{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64073",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.031Z",
        "datePublished": "2026-07-19T15:39:48.463Z",
        "dateUpdated": "2026-07-20T13:43:01.595Z"
    },
    "containers": {
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            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-07-20T13:43:01.595Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nirq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT\n\nOn PREEMPT_RT, non-HARD irq_work runs in per-CPU kthreads via\nrun_irq_workd(), so irq_work_sync() uses rcuwait() to wait for BUSY==0.\n\nAfter irq_work_single() clears BUSY via atomic_cmpxchg(), it still\ndereferences @work for irq_work_is_hard() and rcuwait_wake_up().\n\nAn irq_work_sync() caller on another CPU that enters after BUSY is cleared\ncan observe BUSY==0 immediately, return, and free the work before those\naccesses complete — causing a use-after-free.\n\nFix this by wrapping run_irq_workd() in guard(rcu)() so that the entire\nirq_work_single() execution is within an RCU read-side critical\nsection. Then add synchronize_rcu() in irq_work_sync() after\nrcuwait_wait_event() to ensure the caller waits for the RCU grace period\nbefore returning, preventing premature frees."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/irq_work.c"
                    ],
                    "versions": [
                        {
                            "version": "810979682ccc98dbd83f341c18a2e556c30a7164",
                            "lessThan": "2dc79362302922cb18f35e262712b5e58de65442",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "810979682ccc98dbd83f341c18a2e556c30a7164",
                            "lessThan": "eef4f71b46a9929ac33e968538c9dd5d96a02460",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "810979682ccc98dbd83f341c18a2e556c30a7164",
                            "lessThan": "684a78183c54c23e70d1cba320f7fc184604210b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "810979682ccc98dbd83f341c18a2e556c30a7164",
                            "lessThan": "18c0456ea2615b1a743a6db739c74411c3b42bc6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "810979682ccc98dbd83f341c18a2e556c30a7164",
                            "lessThan": "81b582784518196eff1050212a046bc29d3a05dd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "810979682ccc98dbd83f341c18a2e556c30a7164",
                            "lessThan": "91840be8f710370607f949a627e070896faeddb8",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/irq_work.c"
                    ],
                    "versions": [
                        {
                            "version": "5.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.175",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.142",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.92",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.34",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.11",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/2dc79362302922cb18f35e262712b5e58de65442"
                },
                {
                    "url": "https://git.kernel.org/stable/c/eef4f71b46a9929ac33e968538c9dd5d96a02460"
                },
                {
                    "url": "https://git.kernel.org/stable/c/684a78183c54c23e70d1cba320f7fc184604210b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/18c0456ea2615b1a743a6db739c74411c3b42bc6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/81b582784518196eff1050212a046bc29d3a05dd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/91840be8f710370607f949a627e070896faeddb8"
                }
            ],
            "title": "irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT",
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