CVE-2026-23085 (GCVE-0-2026-23085)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:08 – Updated: 2026-02-06 16:33
VLAI?
Title
irqchip/gic-v3-its: Avoid truncating memory addresses
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e , < e332b3b69e5b3acf07204a4b185071bab15c2b88 (git)
Affected: cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e , < e2f9c751f73a2d5bb62d94ab030aec118a811f27 (git)
Affected: cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e , < 85215d633983233809f7d4dad163b953331b8238 (git)
Affected: cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e , < 1b323391560354d8c515de8658b057a1daa82adb (git)
Affected: cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e , < 084ba3b99f2dfd991ce7e84fb17117319ec3cd9f (git)
Affected: cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e , < 03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98 (git)
Affected: cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e , < 8d76a7d89c12d08382b66e2f21f20d0627d14859 (git)
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    Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc7 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/irqchip/irq-gic-v3-its.c"
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          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-06T16:33:05.921Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-02-04T16:08:09.368Z",
    "dateReserved": "2026-01-13T15:37:45.961Z",
    "dateUpdated": "2026-02-06T16:33:05.921Z",
    "state": "PUBLISHED"
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  }
}


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  • 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.
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  • 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.