrent access to vsi-\u003emac_filter_hash. The leak occurs when multiple\nthreads attempt to modify the mac_filter_hash simultaneously, leading to\ninconsistent state and potential memory leaks.\n\nTo fix this, we now wrap the calls to i40e_del_mac_filter() and zeroing\nvf-\u003edefault_lan_addr.addr with spin_lock/unlock_bh(\u0026vsi-\u003emac_filter_hash_lock),\nensuring atomic operations and preventing concurrent access.\n\nAdditionally, we add lockdep_assert_held(\u0026vsi-\u003emac_filter_hash_lock) in\ni40e_add_mac_filter() to help catch similar issues in the future.\n\nReproduction steps:\n1. Spawn VFs and configure port vlan on them.\n2. Trigger concurrent macvlan operations (e.g., adding and deleting\n\tportvlan and/or mac filters).\n3. Observe the potential memory leak and inconsistent state in the\n\tmac_filter_hash.\n\nThis synchronization ensures the integrity of the mac_filter_hash and prevents\nthe described leak.",
"id": "GHSA-9748-w7hv-7h34",
"modified": "2025-11-04T00:31:45Z",
"published": "2024-10-21T21:30:53Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50041"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/703c4d820b31bcadf465288d5746c53445f02a55"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8831abff1bd5b6bc8224f0c0671f46fbd702b5b2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9a9747288ba0a9ad4f5c9877f18dd245770ad64e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9db6ce9e2738b05a3672aff4d42169cf3bb5a3e3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dac6c7b3d33756d6ce09f00a96ea2ecd79fae9fb"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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