{"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":{"cna":{"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"}]}],"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"}}}}