{"id":"CVE-2022-50755","revision":null,"records":[{"revision":"bc7c8bf018c04711bf154e7a5a9e157b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2022-50755","aliases":[],"title":"udf: Avoid double brelse() in udf_rename()","description":"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:1145 __brelse+0x67/0xa0\n...\nCall Trace:\n \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.","state":0,"publishedAt":"2025-12-24T13:05:48.928+00:00","modifiedAt":"2026-10-15T21:41:23.768+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/udf/namei.c\"\n ],\n \"versions\": [\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"78eba2778ae10fb2a9d450e14d26eb6f6bf1f906\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"9d2cad69547abea961fa80426d600b861de1952b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"d6da7ec0f94f5208c848e0e94b70f54a0bd9c587\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"156d440dea97deada629bb51cb17887abd862605\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"40dba68d418237b1ae2beaa06d46a94dd946278e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"e7a6a53c871460727be09f4414ccb29fb8697526\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"4fca09045509f5bde8fc28e68fbca38cb4bdcf2e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"090bf49833c51da297ec74f98ad2bf44daea9311\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\",\n \"lessThan\": \"c791730f2554a9ebb8f18df9368dc27d4ebc38c2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/udf/namei.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.2\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.2\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.9.337\",\n \"lessThanOrEqual\": \"4.9.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.14.303\",\n \"lessThanOrEqual\": \"4.14.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.270\",\n \"lessThanOrEqual\": \"4.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.229\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.163\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.86\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.0.16\",\n \"lessThanOrEqual\": \"6.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.2\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/78eba2778ae10fb2a9d450e14d26eb6f6bf1f906","https://git.kernel.org/stable/c/9d2cad69547abea961fa80426d600b861de1952b","https://git.kernel.org/stable/c/d6da7ec0f94f5208c848e0e94b70f54a0bd9c587","https://git.kernel.org/stable/c/156d440dea97deada629bb51cb17887abd862605","https://git.kernel.org/stable/c/40dba68d418237b1ae2beaa06d46a94dd946278e","https://git.kernel.org/stable/c/e7a6a53c871460727be09f4414ccb29fb8697526","https://git.kernel.org/stable/c/4fca09045509f5bde8fc28e68fbca38cb4bdcf2e","https://git.kernel.org/stable/c/090bf49833c51da297ec74f98ad2bf44daea9311","https://git.kernel.org/stable/c/c791730f2554a9ebb8f18df9368dc27d4ebc38c2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50755","license":"CVE Program Terms of Use","key":"cve-program:CVE-2022-50755","identifiers":["CVE-2022-50755"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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