{"id":"CVE-2024-56668","state":"PUBLISHED","title":"iommu/vt-d: Fix qi_batch NULL pointer with nested parent domain","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Fix qi_batch NULL pointer with nested parent domain\n\nThe qi_batch is allocated when assigning cache tag for a domain. While\nfor nested parent domain, it is missed. Hence, when trying to map pages\nto the nested parent, NULL dereference occurred. Also, there is potential\nmemleak since there is no lock around domain->qi_batch allocation.\n\nTo solve it, add a helper for qi_batch allocation, and call it in both\nthe __cache_tag_assign_domain() and __cache_tag_assign_parent_domain().\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000200\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  PGD 8104795067 P4D 0\n  Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n  CPU: 223 UID: 0 PID: 4357 Comm: qemu-system-x86 Not tainted 6.13.0-rc1-00028-g4b50c3c3b998-dirty #2632\n  Call Trace:\n   ? __die+0x24/0x70\n   ? page_fault_oops+0x80/0x150\n   ? do_user_addr_fault+0x63/0x7b0\n   ? exc_page_fault+0x7c/0x220\n   ? asm_exc_page_fault+0x26/0x30\n   ? cache_tag_flush_range_np+0x13c/0x260\n   intel_iommu_iotlb_sync_map+0x1a/0x30\n   iommu_map+0x61/0xf0\n   batch_to_domain+0x188/0x250\n   iopt_area_fill_domains+0x125/0x320\n   ? rcu_is_watching+0x11/0x50\n   iopt_map_pages+0x63/0x100\n   iopt_map_common.isra.0+0xa7/0x190\n   iopt_map_user_pages+0x6a/0x80\n   iommufd_ioas_map+0xcd/0x1d0\n   iommufd_fops_ioctl+0x118/0x1c0\n   __x64_sys_ioctl+0x93/0xc0\n   do_syscall_64+0x71/0x140\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e","publishedAt":"2024-12-27T15:06:29.879Z","updatedAt":"2026-05-11T20:56:56.558Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"705c1cdf1e73c4c727bbfc8775434e6dd36e8baf","status":"affected","lessThan":"ffd774c34774fd4cc0e9cf2976595623a6c3a077","versionType":"git"},{"version":"705c1cdf1e73c4c727bbfc8775434e6dd36e8baf","status":"affected","lessThan":"74536f91962d5f6af0a42414773ce61e653c10ee","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/intel/cache.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.6","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/intel/cache.c"]}],"references":["https://git.kernel.org/stable/c/ffd774c34774fd4cc0e9cf2976595623a6c3a077","https://git.kernel.org/stable/c/74536f91962d5f6af0a42414773ce61e653c10ee"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:08:12.933Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/56xxx/CVE-2024-56668.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-56668","state":"PUBLISHED","datePublished":"2024-12-27T15:06:29.879Z","dateUpdated":"2026-05-11T20:56:56.558Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-27T15:00:39.844Z"},"containers":{"cna":{"title":"iommu/vt-d: Fix qi_batch NULL pointer with nested parent domain","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Fix qi_batch NULL pointer with nested parent domain\n\nThe qi_batch is allocated when assigning cache tag for a domain. While\nfor nested parent domain, it is missed. Hence, when trying to map pages\nto the nested parent, NULL dereference occurred. Also, there is potential\nmemleak since there is no lock around domain->qi_batch allocation.\n\nTo solve it, add a helper for qi_batch allocation, and call it in both\nthe __cache_tag_assign_domain() and __cache_tag_assign_parent_domain().\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000200\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  PGD 8104795067 P4D 0\n  Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n  CPU: 223 UID: 0 PID: 4357 Comm: qemu-system-x86 Not tainted 6.13.0-rc1-00028-g4b50c3c3b998-dirty #2632\n  Call Trace:\n   ? __die+0x24/0x70\n   ? page_fault_oops+0x80/0x150\n   ? do_user_addr_fault+0x63/0x7b0\n   ? exc_page_fault+0x7c/0x220\n   ? asm_exc_page_fault+0x26/0x30\n   ? cache_tag_flush_range_np+0x13c/0x260\n   intel_iommu_iotlb_sync_map+0x1a/0x30\n   iommu_map+0x61/0xf0\n   batch_to_domain+0x188/0x250\n   iopt_area_fill_domains+0x125/0x320\n   ? rcu_is_watching+0x11/0x50\n   iopt_map_pages+0x63/0x100\n   iopt_map_common.isra.0+0xa7/0x190\n   iopt_map_user_pages+0x6a/0x80\n   iommufd_ioas_map+0xcd/0x1d0\n   iommufd_fops_ioctl+0x118/0x1c0\n   __x64_sys_ioctl+0x93/0xc0\n   do_syscall_64+0x71/0x140\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"705c1cdf1e73c4c727bbfc8775434e6dd36e8baf","status":"affected","lessThan":"ffd774c34774fd4cc0e9cf2976595623a6c3a077","versionType":"git"},{"version":"705c1cdf1e73c4c727bbfc8775434e6dd36e8baf","status":"affected","lessThan":"74536f91962d5f6af0a42414773ce61e653c10ee","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/intel/cache.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.6","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/intel/cache.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ffd774c34774fd4cc0e9cf2976595623a6c3a077"},{"url":"https://git.kernel.org/stable/c/74536f91962d5f6af0a42414773ce61e653c10ee"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:56:56.558Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2024-56668","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:59:41.118467Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T20:07:09.384Z"}}]}}}