CVE-2026-23085None▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e < e332b3b69e5b3acf07204a4b185071bab15c2b88Linux >= cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e < e2f9c751f73a2d5bb62d94ab030aec118a811f27Linux >= cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e < 85215d633983233809f7d4dad163b953331b8238Linux >= cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e < 1b323391560354d8c515de8658b057a1daa82adbLinux >= cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e < 084ba3b99f2dfd991ce7e84fb17117319ec3cd9fLinux >= cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e < 03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98Linux >= cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e < 8d76a7d89c12d08382b66e2f21f20d0627d14859Linux 3.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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