{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2024-56672 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2024-56672 is a high-severity use after free 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-2024-56672 and fix it if it is affected.\n\nWhat it is: CVE-2024-56672 is a high-severity use after free 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-2024-56672 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-2024-56672/ (Markdown: https://insights.sbomify.com/CVE-2024-56672/index.md)","id":"CVE-2024-56672","markdown":"https://insights.sbomify.com/CVE-2024-56672/index.md","name":"CVE-2024-56672","record":{"aliases":["AZL-54792","AZL-54920","BELL-CVE-2024-56672","DEBIAN-CVE-2024-56672","GHSA-qgw7-mg2m-3x6f","UBUNTU-CVE-2024-56672","USN-7327-1"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel's block cgroup subsystem allows local attackers to potentially execute arbitrary code or escalate privileges.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: Fix UAF in blkcg_unpin_online()\n\nblkcg_unpin_online() walks up the blkcg hierarchy putting the online pin. To\nwalk up, it uses blkcg_parent(blkcg) but it was calling that after\nblkcg_destroy_blkgs(blkcg) which could free the blkcg, leading to the\nfollowing UAF:\n\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in blkcg_unpin_online+0x15a/0x270\n  Read of size 8 at addr ffff8881057678c0 by task kworker/9:1/117\n\n  CPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 Not tainted 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 02/02/2022\n  Workqueue: cgwb_release cgwb_release_workfn\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x27/0x80\n   print_report+0x151/0x710\n   kasan_report+0xc0/0x100\n   blkcg_unpin_online+0x15a/0x270\n   cgwb_release_workfn+0x194/0x480\n   process_scheduled_works+0x71b/0xe20\n   worker_thread+0x82a/0xbd0\n   kthread+0x242/0x2c0\n   ret_from_fork+0x33/0x70\n   ret_from_fork_asm+0x1a/0x30\n   \u003c/TASK\u003e\n  ...\n  Freed by task 1944:\n   kasan_save_track+0x2b/0x70\n   kasan_save_free_info+0x3c/0x50\n   __kasan_slab_free+0x33/0x50\n   kfree+0x10c/0x330\n   css_free_rwork_fn+0xe6/0xb30\n   process_scheduled_works+0x71b/0xe20\n   worker_thread+0x82a/0xbd0\n   kthread+0x242/0x2c0\n   ret_from_fork+0x33/0x70\n   ret_from_fork_asm+0x1a/0x30\n\nNote that the UAF is not easy to trigger as the free path is indirected\nbehind a couple RCU grace periods and a work item execution. I could only\ntrigger it with artifical msleep() injected in blkcg_unpin_online().\n\nFix it by reading the parent pointer before destroying the blkcg's blkg's.","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":"blk-cgroup: Fix UAF in blkcg_unpin_online()","id":"CVE-2024-56672","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2024"},"n_packages":0,"n_references":6,"next":{"headline":"riscv: mm: Do not call pmd dtor on vmemmap page table teardown","id":"CVE-2024-56673"},"packages":[],"prev":{"headline":"gpio: graniterapids: Fix vGPIO driver crash","id":"CVE-2024-56671"},"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":"total"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel's block cgroup subsystem allows local attackers to potentially execute arbitrary code or escalate privileges.","url":"https://insights.sbomify.com/CVE-2024-56672/"}