CVE-2026-98359 is a vulnerability in Linux Kernel
Published on October 6, 2026
RDMA/core: Reject unregistering netdevs in ib_get_eth_speed
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.
Products Associated with CVE-2026-98359
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Affected Versions
Linux:- Version d41861942fc55c14b6280d9568a0d0112037f065 and below be4b44c8b47c67a04c08b1a0aba18006b749ae6a is affected.
- Version d41861942fc55c14b6280d9568a0d0112037f065 and below 45c60ffc79771bad154f224a05753191cf1b37bc is affected.
- Version d41861942fc55c14b6280d9568a0d0112037f065 and below 520cd057f138ed8dbe8e05f0eae3a8ed4c5d3a5e is affected.
- Version d41861942fc55c14b6280d9568a0d0112037f065 and below a219459fbd1b2598e63c81a52847eba6c28b72d2 is affected.
- Version d41861942fc55c14b6280d9568a0d0112037f065 and below 5bd42f74ec3b4f4687fb600f367af0828d513b3c is affected.
- Version d41861942fc55c14b6280d9568a0d0112037f065 and below ef9fbe1b93f3b617b96e86d5cd76b3fa44514cb5 is affected.
- Version 4.14 is affected.
- Before 4.14 is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.54, <= 6.18.* is unaffected.
- Version 7.2.8, <= 7.2.* is unaffected.
- Version 7.3-rc4, <= * is unaffected.