{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"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 (&q->sysfs_lock){+.+.}-{4:4}, at: blk_unregister_queue+0x53/0x180\n\nbut task is already holding lock:\nff1100011d9d00e0 (&q->q_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-> #2 (&q->q_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-> #1 (&q->rq_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-> #0 (&q->sysfs_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 &q->sysfs_lock --> &q->rq_qos_mutex --> &q->q_usage_counter(queue)#3\n\n Possible unsafe locking scenario:\n\n CPU0 CPU1\n ---- ----\n lock(&q->q_usage_counter(queue)#3);\n lock(&q->rq_qos_mutex);\n lock(&q->q_usage_counter(queue)#3);\n lock(&q->sysfs_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.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68178" }, { "summary":"CVE-2025-68178 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2025/csaf-openeuler-cve-2025-68178.json" }, { "summary":"openEuler-SA-2026-1305", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1305" }, { "summary":"CVE-2025-68178", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2025-68178&packageName=kernel" } ], "title":"openEuler cve CVE-2025-68178", "tracking":{ "initial_release_date":"2026-02-10T14:53:10+08:00", "revision_history":[ { "date":"2026-02-10T14:53:10+08:00", "summary":"Initial", "number":"1.0.0" } 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(&q->q_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-> #1 (&q->rq_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-> #0 (&q->sysfs_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 &q->sysfs_lock --> &q->rq_qos_mutex --> &q->q_usage_counter(queue)#3\n\n Possible unsafe locking scenario:\n\n CPU0 CPU1\n ---- ----\n lock(&q->q_usage_counter(queue)#3);\n lock(&q->rq_qos_mutex);\n lock(&q->q_usage_counter(queue)#3);\n lock(&q->sysfs_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.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS-SP2:bpftool-6.6.0-138.0.0.132.oe2403sp2.aarch64", "openEuler-24.03-LTS-SP2:bpftool-debuginfo-6.6.0-138.0.0.132.oe2403sp2.aarch64", "openEuler-24.03-LTS-SP2:kernel-6.6.0-138.0.0.132.oe2403sp2.aarch64", "openEuler-24.03-LTS-SP2:kernel-debuginfo-6.6.0-138.0.0.132.oe2403sp2.aarch64", "openEuler-24.03-LTS-SP2:kernel-debugsource-6.6.0-138.0.0.132.oe2403sp2.aarch64", "openEuler-24.03-LTS-SP2:kernel-devel-6.6.0-138.0.0.132.oe2403sp2.aarch64", "openEuler-24.03-LTS-SP2:kernel-extra-modules-6.6.0-138.0.0.132.oe2403sp2.aarch64", "openEuler-24.03-LTS-SP2:kernel-headers-6.6.0-138.0.0.132.oe2403sp2.aarch64", "openEuler-24.03-LTS-SP2:kernel-source-6.6.0-138.0.0.132.oe2403sp2.aarch64", 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"openEuler-24.03-LTS-SP2:kernel-tools-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:kernel-tools-debuginfo-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:kernel-tools-devel-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:perf-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:perf-debuginfo-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:python3-perf-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:python3-perf-debuginfo-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:kernel-6.6.0-138.0.0.132.oe2403sp2.src" ], "details":"kernel security update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1305" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"MEDIUM", "baseScore":5.5, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version":"3.1" }, "products":[ 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"openEuler-24.03-LTS-SP2:kernel-tools-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:kernel-tools-debuginfo-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:kernel-tools-devel-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:perf-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:perf-debuginfo-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:python3-perf-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:python3-perf-debuginfo-6.6.0-138.0.0.132.oe2403sp2.x86_64", "openEuler-24.03-LTS-SP2:kernel-6.6.0-138.0.0.132.oe2403sp2.src" ] } ], "threats":[ { "details":"Medium", "category":"impact" } ], "title":"CVE-2025-68178" } ] }