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CVE-2024-44989 is a NULL-pointer dereference in the Linux kernel bonding driver's interaction with XFRM/IPsec device offload. During active-slave changes, the driver can clear real_dev while packets remain in transit. XFRM can concurrently invoke xdo_dev_offload_ok(), whose callbacks assume that real_dev remains valid. This race can cause a kernel page fault; the demonstrated call chain includes nsim_ipsec_offload_ok(), bond_ipsec_offload_ok(), and xfrm_output(). The corrective change prevents real_dev from being set to NULL in the affected operation.
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A Linux kernel bonding flaw allows a null pointer dereference when real_dev is cleared while packets remain in transit and XFRM offload callbacks execute concurrently. It can cause a kernel crash and denial of service. The advisory assigns CVSS v3 severity of 5.5, indicating local access, low privileges, and high availability impact.
Linux kernel bonding/XFRM real-device null-pointer dereference.
Linux kernel bonding/XFRM real-device NULL-pointer dereference.
Linux kernel bonding driver NULL-pointer dereference in XFRM real-device handling.
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