CVE-2023-52982

{"id": "CVE-2023-52982", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-03-27T17:15:45.437", "references": [{"url": "https://git.kernel.org/stable/c/3be069f42a7b79d3149194f21cdf24bf23864cac", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8226e37d82f43657da34dd770e2b38f20242ada7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfscache: Use wait_on_bit() to wait for the freeing of relinquished volume\n\nThe freeing of relinquished volume will wake up the pending volume\nacquisition by using wake_up_bit(), however it is mismatched with\nwait_var_event() used in fscache_wait_on_volume_collision() and it will\nnever wake up the waiter in the wait-queue because these two functions\noperate on different wait-queues.\n\nAccording to the implementation in fscache_wait_on_volume_collision(),\nif the wake-up of pending acquisition is delayed longer than 20 seconds\n(e.g., due to the delay of on-demand fd closing), the first\nwait_var_event_timeout() will timeout and the following wait_var_event()\nwill hang forever as shown below:\n\n FS-Cache: Potential volume collision new=00000024 old=00000022\n ......\n INFO: task mount:1148 blocked for more than 122 seconds.\n Not tainted 6.1.0-rc6+ #1\n task:mount state:D stack:0 pid:1148 ppid:1\n Call Trace:\n <TASK>\n __schedule+0x2f6/0xb80\n schedule+0x67/0xe0\n fscache_wait_on_volume_collision.cold+0x80/0x82\n __fscache_acquire_volume+0x40d/0x4e0\n erofs_fscache_register_volume+0x51/0xe0 [erofs]\n erofs_fscache_register_fs+0x19c/0x240 [erofs]\n erofs_fc_fill_super+0x746/0xaf0 [erofs]\n vfs_get_super+0x7d/0x100\n get_tree_nodev+0x16/0x20\n erofs_fc_get_tree+0x20/0x30 [erofs]\n vfs_get_tree+0x24/0xb0\n path_mount+0x2fa/0xa90\n do_mount+0x7c/0xa0\n __x64_sys_mount+0x8b/0xe0\n do_syscall_64+0x30/0x60\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nConsidering that wake_up_bit() is more selective, so fix it by using\nwait_on_bit() instead of wait_var_event() to wait for the freeing of\nrelinquished volume. In addition because waitqueue_active() is used in\nwake_up_bit() and clear_bit() doesn't imply any memory barrier, use\nclear_and_wake_up_bit() to add the missing memory barrier between\ncursor->flags and waitqueue_active()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fscache: utilice wait_on_bit() para esperar la liberaci\u00f3n del volumen cedido. La liberaci\u00f3n del volumen cedido activar\u00e1 la adquisici\u00f3n de volumen pendiente mediante wake_up_bit(), sin embargo no coincide con wait_var_event() utilizado en fscache_wait_on_volume_collision() y nunca activar\u00e1 al que espera en la cola de espera porque estas dos funciones operan en colas de espera diferentes. Seg\u00fan la implementaci\u00f3n en fscache_wait_on_volume_collision(), si la activaci\u00f3n de una adquisici\u00f3n pendiente se demora m\u00e1s de 20 segundos (por ejemplo, debido a la demora en el cierre del fd a pedido), el primer wait_var_event_timeout() expirar\u00e1 y el siguiente wait_var_event() se colgar\u00e1 para siempre como se muestra a continuaci\u00f3n: FS-Cache: Potencial colisi\u00f3n de volumen nuevo=00000024 antiguo=00000022 ...... INFORMACI\u00d3N: montaje de tarea: 1148 bloqueado durante m\u00e1s de 122 segundos. No contaminado 6.1.0-rc6+ #1 task:mount state:D stack:0 pid:1148 ppid:1 Call Trace: __schedule+0x2f6/0xb80 schedule+0x67/0xe0 fscache_wait_on_volume_collision.cold+0x80/0x82 __fscache_acquire_volume+0x40d/0x4e0 erofs_fscache_register_volume+0x51/0xe0 [erofs] erofs_fscache_register_fs+0x19c/0x240 [erofs] erofs_fc_fill_super+0x746/0xaf0 [erofs] vfs_get_super+0x7d/0x100 get_tree_nodev+0x16/0x20 erofs_fc_get_tree+0x20/0x30 [erofs] vfs_get_tree+0x24/0xb0 path_mount+0x2fa/0xa90 do_mount+0x7c/0xa0 __x64_sys_mount+0x8b/0xe0 do_syscall_64+0x30/0x60 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Considering that wake_up_bit() es m\u00e1s selectivo, corr\u00edjalo utilizando wait_on_bit() en lugar de wait_var_event() para esperar la liberaci\u00f3n del volumen cedido. Adem\u00e1s, debido a que waitqueue_active() se usa en wake_up_bit() y clear_bit() no implica ninguna barrera de memoria, use clear_and_wake_up_bit() para agregar la barrera de memoria faltante entre cursor-&gt;flags y waitqueue_active()."}], "lastModified": "2025-10-28T18:22:24.060", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15D484CF-DA6C-44F0-9BCE-F29F5D48ABE2", "versionEndExcluding": "6.1.11", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FF501633-2F44-4913-A8EE-B021929F49F6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2BDA597B-CAC1-4DF0-86F0-42E142C654E9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "725C78C9-12CE-406F-ABE8-0813A01D66E8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A127C155-689C-4F67-B146-44A57F4BFD85"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D34127CC-68F5-4703-A5F6-5006F803E4AE"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AB8D555-648E-4F2F-98BD-3E7F45BD12A8"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}