CVE-2026-64073

{"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": "2026-10-19T20:28:11.133Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:54.369Z"}, "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 \u2014 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"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires reaching irq_work_sync() teardown paths via local syscalls (e.g. perf_event_open/close, bpf map teardown) that queue non-HARD irq_work on PREEMPT_RT; there is no direct network packet or remote-protocol entry point into irq_work.c.\nAC:L - The bug is a cross-CPU race where irq_work_sync() returns after BUSY is cleared while irq_work_single() still dereferences the work; an attacker can control both sides by concurrently closing/freeing a subsystem object and driving irq_work_queue() from another thread/CPU (e.g. perf fasync wakeup vs. close).\nPR:L - Unprivileged local users can reach vulnerable teardown via perf_event_open/close on per-task events (exclude_kernel=1, default paranoid=2) and via bpf() ringbuf/map cleanup when CAP_BPF is available in a user namespace; no init-namespace root is required for the highest-impact paths.\nUI:N - Exploitation is driven entirely by the attacker's own syscalls and threading; no victim interaction such as opening files or mounting filesystems is needed.\nS:U - Successful exploitation corrupts or reads kernel memory and can yield local privilege escalation within the same kernel security authority; it does not inherently cross a VM/host, IOMMU, or container boundary by itself.\nC:H - This is a kernel heap use-after-free: irq_work_single() dereferences a freed irq_work embedded in structures like perf_event or bpf_ringbuf, enabling arbitrary kernel memory disclosure through heap reuse and controlled reads of stale object fields.\nI:H - The UAF permits attacker-controlled reallocation of the freed irq_work container object, providing a standard kernel heap corruption primitive that can be developed into arbitrary write or control-flow hijack, not merely a bounded modification.\nA:H - Use-after-free in irq_work_single() can immediately fault or panic the kernel during post-BUSY dereferences, and repeated triggering via perf/BPF open-close races can cause persistent denial of service on PREEMPT_RT systems."}]}], "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": 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"https://git.kernel.org/stable/c/91840be8f710370607f949a627e070896faeddb8"}], "title": "irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64073", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:36:05.350468Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:28:11.133Z"}}]}}

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there is no direct network packet or remote-protocol entry point into irq_work.c.\nAC:L - The bug is a cross-CPU race where irq_work_sync() returns after BUSY is cleared while irq_work_single() still dereferences the work; an attacker can control both sides by concurrently closing/freeing a subsystem object and driving irq_work_queue() from another thread/CPU (e.g. perf fasync wakeup vs. close).\nPR:L - Unprivileged local users can reach vulnerable teardown via perf_event_open/close on per-task events (exclude_kernel=1, default paranoid=2) and via bpf() ringbuf/map cleanup when CAP_BPF is available in a user namespace; no init-namespace root is required for the highest-impact paths.\nUI:N - Exploitation is driven entirely by the attacker's own syscalls and threading; no victim interaction such as opening files or mounting filesystems is needed.\nS:U - Successful exploitation corrupts or reads kernel memory and can yield local privilege escalation within the same kernel security authority; it does not inherently cross a VM/host, IOMMU, or container boundary by itself.\nC:H - This is a kernel heap use-after-free: irq_work_single() dereferences a freed irq_work embedded in structures like perf_event or bpf_ringbuf, enabling arbitrary kernel memory disclosure through heap reuse and controlled reads of stale object fields.\nI:H - The UAF permits attacker-controlled reallocation of the freed irq_work container object, providing a standard kernel heap corruption primitive that can be developed into arbitrary write or control-flow hijack, not merely a bounded modification.\nA:H - Use-after-free in irq_work_single() can immediately fault or panic the kernel during post-BUSY dereferences, and repeated triggering via perf/BPF open-close races can cause persistent denial of service on PREEMPT_RT systems."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "810979682ccc98dbd83f341c18a2e556c30a7164", "lessThan": "2dc79362302922cb18f35e262712b5e58de65442", "versionType": "git"}, {"status": "affected", "version": "810979682ccc98dbd83f341c18a2e556c30a7164", "lessThan": "eef4f71b46a9929ac33e968538c9dd5d96a02460", "versionType": "git"}, {"status": "affected", "version": "810979682ccc98dbd83f341c18a2e556c30a7164", "lessThan": "684a78183c54c23e70d1cba320f7fc184604210b", "versionType": "git"}, {"status": "affected", "version": "810979682ccc98dbd83f341c18a2e556c30a7164", "lessThan": "18c0456ea2615b1a743a6db739c74411c3b42bc6", "versionType": "git"}, {"status": "affected", "version": "810979682ccc98dbd83f341c18a2e556c30a7164", "lessThan": "81b582784518196eff1050212a046bc29d3a05dd", "versionType": "git"}, {"status": "affected", "version": "810979682ccc98dbd83f341c18a2e556c30a7164", "lessThan": "91840be8f710370607f949a627e070896faeddb8", "versionType": "git"}], "programFiles": ["kernel/irq_work.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"status": "unaffected", "version": "0", "lessThan": "5.16", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.142", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.92", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.34", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/irq_work.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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 \u2014 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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.142", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.92", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.34", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.11", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:54.369Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64073", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:28:11.133Z", "dateReserved": "2026-07-19T07:54:57.031Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T15:39:48.463Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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."}], "id": "CVE-2026-64073", "lastModified": "2026-10-19T21:17:22.307", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64073", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:36:05.350468Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:47.893", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18c0456ea2615b1a743a6db739c74411c3b42bc6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2dc79362302922cb18f35e262712b5e58de65442"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/684a78183c54c23e70d1cba320f7fc184604210b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/81b582784518196eff1050212a046bc29d3a05dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/91840be8f710370607f949a627e070896faeddb8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eef4f71b46a9929ac33e968538c9dd5d96a02460"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT", "id": "2502506", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502506"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-364", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nirq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT\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.\nAfter irq_work_single() clears BUSY via atomic_cmpxchg(), it still\ndereferences @work for irq_work_is_hard() and rcuwait_wake_up().\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 \u2014 causing a use-after-free.\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.", "A flaw was found in the Linux kernel, specifically within the `irq_work` subsystem when running on systems configured with PREEMPT_RT. This vulnerability is a use-after-free, where the system attempts to access memory after it has been released. A local attacker could exploit this timing issue to cause a system crash, leading to a denial of service. In some scenarios, this type of flaw could potentially be leveraged for arbitrary code execution."], "name": "CVE-2026-64073", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64073\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64073\nhttps://lore.kernel.org/linux-cve-announce/2026071913-CVE-2026-64073-0486@gregkh/T"], "threat_severity": "Moderate"}

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