Bug 1227102 (CVE-2024-39293)

Summary:	VUL-0: CVE-2024-39293: kernel: revert "xsk: support redirect to any socket bound to the same umem"
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED INVALID	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	camila.matos, mhocko
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/412088/
Whiteboard:	CVSSv3.1:SUSE:CVE-2024-39293:5.5:(AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-06-26 16:21:01 UTC

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.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-39293
https://www.cve.org/CVERecord?id=CVE-2024-39293
https://git.kernel.org/stable/c/19cb40b1064566ea09538289bfcf5bc7ecb9b6f5
https://git.kernel.org/stable/c/7fcf26b315bbb728036da0862de6b335da83dff2
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-39293.mbox
https://bugzilla.redhat.com/show_bug.cgi?id=2294272