CVE-2026-64073 (GCVE-0-2026-64073)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38
VLAI
Title
irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT
Summary
In the Linux kernel, the following vulnerability has been resolved: irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT On PREEMPT_RT, non-HARD irq_work runs in per-CPU kthreads via run_irq_workd(), so irq_work_sync() uses rcuwait() to wait for BUSY==0. After irq_work_single() clears BUSY via atomic_cmpxchg(), it still dereferences @work for irq_work_is_hard() and rcuwait_wake_up(). An irq_work_sync() caller on another CPU that enters after BUSY is cleared can observe BUSY==0 immediately, return, and free the work before those accesses complete — causing a use-after-free. Fix this by wrapping run_irq_workd() in guard(rcu)() so that the entire irq_work_single() execution is within an RCU read-side critical section. Then add synchronize_rcu() in irq_work_sync() after rcuwait_wait_event() to ensure the caller waits for the RCU grace period before returning, preventing premature frees.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 810979682ccc98dbd83f341c18a2e556c30a7164 , < 2dc79362302922cb18f35e262712b5e58de65442 (git)
Affected: 810979682ccc98dbd83f341c18a2e556c30a7164 , < eef4f71b46a9929ac33e968538c9dd5d96a02460 (git)
Affected: 810979682ccc98dbd83f341c18a2e556c30a7164 , < 684a78183c54c23e70d1cba320f7fc184604210b (git)
Affected: 810979682ccc98dbd83f341c18a2e556c30a7164 , < 18c0456ea2615b1a743a6db739c74411c3b42bc6 (git)
Affected: 810979682ccc98dbd83f341c18a2e556c30a7164 , < 81b582784518196eff1050212a046bc29d3a05dd (git)
Affected: 810979682ccc98dbd83f341c18a2e556c30a7164 , < 91840be8f710370607f949a627e070896faeddb8 (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64073.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:44:21Z",
      "cve": "CVE-2026-64073",
      "id": "CVE-2026-64073",
      "initial_release_date": "2026-07-21T13:00:11Z",
      "product_status:known_affected": "586",
      "product_status:known_not_affected": "147",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64073",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64073.json",
      "version": "10"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.