{"id":"CVE-2026-68286","summary":"drop_monitor: perform u64_stats updates under IRQ-disabled section","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: perform u64_stats updates under IRQ-disabled section\n\nIn net_dm_packet_trace_kfree_skb_hit() and net_dm_hw_trap_packet_probe(),\nu64_stats_update_begin() / u64_stats_inc() / u64_stats_update_end() were\ncalled after spin_unlock_irqrestore(&...drop_queue.lock, flags), when local\nIRQs had already been re-enabled.\n\nTracepoint probes can execute in IRQ or softirq context. On 32-bit\narchitectures, u64_stats_update_begin() disables preemption but not interrupts,\nrelying on seqcount writes. If a nested interrupt occurs on the same CPU during\nthe 64-bit stats update, the reentrant seqcount update can corrupt the\nseqcount state or stats value.\n\nFix this by performing the 64-bit per-CPU stats update before releasing\ndrop_queue.lock via spin_unlock_irqrestore(), ensuring local interrupts remain\ndisabled during the u64_stats update.","modified":"2026-08-18T03:30:59.004152982Z","published":"2026-08-10T12:02:19.077Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68286.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/d5e2cd2bc8ae36617346b3a54ee9da61d866bf92"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd098a23bf8fda7eae48db9b06e7c34fc4d228fa"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68286.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68286"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e9feb58020f952f7d9de785ede9a7d54ab1eda5c"},{"fixed":"d5e2cd2bc8ae36617346b3a54ee9da61d866bf92"},{"fixed":"fd098a23bf8fda7eae48db9b06e7c34fc4d228fa"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68286.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.4.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68286.json"}}],"schema_version":"1.9.0"}