Description

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.

Classification

CVE ID: CVE-2024-38544

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 15.23% (scored less or equal to compared to others)

EPSS Date: 2025-02-03 (when was this score calculated)

References

https://git.kernel.org/stable/c/c91fb72a2ca6480d8d77262eef52dc5b178463a3
https://git.kernel.org/stable/c/de5a059e36657442b5637cc16df5163e435b9cb4
https://git.kernel.org/stable/c/e0e14dd35d4242340c7346aac60c7ff8fbf87ffc
https://git.kernel.org/stable/c/faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19
https://git.kernel.org/stable/c/21b4c6d4d89030fd4657a8e7c8110fd941049794
https://git.kernel.org/stable/c/bbad88f111a1829f366c189aa48e7e58e57553fc
https://git.kernel.org/stable/c/30df4bef8b8e183333e9b6e9d4509d552c7da6eb
https://git.kernel.org/stable/c/2b23b6097303ed0ba5f4bc036a1c07b6027af5c6

Timeline