CVE-2026-68286

drop_monitor: perform u64_stats updates under IRQ-disabled section

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-68286

Published

In the Linux kernel, the following vulnerability has been resolved: drop_monitor: perform u64_stats updates under IRQ-disabled section In net_dm_packet_trace_kfree_skb_hit() and net_dm_hw_trap_packet_probe(), u64_stats_update_begin() / u64_stats_inc() / u64_stats_update_end() were called after spin_unlock_irqrestore(&...drop_queue.lock, flags), when local IRQs had already been re-enabled. Tracepoint probes can execute in IRQ or softirq context. On 32-bit architectures, u64_stats_update_begin() disables preemption but not interrupts, relying on seqcount writes. If a nested interrupt occurs on the same CPU during the 64-bit stats update, the reentrant seqcount update can corrupt the seqcount state or stats value. Fix this by performing the 64-bit per-CPU stats update before releasing drop_queue.lock via spin_unlock_irqrestore(), ensuring local interrupts remain disabled during the u64_stats update.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-68286

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/core/drop_monitor.c"
                    ],
                    "versions": [
                        {
                            "version": "e9feb58020f952f7d9de785ede9a7d54ab1eda5c",
                            "lessThan": "dd8472526a04f2185afd792b8041a912a7d75d85",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e9feb58020f952f7d9de785ede9a7d54ab1eda5c",
                            "lessThan": "3454c729ee8aa682ec871f1b174b047f731933ae",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e9feb58020f952f7d9de785ede9a7d54ab1eda5c",
                            "lessThan": "be9b121894d6ad44f0011f79543a2e3245979497",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e9feb58020f952f7d9de785ede9a7d54ab1eda5c",
                            "lessThan": "7d857cf5f0120bb0e020fa20b03bd21b9d3e0c04",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e9feb58020f952f7d9de785ede9a7d54ab1eda5c",
                            "lessThan": "d5e2cd2bc8ae36617346b3a54ee9da61d866bf92",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e9feb58020f952f7d9de785ede9a7d54ab1eda5c",
                            "lessThan": "fd098a23bf8fda7eae48db9b06e7c34fc4d228fa",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/core/drop_monitor.c"
                    ],
                    "versions": [
                        {
                            "version": "5.4",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.4",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.6",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON