by Kastro
Paper/Archive/CVE-2024-39293

CVE-2024-39293

Linux Linux — Revert "xsk: Support redirect to any socket bound to the same umem"

EPSS 0.3%CVSS 9.8
critical.is priorityof 100
34
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 24.4.244 × 204.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

In the Linux kernel, the following vulnerability has been resolved: Revert "xsk: Support redirect to any socket bound to the same umem" This reverts commit 2863d665ea41282379f108e4da6c8a2366ba66db. This patch introduced a potential kernel crash when multiple napi instances redirect to the same AF_XDP socket. By removing the queue_index check, it is possible for multiple napi instances to access the Rx ring at the same time, which will result in a corrupted ring state which can lead to a crash when flushing the rings in __xsk_flush(). This can happen when the linked list of sockets to flush gets corrupted by concurrent accesses. A quick and small fix is not possible, so let us revert this for now.

Affected

ProductAffectedFixed inSource
Linux2863d665ea41282379f108e4da6c8a2366ba66db – < 19cb40b1064566ea09538289bfcf5bc7ecb9b6f519cb40b1064566ea09538289bfcf5bc7ecb9b6f5CNA
Linux2863d665ea41282379f108e4da6c8a2366ba66db – < 7fcf26b315bbb728036da0862de6b335da83dff27fcf26b315bbb728036da0862de6b335da83dff2CNA
Linux6.96.9.5CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgit.kernel.org/stable/c/19cb40b1064566ea09538289bfcf5bc7ecb9b6f5refgit.kernel.org/stable/c/7fcf26b315bbb728036da0862de6b335da83dff2