{"id":"CVE-2026-23085","state":"PUBLISHED","title":"irqchip/gic-v3-its: Avoid truncating memory addresses","description":"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.","publishedAt":"2026-02-04T16:08:09.368Z","updatedAt":"2026-10-19T18:25:29.916Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"e332b3b69e5b3acf07204a4b185071bab15c2b88","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"e2f9c751f73a2d5bb62d94ab030aec118a811f27","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"85215d633983233809f7d4dad163b953331b8238","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"1b323391560354d8c515de8658b057a1daa82adb","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"084ba3b99f2dfd991ce7e84fb17117319ec3cd9f","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"8d76a7d89c12d08382b66e2f21f20d0627d14859","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/irqchip/irq-gic-v3-its.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/irqchip/irq-gic-v3-its.c"]}],"references":["https://git.kernel.org/stable/c/e332b3b69e5b3acf07204a4b185071bab15c2b88","https://git.kernel.org/stable/c/e2f9c751f73a2d5bb62d94ab030aec118a811f27","https://git.kernel.org/stable/c/85215d633983233809f7d4dad163b953331b8238","https://git.kernel.org/stable/c/1b323391560354d8c515de8658b057a1daa82adb","https://git.kernel.org/stable/c/084ba3b99f2dfd991ce7e84fb17117319ec3cd9f","https://git.kernel.org/stable/c/03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98","https://git.kernel.org/stable/c/8d76a7d89c12d08382b66e2f21f20d0627d14859"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23085.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23085","state":"PUBLISHED","datePublished":"2026-02-04T16:08:09.368Z","dateUpdated":"2026-10-19T18:25:29.916Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.961Z"},"containers":{"cna":{"title":"irqchip/gic-v3-its: Avoid truncating memory addresses","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"e332b3b69e5b3acf07204a4b185071bab15c2b88","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"e2f9c751f73a2d5bb62d94ab030aec118a811f27","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"85215d633983233809f7d4dad163b953331b8238","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"1b323391560354d8c515de8658b057a1daa82adb","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"084ba3b99f2dfd991ce7e84fb17117319ec3cd9f","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98","versionType":"git"},{"version":"cc2d3216f53c9fff0030eb71cacc4ce5f39d1d7e","status":"affected","lessThan":"8d76a7d89c12d08382b66e2f21f20d0627d14859","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/irqchip/irq-gic-v3-its.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/irqchip/irq-gic-v3-its.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e332b3b69e5b3acf07204a4b185071bab15c2b88"},{"url":"https://git.kernel.org/stable/c/e2f9c751f73a2d5bb62d94ab030aec118a811f27"},{"url":"https://git.kernel.org/stable/c/85215d633983233809f7d4dad163b953331b8238"},{"url":"https://git.kernel.org/stable/c/1b323391560354d8c515de8658b057a1daa82adb"},{"url":"https://git.kernel.org/stable/c/084ba3b99f2dfd991ce7e84fb17117319ec3cd9f"},{"url":"https://git.kernel.org/stable/c/03faa61eb4b9ca9aa09bd91d4c3773d8e7b1ac98"},{"url":"https://git.kernel.org/stable/c/8d76a7d89c12d08382b66e2f21f20d0627d14859"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:59:42.618Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.10.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.12.68"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.18.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-23085","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-06-10T20:40:42.445145Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","type":"CWE","description":"CWE-190 Integer Overflow or Wraparound"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T18:25:29.916Z"}}]}}}