{"id":"CLSA-2025-1754037492","summary":"Fix CVE(s): CVE-2025-21760, CVE-2025-21761, CVE-2025-21762, CVE-2025-21764","details":"   [ Ubuntu: 4.15.0-250.261 ]\n   * Focal update: v5.4.291 upstream stable release (LP: #2106002) //\n     CVE-2025-21760 // CVE-url: https://ubuntu.com/security/CVE-2025-21760\n     - ndisc: extend RCU protection in ndisc_send_skb()\n   * Focal update: v5.4.291 upstream stable release (LP: #2106002) //\n     CVE-2025-21761 // CVE-url: https://ubuntu.com/security/CVE-2025-21761\n     - openvswitch: use RCU protection in ovs_vport_cmd_fill_info()\n   * Focal update: v5.4.291 upstream stable release (LP: #2106002) //\n     CVE-2025-21764 // CVE-url: https://ubuntu.com/security/CVE-2025-21764\n     - ndisc: use RCU protection in ndisc_alloc_skb()\n   * Focal update: v5.4.291 upstream stable release (LP: #2106002) //\n     CVE-2025-21765 // CVE-url: https://ubuntu.com/security/CVE-2025-21764\n     - ipv6: use RCU protection in ip6_default_advmss()\n   * Focal update: v5.4.291 upstream stable release (LP: #2106002) // CVE-url:\n     https://ubuntu.com/security/CVE-2025-21764\n     - ipv4: use RCU protection in rt_is_expired()\n     - ipv4: use RCU protection in inet_select_addr()\n   * CVE-url: https://ubuntu.com/security/CVE-2025-21762\n     - net: treat possible_net_t net pointer as an RCU one and add read_pnet_rcu()\n     - net: add dev_net_rcu() helper\n     - arp: use RCU protection in arp_xmit()","modified":"2026-10-26T09:32:00.771007207Z","published":"2026-10-21T18:10:52Z","upstream":["CVE-2025-21760","CVE-2025-21761","CVE-2025-21762","CVE-2025-21764","CVE-2025-21765"],"references":[{"type":"ADVISORY","url":"https://errata.tuxcare.com/els_os/ubuntu16.04els/CLSA-2025-1754037492.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21760"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21761"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21762"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21764"}],"affected":[{"package":{"name":"linux-buildinfo-4.15.0-250-tuxcare.els48-generic","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-buildinfo-4.15.0-250-tuxcare.els48-generic?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-buildinfo-4.15.0-250-tuxcare.els48-lowlatency","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-buildinfo-4.15.0-250-tuxcare.els48-lowlatency?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-cloud-tools-4.15.0-250-tuxcare.els48-generic","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-cloud-tools-4.15.0-250-tuxcare.els48-generic?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-cloud-tools-4.15.0-250-tuxcare.els48-lowlatency","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-cloud-tools-4.15.0-250-tuxcare.els48-lowlatency?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-headers-4.15.0-250-tuxcare.els48","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-headers-4.15.0-250-tuxcare.els48?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-headers-4.15.0-250-tuxcare.els48-generic","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-headers-4.15.0-250-tuxcare.els48-generic?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-headers-4.15.0-250-tuxcare.els48-lowlatency","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-headers-4.15.0-250-tuxcare.els48-lowlatency?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-hwe-cloud-tools-4.15.0-250-tuxcare.els48","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-hwe-cloud-tools-4.15.0-250-tuxcare.els48?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-hwe-tools-4.15.0-250-tuxcare.els48","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-hwe-tools-4.15.0-250-tuxcare.els48?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-image-unsigned-4.15.0-250-tuxcare.els48-generic","ecosystem":"TuxCare:Ubuntu:16.04","purl":"pkg:deb/tuxcare/linux-image-unsigned-4.15.0-250-tuxcare.els48-generic?distro=ubuntu-16.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-250.261~16.04.1"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2025-1754037492.json"}},{"package":{"name":"linux-ima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