GHSA-V2XC-C9FW-V73W

Vulnerability from github – Published: 2026-02-04 18:30 – Updated: 2026-02-06 18:30
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

irqchip/gic-v3-its: Avoid truncating memory addresses

On 32-bit machines with CONFIG_ARM_LPAE, it is possible for lowmem allocations to be backed by addresses physical memory above the 32-bit address limit, as found while experimenting with larger VMSPLIT configurations.

This caused the qemu virt model to crash in the GICv3 driver, which allocates the 'itt' object using GFP_KERNEL. Since all memory below the 4GB physical address limit is in ZONE_DMA in this configuration, kmalloc() defaults to higher addresses for ZONE_NORMAL, and the ITS driver stores the physical address in a 32-bit 'unsigned long' variable.

Change the itt_addr variable to the correct phys_addr_t type instead, along with all other variables in this driver that hold a physical address.

The gicv5 driver correctly uses u64 variables, while all other irqchip drivers don't call virt_to_phys or similar interfaces. It's expected that other device drivers have similar issues, but fixing this one is sufficient for booting a virtio based guest.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23085"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-04T17:16:19Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nirqchip/gic-v3-its: Avoid truncating memory addresses\n\nOn 32-bit machines with CONFIG_ARM_LPAE, it is possible for lowmem\nallocations to be backed by addresses physical memory above the 32-bit\naddress limit, as found while experimenting with larger VMSPLIT\nconfigurations.\n\nThis caused the qemu virt model to crash in the GICv3 driver, which\nallocates the \u0027itt\u0027 object using GFP_KERNEL. Since all memory below\nthe 4GB physical address limit is in ZONE_DMA in this configuration,\nkmalloc() defaults to higher addresses for ZONE_NORMAL, and the\nITS driver stores the physical address in a 32-bit \u0027unsigned long\u0027\nvariable.\n\nChange the itt_addr variable to the correct phys_addr_t type instead,\nalong with all other variables in this driver that hold a physical\naddress.\n\nThe gicv5 driver correctly uses u64 variables, while all other irqchip\ndrivers don\u0027t call virt_to_phys or similar interfaces. It\u0027s expected that\nother device drivers have similar issues, but fixing this one is\nsufficient for booting a virtio based guest.",
  "id": "GHSA-v2xc-c9fw-v73w",
  "modified": "2026-02-06T18:30:30Z",
  "published": "2026-02-04T18:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23085"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/084ba3b99f2dfd991ce7e84fb17117319ec3cd9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b323391560354d8c515de8658b057a1daa82adb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85215d633983233809f7d4dad163b953331b8238"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d76a7d89c12d08382b66e2f21f20d0627d14859"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e2f9c751f73a2d5bb62d94ab030aec118a811f27"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e332b3b69e5b3acf07204a4b185071bab15c2b88"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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