Bug 1223151 (CVE-2024-26910)

Summary: VUL-0: CVE-2024-26910: kernel: netfilter: ipset: fix performance regression in swap operation
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: RESOLVED FIXED QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P5 - None CC: gianluca.gabrielli
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/402448/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-26910:5.5:(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 2024-04-19 14:01:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netfilter: ipset: fix performance regression in swap operation

The patch "netfilter: ipset: fix race condition between swap/destroy
and kernel side add/del/test", commit 28628fa9 fixes a race condition.
But the synchronize_rcu() added to the swap function unnecessarily slows
it down: it can safely be moved to destroy and use call_rcu() instead.

Eric Dumazet pointed out that simply calling the destroy functions as
rcu callback does not work: sets with timeout use garbage collectors
which need cancelling at destroy which can wait. Therefore the destroy
functions are split into two: cancelling garbage collectors safely at
executing the command received by netlink and moving the remaining
part only into the rcu callback.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-26910
https://www.cve.org/CVERecord?id=CVE-2024-26910
https://git.kernel.org/stable/c/653bc5e6d9995d7d5f497c665b321875a626161c
https://git.kernel.org/stable/c/970709a67696b100a57b33af1a3d75fc34b747eb
https://git.kernel.org/stable/c/97f7cf1cd80eeed3b7c808b7c12463295c751001
https://git.kernel.org/stable/c/a24d5f2ac8ef702a58e55ec276aad29b4bd97e05
https://git.kernel.org/stable/c/b93a6756a01f4fd2f329a39216f9824c56a66397
https://git.kernel.org/stable/c/c2dc077d8f722a1c73a24e674f925602ee5ece49
https://git.kernel.org/stable/c/c7f2733e5011bfd136f1ca93497394d43aa76225
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-26910.mbox
https://bugzilla.redhat.com/show_bug.cgi?id=2275773