{"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": "2026-07-19T15:39:48.463Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:39:48.463Z"}, "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."}], "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"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.6.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.1"}]}]}], "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", "x_generator": {"engine": "bippy-1.2.0"}}}}

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