CVE-2026-23085
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…
Does this matter?
Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98Patch
- https://git.kernel.org/stable/c/084ba3b99f2dfd991ce7e84fb17117319ec3cd9fPatch
- https://git.kernel.org/stable/c/1b323391560354d8c515de8658b057a1daa82adbPatch
- https://git.kernel.org/stable/c/85215d633983233809f7d4dad163b953331b8238Patch
- https://git.kernel.org/stable/c/8d76a7d89c12d08382b66e2f21f20d0627d14859Patch
- https://git.kernel.org/stable/c/e2f9c751f73a2d5bb62d94ab030aec118a811f27Patch
- https://git.kernel.org/stable/c/e332b3b69e5b3acf07204a4b185071bab15c2b88Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.