{"id":"CVE-2026-64073","revision":null,"records":[{"revision":"a022d3381aa04c358ae1735814dd67f6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64073","aliases":[],"title":"irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT","description":"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.","state":0,"publishedAt":"2026-07-19T15:39:48.463+00:00","modifiedAt":"2026-10-19T20:28:11.133+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"kernel/irq_work.c\"\n ],\n \"versions\": [\n {\n \"version\": \"810979682ccc98dbd83f341c18a2e556c30a7164\",\n \"lessThan\": \"2dc79362302922cb18f35e262712b5e58de65442\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"810979682ccc98dbd83f341c18a2e556c30a7164\",\n \"lessThan\": \"eef4f71b46a9929ac33e968538c9dd5d96a02460\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"810979682ccc98dbd83f341c18a2e556c30a7164\",\n \"lessThan\": \"684a78183c54c23e70d1cba320f7fc184604210b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"810979682ccc98dbd83f341c18a2e556c30a7164\",\n \"lessThan\": \"18c0456ea2615b1a743a6db739c74411c3b42bc6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"810979682ccc98dbd83f341c18a2e556c30a7164\",\n \"lessThan\": \"81b582784518196eff1050212a046bc29d3a05dd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"810979682ccc98dbd83f341c18a2e556c30a7164\",\n \"lessThan\": \"91840be8f710370607f949a627e070896faeddb8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"kernel/irq_work.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.16\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.16\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.142\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.92\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.34\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.11\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/2dc79362302922cb18f35e262712b5e58de65442","https://git.kernel.org/stable/c/eef4f71b46a9929ac33e968538c9dd5d96a02460","https://git.kernel.org/stable/c/684a78183c54c23e70d1cba320f7fc184604210b","https://git.kernel.org/stable/c/18c0456ea2615b1a743a6db739c74411c3b42bc6","https://git.kernel.org/stable/c/81b582784518196eff1050212a046bc29d3a05dd","https://git.kernel.org/stable/c/91840be8f710370607f949a627e070896faeddb8"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64073","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64073","identifiers":["CVE-2026-64073"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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