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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-23085

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-23085

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
        "lessThan": "e332b3b69e5b3acf07204a4b185071bab15c2b88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
        "lessThan": "e2f9c751f73a2d5bb62d94ab030aec118a811f27",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
        "lessThan": "85215d633983233809f7d4dad163b953331b8238",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
        "lessThan": "1b323391560354d8c515de8658b057a1daa82adb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
        "lessThan": "084ba3b99f2dfd991ce7e84fb17117319ec3cd9f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
        "lessThan": "03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e",
        "lessThan": "8d76a7d89c12d08382b66e2f21f20d0627d14859",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/irqchip/irq-gic-v3-its.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.249",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.199",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.162",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.122",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.68",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.8",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/irqchip/irq-gic-v3-its.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23085

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#39745 · Revision 1
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Publisher date
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