{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-68178 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-68178 is a denial of service vulnerability in Linux, published on 16 Dec 2025. 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-2025-68178 and fix it if it is affected.\n\nWhat it is: CVE-2025-68178 is a denial of service vulnerability in Linux, published on 16 Dec 2025. 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-2025-68178 in the wild and no public exploit code.\n\nAffected product: Linux. 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-2025-68178/ (Markdown: https://insights.sbomify.com/CVE-2025-68178/index.md)","id":"CVE-2025-68178","markdown":"https://insights.sbomify.com/CVE-2025-68178/index.md","name":"CVE-2025-68178","record":{"aliases":["BELL-CVE-2025-68178","DEBIAN-CVE-2025-68178","GHSA-x8xg-p5wm-9xwj","ROOT-OS-UBUNTU-2204-CVE-2025-68178","ROOT-OS-UBUNTU-2404-CVE-2025-68178","UBUNTU-CVE-2025-68178"],"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 local attacker can trigger a deadlock in the Linux kernel block cgroup policy configuration, causing a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix possible deadlock while configuring policy\n\nFollowing deadlock can be triggered easily by lockdep:\n\nWARNING: possible circular locking dependency detected\n6.17.0-rc3-00124-ga12c2658ced0 #1665 Not tainted\n------------------------------------------------------\ncheck/1334 is trying to acquire lock:\nff1100011d9d0678 (\u0026q-\u003esysfs_lock){+.+.}-{4:4}, at: blk_unregister_queue+0x53/0x180\n\nbut task is already holding lock:\nff1100011d9d00e0 (\u0026q-\u003eq_usage_counter(queue)#3){++++}-{0:0}, at: del_gendisk+0xba/0x110\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #2 (\u0026q-\u003eq_usage_counter(queue)#3){++++}-{0:0}:\n       blk_queue_enter+0x40b/0x470\n       blkg_conf_prep+0x7b/0x3c0\n       tg_set_limit+0x10a/0x3e0\n       cgroup_file_write+0xc6/0x420\n       kernfs_fop_write_iter+0x189/0x280\n       vfs_write+0x256/0x490\n       ksys_write+0x83/0x190\n       __x64_sys_write+0x21/0x30\n       x64_sys_call+0x4608/0x4630\n       do_syscall_64+0xdb/0x6b0\n       entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n-\u003e #1 (\u0026q-\u003erq_qos_mutex){+.+.}-{4:4}:\n       __mutex_lock+0xd8/0xf50\n       mutex_lock_nested+0x2b/0x40\n       wbt_init+0x17e/0x280\n       wbt_enable_default+0xe9/0x140\n       blk_register_queue+0x1da/0x2e0\n       __add_disk+0x38c/0x5d0\n       add_disk_fwnode+0x89/0x250\n       device_add_disk+0x18/0x30\n       virtblk_probe+0x13a3/0x1800\n       virtio_dev_probe+0x389/0x610\n       really_probe+0x136/0x620\n       __driver_probe_device+0xb3/0x230\n       driver_probe_device+0x2f/0xe0\n       __driver_attach+0x158/0x250\n       bus_for_each_dev+0xa9/0x130\n       driver_attach+0x26/0x40\n       bus_add_driver+0x178/0x3d0\n       driver_register+0x7d/0x1c0\n       __register_virtio_driver+0x2c/0x60\n       virtio_blk_init+0x6f/0xe0\n       do_one_initcall+0x94/0x540\n       kernel_init_freeable+0x56a/0x7b0\n       kernel_init+0x2b/0x270\n       ret_from_fork+0x268/0x4c0\n       ret_from_fork_asm+0x1a/0x30\n\n-\u003e #0 (\u0026q-\u003esysfs_lock){+.+.}-{4:4}:\n       __lock_acquire+0x1835/0x2940\n       lock_acquire+0xf9/0x450\n       __mutex_lock+0xd8/0xf50\n       mutex_lock_nested+0x2b/0x40\n       blk_unregister_queue+0x53/0x180\n       __del_gendisk+0x226/0x690\n       del_gendisk+0xba/0x110\n       sd_remove+0x49/0xb0 [sd_mod]\n       device_remove+0x87/0xb0\n       device_release_driver_internal+0x11e/0x230\n       device_release_driver+0x1a/0x30\n       bus_remove_device+0x14d/0x220\n       device_del+0x1e1/0x5a0\n       __scsi_remove_device+0x1ff/0x2f0\n       scsi_remove_device+0x37/0x60\n       sdev_store_delete+0x77/0x100\n       dev_attr_store+0x1f/0x40\n       sysfs_kf_write+0x65/0x90\n       kernfs_fop_write_iter+0x189/0x280\n       vfs_write+0x256/0x490\n       ksys_write+0x83/0x190\n       __x64_sys_write+0x21/0x30\n       x64_sys_call+0x4608/0x4630\n       do_syscall_64+0xdb/0x6b0\n       entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nother info that might help us debug this:\n\nChain exists of:\n  \u0026q-\u003esysfs_lock --\u003e \u0026q-\u003erq_qos_mutex --\u003e \u0026q-\u003eq_usage_counter(queue)#3\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(\u0026q-\u003eq_usage_counter(queue)#3);\n                               lock(\u0026q-\u003erq_qos_mutex);\n                               lock(\u0026q-\u003eq_usage_counter(queue)#3);\n  lock(\u0026q-\u003esysfs_lock);\n\nRoot cause is that queue_usage_counter is grabbed with rq_qos_mutex\nheld in blkg_conf_prep(), while queue should be freezed before\nrq_qos_mutex from other context.\n\nThe blk_queue_enter() from blkg_conf_prep() is used to protect against\npolicy deactivation, which is already protected with blkcg_mutex, hence\nconvert blk_queue_enter() to blkcg_mutex to fix this problem. Meanwhile,\nconsider that blkcg_mutex is held after queue is freezed from policy\ndeactivation, also convert blkg_alloc() to use GFP_NOIO.","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 possible deadlock while configuring policy","id":"CVE-2025-68178","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":4,"next":{"headline":"s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP","id":"CVE-2025-68179"},"packages":[],"prev":{"headline":"cpufreq/longhaul: handle NULL policy in longhaul_exit","id":"CVE-2025-68177"},"products":["Linux"],"published":"2025-12-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-05-23","vendors":["Linux"]},"summary":"A local attacker can trigger a deadlock in the Linux kernel block cgroup policy configuration, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2025-68178/"}