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

Vulnerability from cvelistv5 – Published: 2026-02-04 16:08 – Updated: 2026-06-11 18:44
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 , ≤ * (original_commit_for_fix)
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Sightings

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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.