{"id":"CVE-2022-50755","title":"udf: Avoid double brelse() in udf_rename()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nudf: Avoid double brelse() in udf_rename()\n\nsyzbot reported a warning like below [1]:\n\nVFS: brelse: Trying to free free buffer\nWARNING: CPU: 2 PID: 7301 at fs/buffer.c:…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 78eba2778ae10fb2a9d450e14d26eb6f6bf1f906","Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 9d2cad69547abea961fa80426d600b861de1952b","Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < d6da7ec0f94f5208c848e0e94b70f54a0bd9c587","Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 156d440dea97deada629bb51cb17887abd862605","Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 40dba68d418237b1ae2beaa06d46a94dd946278e","Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < e7a6a53c871460727be09f4414ccb29fb8697526","Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 4fca09045509f5bde8fc28e68fbca38cb4bdcf2e","Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 090bf49833c51da297ec74f98ad2bf44daea9311","Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < c791730f2554a9ebb8f18df9368dc27d4ebc38c2","Linux 4.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:32:25.959553Z"},"published":"2025-12-24","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:41:23.768Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50755","references":[{"url":"https://git.kernel.org/stable/c/78eba2778ae10fb2a9d450e14d26eb6f6bf1f906"},{"url":"https://git.kernel.org/stable/c/9d2cad69547abea961fa80426d600b861de1952b"},{"url":"https://git.kernel.org/stable/c/d6da7ec0f94f5208c848e0e94b70f54a0bd9c587"},{"url":"https://git.kernel.org/stable/c/156d440dea97deada629bb51cb17887abd862605"},{"url":"https://git.kernel.org/stable/c/40dba68d418237b1ae2beaa06d46a94dd946278e"},{"url":"https://git.kernel.org/stable/c/e7a6a53c871460727be09f4414ccb29fb8697526"},{"url":"https://git.kernel.org/stable/c/4fca09045509f5bde8fc28e68fbca38cb4bdcf2e"},{"url":"https://git.kernel.org/stable/c/090bf49833c51da297ec74f98ad2bf44daea9311"},{"url":"https://git.kernel.org/stable/c/c791730f2554a9ebb8f18df9368dc27d4ebc38c2"}],"tags":["cve.org"],"epss":0.00211,"epssPercentile":0.10623,"ingestedAt":"2026-10-15T22:48:25.382Z","slug":"CVE-2022-50755","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nudf: Avoid double brelse() in udf_rename()\n\nsyzbot reported a warning like below [1]:\n\nVFS: brelse: Trying to free free buffer\nWARNING: CPU: 2 PID: 7301 at fs/buffer.c:1145 __brelse+0x67/0xa0\n...\nCall Trace:\n <TASK>\n invalidate_bh_lru+0x99/0x150\n smp_call_function_many_cond+0xe2a/0x10c0\n ? generic_remap_file_range_prep+0x50/0x50\n ? __brelse+0xa0/0xa0\n ? __mutex_lock+0x21c/0x12d0\n ? smp_call_on_cpu+0x250/0x250\n ? rcu_read_lock_sched_held+0xb/0x60\n ? lock_release+0x587/0x810\n ? __brelse+0xa0/0xa0\n ? generic_remap_file_range_prep+0x50/0x50\n on_each_cpu_cond_mask+0x3c/0x80\n blkdev_flush_mapping+0x13a/0x2f0\n blkdev_put_whole+0xd3/0xf0\n blkdev_put+0x222/0x760\n deactivate_locked_super+0x96/0x160\n deactivate_super+0xda/0x100\n cleanup_mnt+0x222/0x3d0\n task_work_run+0x149/0x240\n ? task_work_cancel+0x30/0x30\n do_exit+0xb29/0x2a40\n ? reacquire_held_locks+0x4a0/0x4a0\n ? do_raw_spin_lock+0x12a/0x2b0\n ? mm_update_next_owner+0x7c0/0x7c0\n ? rwlock_bug.part.0+0x90/0x90\n ? zap_other_threads+0x234/0x2d0\n do_group_exit+0xd0/0x2a0\n __x64_sys_exit_group+0x3a/0x50\n do_syscall_64+0x34/0xb0\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe cause of the issue is that brelse() is called on both ofibh.sbh\nand ofibh.ebh by udf_find_entry() when it returns NULL.  However,\nbrelse() is called by udf_rename(), too.  So, b_count on buffer_head\nbecomes unbalanced.\n\nThis patch fixes the issue by not calling brelse() by udf_rename()\nwhen udf_find_entry() returns NULL.\n\n## Affected\n\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 78eba2778ae10fb2a9d450e14d26eb6f6bf1f906`\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 9d2cad69547abea961fa80426d600b861de1952b`\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < d6da7ec0f94f5208c848e0e94b70f54a0bd9c587`\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 156d440dea97deada629bb51cb17887abd862605`\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 40dba68d418237b1ae2beaa06d46a94dd946278e`\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < e7a6a53c871460727be09f4414ccb29fb8697526`\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 4fca09045509f5bde8fc28e68fbca38cb4bdcf2e`\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 090bf49833c51da297ec74f98ad2bf44daea9311`\n- `Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < c791730f2554a9ebb8f18df9368dc27d4ebc38c2`\n- `Linux 4.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}