{"id":"CVE-2026-23085","summary":"irqchip/gic-v3-its: Avoid truncating memory addresses","details":"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 'itt' 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 'unsigned long'\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't call virt_to_phys or similar interfaces. It's expected that\nother device drivers have similar issues, but fixing this one is\nsufficient for booting a virtio based guest.","modified":"2026-04-02T17:30:03.464409Z","published":"2026-02-04T16:08:09.368Z","related":["SUSE-SU-2026:0962-1","SUSE-SU-2026:1078-1","SUSE-SU-2026:1081-1","SUSE-SU-2026:20667-1","SUSE-SU-2026:20720-1","SUSE-SU-2026:20838-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20876-1","SUSE-SU-2026:20931-1","openSUSE-SU-2026:20416-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23085.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98"},{"type":"WEB","url":"https://git.kernel.org/stable/c/084ba3b99f2dfd991ce7e84fb17117319ec3cd9f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1b323391560354d8c515de8658b057a1daa82adb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/85215d633983233809f7d4dad163b953331b8238"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8d76a7d89c12d08382b66e2f21f20d0627d14859"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2f9c751f73a2d5bb62d94ab030aec118a811f27"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e332b3b69e5b3acf07204a4b185071bab15c2b88"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23085.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23085"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e"},{"fixed":"e332b3b69e5b3acf07204a4b185071bab15c2b88"},{"fixed":"e2f9c751f73a2d5bb62d94ab030aec118a811f27"},{"fixed":"85215d633983233809f7d4dad163b953331b8238"},{"fixed":"1b323391560354d8c515de8658b057a1daa82adb"},{"fixed":"084ba3b99f2dfd991ce7e84fb17117319ec3cd9f"},{"fixed":"03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98"},{"fixed":"8d76a7d89c12d08382b66e2f21f20d0627d14859"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23085.json"}}],"schema_version":"1.7.5"}