{"id":"CVE-2026-53041","summary":"ocfs2: fix listxattr handling when the buffer is full","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix listxattr handling when the buffer is full\n\n[BUG]\nIf an OCFS2 inode has both inline and block-based xattrs, listxattr()\ncan return a size larger than the caller's buffer when the inline names\nconsume that buffer exactly.\n\nkernel BUG at mm/usercopy.c:102!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:usercopy_abort+0xb7/0xd0 mm/usercopy.c:102\nCall Trace:\n __check_heap_object+0xe3/0x120 mm/slub.c:8243\n check_heap_object mm/usercopy.c:196 [inline]\n __check_object_size mm/usercopy.c:250 [inline]\n __check_object_size+0x5c5/0x780 mm/usercopy.c:215\n check_object_size include/linux/ucopysize.h:22 [inline]\n check_copy_size include/linux/ucopysize.h:59 [inline]\n copy_to_user include/linux/uaccess.h:219 [inline]\n listxattr+0xb0/0x170 fs/xattr.c:926\n filename_listxattr fs/xattr.c:958 [inline]\n path_listxattrat+0x137/0x320 fs/xattr.c:988\n __do_sys_listxattr fs/xattr.c:1001 [inline]\n __se_sys_listxattr fs/xattr.c:998 [inline]\n __x64_sys_listxattr+0x7f/0xd0 fs/xattr.c:998\n ...\n\n[CAUSE]\nCommit 936b8834366e (\"ocfs2: Refactor xattr list and remove\nocfs2_xattr_handler().\") replaced the old per-handler list accounting\nwith ocfs2_xattr_list_entry(), but it kept using size == 0 to detect\nprobe mode.\n\nThat assumption stops being true once ocfs2_listxattr() finishes the\ninline-xattr pass. If the inline names fill the caller buffer exactly,\nthe block-xattr pass runs with a non-NULL buffer and a remaining size of\nzero. ocfs2_xattr_list_entry() then skips the bounds check, keeps\ncounting block names, and returns a positive size larger than the\nsupplied buffer.\n\n[FIX]\nDetect probe mode by testing whether the destination buffer pointer is\nNULL instead of whether the remaining size is zero.\n\nThat restores the pre-refactor behavior and matches the OCFS2 getxattr\nhelpers. Once the remaining buffer reaches zero while more names are\nleft, the block-xattr pass now returns -ERANGE instead of reporting a\nsize larger than the allocated list buffer.","modified":"2026-07-14T09:29:39.966048358Z","published":"2026-06-24T16:29:47.501Z","related":["SUSE-SU-2026:22521-1","SUSE-SU-2026:22522-1","SUSE-SU-2026:2799-1","SUSE-SU-2026:2800-1","SUSE-SU-2026:2840-1","SUSE-SU-2026:2841-1","SUSE-SU-2026:2914-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53041.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2323084c17370304f49c84b354fe7b3edbb264fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2685df8577a38d83b367c8cf52eda9dc286959ff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/46e66fefb83811958127bc9ad736983ec629d82b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/50033ec1350fe68abdc63b950ced7ae57364b77a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6f702b00b8124c5d3525f19172934544826a114d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a35a1c2b170b5b578b1b3fecb95694796552af9a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d12f558e6200b3f47dbef9331ed6d115d2410e59"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d919b905939eda93393e3572900ff70dbad2b47f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53041.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53041"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"936b8834366ec05f2a6993f73afd8348cac9718e"},{"fixed":"a35a1c2b170b5b578b1b3fecb95694796552af9a"},{"fixed":"2323084c17370304f49c84b354fe7b3edbb264fe"},{"fixed":"6f702b00b8124c5d3525f19172934544826a114d"},{"fixed":"d919b905939eda93393e3572900ff70dbad2b47f"},{"fixed":"46e66fefb83811958127bc9ad736983ec629d82b"},{"fixed":"2685df8577a38d83b367c8cf52eda9dc286959ff"},{"fixed":"50033ec1350fe68abdc63b950ced7ae57364b77a"},{"fixed":"d12f558e6200b3f47dbef9331ed6d115d2410e59"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53041.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.28"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.141"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53041.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}