CVE-2024-38544 Affecting kernel-rt-core package, versions <0:5.14.0-427.33.1.el9_4

Note: Versions mentioned in the description apply only to the upstream kernel-rt-core package and not the kernel-rt-core package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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.

• https://errata.almalinux.org/9/ALSA-2024-5928.html
• https://access.redhat.com/security/cve/CVE-2024-38544
• https://access.redhat.com/errata/RHSA-2024:5928
• https://git.kernel.org/stable/c/de5a059e36657442b5637cc16df5163e435b9cb4
• https://git.kernel.org/stable/c/e0e14dd35d4242340c7346aac60c7ff8fbf87ffc
• https://git.kernel.org/stable/c/c91fb72a2ca6480d8d77262eef52dc5b178463a3
• https://git.kernel.org/stable/c/21b4c6d4d89030fd4657a8e7c8110fd941049794
• https://git.kernel.org/stable/c/2b23b6097303ed0ba5f4bc036a1c07b6027af5c6
• https://git.kernel.org/stable/c/30df4bef8b8e183333e9b6e9d4509d552c7da6eb
• https://git.kernel.org/stable/c/bbad88f111a1829f366c189aa48e7e58e57553fc
• https://git.kernel.org/stable/c/faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19