{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53041",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53041"
  ],
  "published": "2026-06-24T16:31:02Z",
  "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53041"
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      "scenario": "AV:L - The vulnerable OCFS2 code is reached through local `listxattr`/`llistxattr`/`flistxattr`/`listxattrat` syscalls where the caller controls the too-small buffer size. Network wrappers such as nfsd and ksmbd probe and allocate the full xattr-list size, so they do not expose the short-buffer trigger.\nAC:L - The attacker can deterministically create the needed inline-plus-block xattr layout on a writable OCFS2 file using `user.*` xattrs, then pass a buffer size that exactly fits the inline names. No race or external timing condition is required.\nPR:L - A basic local unprivileged user with access to a writable OCFS2 file or directory can create `user.*` xattrs and invoke `listxattr`. Creating/mounting the filesystem may require administrator setup, but exploitation on an affected deployed system does not require real root.\nUI:N - Once the attacker has local access to the OCFS2 path, exploitation is performed directly with syscalls. No separate victim action is needed.\nS:U - The issue affects kernel filesystem handling within the same host security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug returns a length larger than the allocated kernel xattr-list buffer, causing `copy_to_user` to attempt an out-of-bounds kernel heap read. With hardened usercopy this aborts, but without it or under weaker checking this can expose kernel memory, so confidentiality is high.\nI:N - The flaw is an oversized read/copy length and does not write beyond bounds or corrupt kernel objects. It does not provide a direct integrity modification primitive.\nA:H - On hardened-usercopy kernels the overlong `copy_to_user` triggers `usercopy_abort()` and `BUG()`, producing a kernel oops/panic. The crash is repeatable by the local attacker."
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}