{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"CRITICAL" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp->state from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp->lock on return. The lock\nis re-acquired after net_info_ratelimited(). A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work. The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n general protection fault: 0000 [#1] SMP NOPTI\n CPU: 4 PID: 217 Comm: kworker/4:1\n Workqueue: ipv6_addrconf addrconf_dad_work\n RIP: 0010:ipv6_del_addr+0xe9/0x280\n RAX: dead000000000122\n Call Trace:\n addrconf_dad_stop+0x113/0x140\n addrconf_dad_work+0x28c/0x430\n process_one_work+0x1eb/0x3b0\n worker_thread+0x4d/0x400\n kthread+0x104/0x140\n ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section. The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74398" }, { "summary":"CVE-2026-74398 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-74398.json" }, { "summary":"openEuler-SA-2026-3704", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3704" }, { "summary":"CVE-2026-74398", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-74398&packageName=kernel" } ], "title":"openEuler cve CVE-2026-74398", "tracking":{ 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The lock\nis re-acquired after net_info_ratelimited(). A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work. The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n general protection fault: 0000 [#1] SMP NOPTI\n CPU: 4 PID: 217 Comm: kworker/4:1\n Workqueue: ipv6_addrconf addrconf_dad_work\n RIP: 0010:ipv6_del_addr+0xe9/0x280\n RAX: dead000000000122\n Call Trace:\n addrconf_dad_stop+0x113/0x140\n addrconf_dad_work+0x28c/0x430\n process_one_work+0x1eb/0x3b0\n worker_thread+0x4d/0x400\n kthread+0x104/0x140\n ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section. The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.29.160.oe2403sp3.src", "openEuler-24.03-LTS-SP3:bpftool-6.6.0-145.3.29.160.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:bpftool-debuginfo-6.6.0-145.3.29.160.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.29.160.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debuginfo-6.6.0-145.3.29.160.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debugsource-6.6.0-145.3.29.160.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-devel-6.6.0-145.3.29.160.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-extra-modules-6.6.0-145.3.29.160.oe2403sp3.aarch64", 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