CVE-2026-98938 (GCVE-0-2026-98938)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:11 – Updated: 2026-10-23 12:11
VLAI
Title
rust: irq: pass RegistrationInner as cookie to request_irq
Summary
In the Linux kernel, the following vulnerability has been resolved: rust: irq: pass RegistrationInner as cookie to request_irq With commit ba268514ea14 ("rust: devres: fix race condition due to nesting"), Devres::new() returns Result<Self> by value instead of initializing in-place via PinInit. Because request_irq() is called inside Devres::new(), registration.inner is still uninitialized when the IRQ is enabled, so accessing registration.inner.device() in the IRQ callback can read uninitialized memory. Fix this by storing the Device and handler pointer in RegistrationInner and passing RegistrationInner as the IRQ cookie after its fields are initialized. This is not needed in mainline because commit 98c63ce4d760 ("rust: irq: make Registration compatible with lifetime-bound drivers") removed Devres from irq::Registration and moved request_irq() after all fields are initialized.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 29e16fcd67ee5b1d0417a657294cf96fdf2f8df9 , < 9a7931e847f338a687e96cde9f37e0cff83ddd84 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust: irq: pass RegistrationInner as cookie to request_irq\n\nWith commit ba268514ea14 (\"rust: devres: fix race condition due to\nnesting\"), Devres::new() returns Result\u003cSelf\u003e by value instead of\ninitializing in-place via PinInit. Because request_irq() is called\ninside Devres::new(), registration.inner is still uninitialized when the\nIRQ is enabled, so accessing registration.inner.device() in the IRQ\ncallback can read uninitialized memory.\n\nFix this by storing the Device and handler pointer in RegistrationInner\nand passing RegistrationInner as the IRQ cookie after its fields are\ninitialized.\n\nThis is not needed in mainline because commit 98c63ce4d760 (\"rust: irq:\nmake Registration compatible with lifetime-bound drivers\") removed\nDevres from irq::Registration and moved request_irq() after all fields\nare initialized."
        }
      ],
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/9a7931e847f338a687e96cde9f37e0cff83ddd84"
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      "title": "rust: irq: pass RegistrationInner as cookie to request_irq",
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    "datePublished": "2026-10-23T12:11:59.043Z",
    "dateReserved": "2026-09-25T10:25:14.381Z",
    "dateUpdated": "2026-10-23T12:11:59.043Z",
    "state": "PUBLISHED"
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      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
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      "title": "rust: irq: pass RegistrationInner as cookie to request_irq",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98938.json",
      "version": "1"
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    "nvd": {
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        "affected": [
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust: irq: pass RegistrationInner as cookie to request_irq\n\nWith commit ba268514ea14 (\"rust: devres: fix race condition due to\nnesting\"), Devres::new() returns Result\u003cSelf\u003e by value instead of\ninitializing in-place via PinInit. Because request_irq() is called\ninside Devres::new(), registration.inner is still uninitialized when the\nIRQ is enabled, so accessing registration.inner.device() in the IRQ\ncallback can read uninitialized memory.\n\nFix this by storing the Device and handler pointer in RegistrationInner\nand passing RegistrationInner as the IRQ cookie after its fields are\ninitialized.\n\nThis is not needed in mainline because commit 98c63ce4d760 (\"rust: irq:\nmake Registration compatible with lifetime-bound drivers\") removed\nDevres from irq::Registration and moved request_irq() after all fields\nare initialized."
          }
        ],
        "id": "CVE-2026-98938",
        "lastModified": "2026-10-23T13:17:14.720",
        "metrics": {},
        "published": "2026-10-23T13:17:14.720",
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      "cve": "CVE-2026-98938",
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      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
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      "title": "kernel: kernel: Denial of Service via uninitialized memory read in Rust IRQ registration",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98938.json",
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    }
  }
}



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