CVE-2024-38544
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
A seg fault in rxe_comp_queue_pkt() in the RDMA rxe subsystem of the Linux kernel was found. An incoming response packet is enqueued and then dereferenced after deciding to run the completer task, which can lead to accessing freed memory.
Risk Assessment
This can lead to system crashes, especially at high scale RDMA usage.
Recommendation
Install a Linux kernel update containing the fix that changes the order: access the counter first, then enqueue the packet.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt In rxe_comp_queue_pkt() an incoming response packet skb is enqueued to the resp_pkts queue and then a decision is made whether to run the completer task inline or schedule it. Finally the skb is dereferenced to bump a 'hw' performance counter. This is wrong because if the completer task is already running in a separate thread it may have already processed the skb and freed it which can cause a seg fault. This has been observed infrequently in testing at high scale. This patch fixes this by changing the order of enqueuing the packet until after the counter is accessed.