Bugzilla – Bug 1223151
VUL-0: CVE-2024-26910: kernel: netfilter: ipset: fix performance regression in swap operation
Last modified: 2024-04-19 14:02:23 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