CVE-2024-50041: i40e: Fix macvlan leak by synchronizing access to mac_filter_hash
In the Linux kernel, the following vulnerability has been resolved:
i40e: Fix macvlan leak by synchronizing access to macfilterhash
This patch addresses a macvlan leak issue in the i40e driver caused by concurrent access to vsi->macfilterhash. The leak occurs when multiple threads attempt to modify the macfilterhash simultaneously, leading to inconsistent state and potential memory leaks.
To fix this, we now wrap the calls to i40edelmacfilter() and zeroing vf->defaultlanaddr.addr with spinlock/unlockbh(&vsi->macfilterhashlock), ensuring atomic operations and preventing concurrent access.
Additionally, we add lockdepassertheld(&vsi->macfilterhashlock) in i40eaddmacfilter() 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 macfilterhash.
This synchronization ensures the integrity of the macfilterhash and prevents the described leak.
Other sources
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— Launchpad
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1 - Upgrade
Upgrade
debian/linux-6.1to a version that resolves this vulnerability.Fixed in 6.1.129-1~deb11u1 - Configuration
Wrap calls to i40e_del_mac_filter() and zeroing vf->default_lan_addr.addr with spin_lock/unlock_bh(&vsi->mac_filter_hash_lock) to synchronize access to vsi->mac_filter_hash and prevent concurrent modification (macvlan leak).
Linux kernel i40e driver vsi->mac_filter_hash synchronization = spin_lock/unlock_bh(&vsi->mac_filter_hash_lock) - Configuration
Add lockdep_assert_held(&vsi->mac_filter_hash_lock) in i40e_add_mac_filter() to catch similar synchronization issues in the future.
Linux kernel i40e driver lockdep_assert_held in i40e_add_mac_filter() = lockdep_assert_held(&vsi->mac_filter_hash_lock)
Event History
Frequently Asked Questions
What is the severity of CVE-2024-50041?
CVE-2024-50041 is classified as a medium severity vulnerability.
How do I fix CVE-2024-50041?
To resolve CVE-2024-50041, update your Linux kernel to a version that includes the relevant patch.
Which versions of the Linux kernel are affected by CVE-2024-50041?
CVE-2024-50041 affects Linux kernel versions between 5.15.54 and 6.11.4, as well as certain release candidates.
What type of vulnerability is CVE-2024-50041?
CVE-2024-50041 is a macvlan leak vulnerability due to concurrent access issues in the i40e driver.
Who is impacted by CVE-2024-50041?
Users of affected Linux kernel versions running the i40e driver may be impacted by CVE-2024-50041.