{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2024-56668 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2024-56668 is a medium-severity vulnerability in Linux kernel, published on 27 Dec 2024. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2024-56668 and fix it if it is affected.\n\nWhat it is: CVE-2024-56668 is a medium-severity vulnerability in Linux kernel, published on 27 Dec 2024. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2024-56668 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2024-56668/ (Markdown: https://insights.sbomify.com/CVE-2024-56668/index.md)","id":"CVE-2024-56668","markdown":"https://insights.sbomify.com/CVE-2024-56668/index.md","name":"CVE-2024-56668","record":{"aliases":["BELL-CVE-2024-56668","DEBIAN-CVE-2024-56668","GHSA-7hpx-3fcf-fxr2","UBUNTU-CVE-2024-56668"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A missing allocation in the Linux kernel IOMMU driver causes a NULL pointer dereference, leading to a system crash when mapping pages for nested parent domains.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-401","name":"Missing Release of Memory after Effective Lifetime"},{"id":"CWE-476","name":"NULL Pointer Dereference"}],"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-\u003eqi_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","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"iommu/vt-d: Fix qi_batch NULL pointer with nested parent domain","id":"CVE-2024-56668","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2024"},"n_packages":0,"n_references":2,"next":{"headline":"iommu/vt-d: Remove cache tags before disabling ATS","id":"CVE-2024-56669"},"packages":[],"prev":{"headline":"drm/i915: Fix NULL pointer dereference in capture_engine","id":"CVE-2024-56667"},"products":["Linux"],"published":"2024-12-27","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A missing allocation in the Linux kernel IOMMU driver causes a NULL pointer dereference, leading to a system crash when mapping pages for nested parent domains.","url":"https://insights.sbomify.com/CVE-2024-56668/"}