CVE-2024-50041: i40e: Fix macvlan leak by synchronizing access to mac_filter_hash
First published: Mon Oct 21 2024(Updated: )
In 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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.15.54<5.15.168 | |
| Linux Linux kernel | >=5.18.11<5.19 | |
| Linux Linux kernel | >=5.19<6.1.113 | |
| Linux Linux kernel | >=6.2<6.6.57 | |
| Linux Linux kernel | >=6.7<6.11.4 | |
| Linux Linux kernel | =6.12-rc1 | |
| Linux Linux kernel | =6.12-rc2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/703c4d820b31bcadf465288d5746c53445f02a55
- https://git.kernel.org/stable/c/8831abff1bd5b6bc8224f0c0671f46fbd702b5b2
- https://git.kernel.org/stable/c/9a9747288ba0a9ad4f5c9877f18dd245770ad64e
- https://git.kernel.org/stable/c/9db6ce9e2738b05a3672aff4d42169cf3bb5a3e3
- https://git.kernel.org/stable/c/dac6c7b3d33756d6ce09f00a96ea2ecd79fae9fb
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50041
- https://nvd.nist.gov/vuln/detail/CVE-2024-50041
- https://launchpad.net/bugs/cve/CVE-2024-50041
- https://security-tracker.debian.org/tracker/CVE-2024-50041
- https://ubuntu.com/security/CVE-2024-50041
- https://git.kernel.org/linus/dac6c7b3d33756d6ce09f00a96ea2ecd79fae9fb
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