{ "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\nfuse: fix livelock in synchronous file put from fuseblk workers\n\nI observed a hang when running generic/323 against a fuseblk server.\nThis test opens a file, initiates a lot of AIO writes to that file\ndescriptor, and closes the file descriptor before the writes complete.\nUnsurprisingly, the AIO exerciser threads are mostly stuck waiting for\nresponses from the fuseblk server:\n\n# cat /proc/372265/task/372313/stack\n[<0>] request_wait_answer+0x1fe/0x2a0 [fuse]\n[<0>] __fuse_simple_request+0xd3/0x2b0 [fuse]\n[<0>] fuse_do_getattr+0xfc/0x1f0 [fuse]\n[<0>] fuse_file_read_iter+0xbe/0x1c0 [fuse]\n[<0>] aio_read+0x130/0x1e0\n[<0>] io_submit_one+0x542/0x860\n[<0>] __x64_sys_io_submit+0x98/0x1a0\n[<0>] do_syscall_64+0x37/0xf0\n[<0>] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nBut the /weird/ part is that the fuseblk server threads are waiting for\nresponses from itself:\n\n# cat /proc/372210/task/372232/stack\n[<0>] request_wait_answer+0x1fe/0x2a0 [fuse]\n[<0>] __fuse_simple_request+0xd3/0x2b0 [fuse]\n[<0>] fuse_file_put+0x9a/0xd0 [fuse]\n[<0>] fuse_release+0x36/0x50 [fuse]\n[<0>] __fput+0xec/0x2b0\n[<0>] task_work_run+0x55/0x90\n[<0>] syscall_exit_to_user_mode+0xe9/0x100\n[<0>] do_syscall_64+0x43/0xf0\n[<0>] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nThe fuseblk server is fuse2fs so there's nothing all that exciting in\nthe server itself. So why is the fuse server calling fuse_file_put?\nThe commit message for the fstest sheds some light on that:\n\n\"By closing the file descriptor before calling io_destroy, you pretty\nmuch guarantee that the last put on the ioctx will be done in interrupt\ncontext (during I/O completion).\n\nAha. AIO fgets a new struct file from the fd when it queues the ioctx.\nThe completion of the FUSE_WRITE command from userspace causes the fuse\nserver to call the AIO completion function. The completion puts the\nstruct file, queuing a delayed fput to the fuse server task. When the\nfuse server task returns to userspace, it has to run the delayed fput,\nwhich in the case of a fuseblk server, it does synchronously.\n\nSending the FUSE_RELEASE command sychronously from fuse server threads\nis a bad idea because a client program can initiate enough simultaneous\nAIOs such that all the fuse server threads end up in delayed_fput, and\nnow there aren't any threads left to handle the queued fuse commands.\n\nFix this by only using asynchronous fputs when closing files, and leave\na comment explaining why.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40220" }, { "summary":"CVE-2025-40220 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2025/csaf-openeuler-cve-2025-40220.json" }, { "summary":"openEuler-SA-2026-1761", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1761" }, { "summary":"CVE-2025-40220", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2025-40220&packageName=kernel" } ], "title":"openEuler cve CVE-2025-40220", "tracking":{ "initial_release_date":"2026-03-30T15:49:39+08:00", "revision_history":[ { "date":"2026-03-30T15:49:39+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-03-30T15:49:39+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-03-30T15:49:39+08:00", "id":"CVE-2025-40220", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS-SP2" }, "product_id":"openEuler-24.03-LTS-SP2", "name":"openEuler-24.03-LTS-SP2" }, 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}, "vulnerabilities":[ { "cve":"CVE-2025-40220", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix livelock in synchronous file put from fuseblk workers\n\nI observed a hang when running generic/323 against a fuseblk server.\nThis test opens a file, initiates a lot of AIO writes to that file\ndescriptor, and closes the file descriptor before the writes complete.\nUnsurprisingly, the AIO exerciser threads are mostly stuck waiting for\nresponses from the fuseblk server:\n\n# cat /proc/372265/task/372313/stack\n[<0>] request_wait_answer+0x1fe/0x2a0 [fuse]\n[<0>] __fuse_simple_request+0xd3/0x2b0 [fuse]\n[<0>] fuse_do_getattr+0xfc/0x1f0 [fuse]\n[<0>] fuse_file_read_iter+0xbe/0x1c0 [fuse]\n[<0>] aio_read+0x130/0x1e0\n[<0>] io_submit_one+0x542/0x860\n[<0>] __x64_sys_io_submit+0x98/0x1a0\n[<0>] do_syscall_64+0x37/0xf0\n[<0>] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nBut the /weird/ part is that the fuseblk server threads are waiting for\nresponses from itself:\n\n# cat /proc/372210/task/372232/stack\n[<0>] request_wait_answer+0x1fe/0x2a0 [fuse]\n[<0>] __fuse_simple_request+0xd3/0x2b0 [fuse]\n[<0>] fuse_file_put+0x9a/0xd0 [fuse]\n[<0>] fuse_release+0x36/0x50 [fuse]\n[<0>] __fput+0xec/0x2b0\n[<0>] task_work_run+0x55/0x90\n[<0>] syscall_exit_to_user_mode+0xe9/0x100\n[<0>] do_syscall_64+0x43/0xf0\n[<0>] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nThe fuseblk server is fuse2fs so there's nothing all that exciting in\nthe server itself. So why is the fuse server calling fuse_file_put?\nThe commit message for the fstest sheds some light on that:\n\n\"By closing the file descriptor before calling io_destroy, you pretty\nmuch guarantee that the last put on the ioctx will be done in interrupt\ncontext (during I/O completion).\n\nAha. AIO fgets a new struct file from the fd when it queues the ioctx.\nThe completion of the FUSE_WRITE command from userspace causes the fuse\nserver to call the AIO completion function. The completion puts the\nstruct file, queuing a delayed fput to the fuse server task. When the\nfuse server task returns to userspace, it has to run the delayed fput,\nwhich in the case of a fuseblk server, it does synchronously.\n\nSending the FUSE_RELEASE command sychronously from fuse server threads\nis a bad idea because a client program can initiate enough simultaneous\nAIOs such that all the fuse server threads end up in delayed_fput, and\nnow there aren't any threads left to handle the queued fuse commands.\n\nFix this by only using asynchronous fputs when closing files, and leave\na comment explaining why.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":{ "$ref":"$.vulnerabilities[0].product_status.fixed" } }, "remediations":[ { "product_ids":{ "$ref":"$.vulnerabilities[0].product_status.fixed" }, "details":"kernel security update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1761" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"MEDIUM", "baseScore":4.7, "vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version":"3.1" }, "products":{ "$ref":"$.vulnerabilities[0].product_status.fixed" } } ], "threats":[ { "details":"Medium", "category":"impact" } ], "title":"CVE-2025-40220" } ] }