Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Reject unregistering netdevs in ib_get_eth_speed ib_device_get_netdev() intentionally returns a referenced net_device even when it is unregistering, so matching and cleanup callers can still find the association. The reference keeps struct net_device allocated, but does not guarantee that the device remains operational. ib_get_eth_speed() uses the returned device operationally by invoking its ethtool callback. Although that call is made under RTNL, the function does not verify the registration state first. An asynchronous RDMA port query can therefore call into a netdev after NETDEV_UNREGISTER and ndo_uninit have completed. Check for NETREG_REGISTERED while holding RTNL and return -ENODEV for a device which is being unregistered. Keeping RTNL across the check and the ethtool operation prevents unregister from starting between them. Keep the speed fallback and warning under RTNL as well, so the warning can safely read netdev->name. Drop the netdev reference before releasing RTNL once all accesses to the device are complete.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d41861942fc55c14b6280d9568a0d0112037f065 to < be4b44c8b47c67a04c08b1a0aba18006b749ae6aaffectedd41861942fc55c14b6280d9568a0d0112037f065 to < 45c60ffc79771bad154f224a05753191cf1b37bcaffectedd41861942fc55c14b6280d9568a0d0112037f065 to < 520cd057f138ed8dbe8e05f0eae3a8ed4c5d3a5eaffectedd41861942fc55c14b6280d9568a0d0112037f065 to < a219459fbd1b2598e63c81a52847eba6c28b72d2affectedd41861942fc55c14b6280d9568a0d0112037f065 to < 5bd42f74ec3b4f4687fb600f367af0828d513b3caffectedd41861942fc55c14b6280d9568a0d0112037f065 to < ef9fbe1b93f3b617b96e86d5cd76b3fa44514cb5affected
Linux Linux
Default version status: affected
4.14affected0 to < 4.14unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.54 to ≤ 6.18.*unaffected7.2.8 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/be4b44c8b47c67a04c08b1a0aba18006b749ae6a ↗
- https://git.kernel.org/stable/c/45c60ffc79771bad154f224a05753191cf1b37bc ↗
- https://git.kernel.org/stable/c/520cd057f138ed8dbe8e05f0eae3a8ed4c5d3a5e ↗
- https://git.kernel.org/stable/c/a219459fbd1b2598e63c81a52847eba6c28b72d2 ↗
- https://git.kernel.org/stable/c/5bd42f74ec3b4f4687fb600f367af0828d513b3c ↗
- https://git.kernel.org/stable/c/ef9fbe1b93f3b617b96e86d5cd76b3fa44514cb5 ↗