CVE-2026-53041 (GCVE-0-2026-53041)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-08-05 12:32
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix listxattr handling when the buffer is full [BUG] If an OCFS2 inode has both inline and block-based xattrs, listxattr() can return a size larger than the caller's buffer when the inline names consume that buffer exactly. kernel BUG at mm/usercopy.c:102! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI RIP: 0010:usercopy_abort+0xb7/0xd0 mm/usercopy.c:102 Call Trace: __check_heap_object+0xe3/0x120 mm/slub.c:8243 check_heap_object mm/usercopy.c:196 [inline] __check_object_size mm/usercopy.c:250 [inline] __check_object_size+0x5c5/0x780 mm/usercopy.c:215 check_object_size include/linux/ucopysize.h:22 [inline] check_copy_size include/linux/ucopysize.h:59 [inline] copy_to_user include/linux/uaccess.h:219 [inline] listxattr+0xb0/0x170 fs/xattr.c:926 filename_listxattr fs/xattr.c:958 [inline] path_listxattrat+0x137/0x320 fs/xattr.c:988 __do_sys_listxattr fs/xattr.c:1001 [inline] __se_sys_listxattr fs/xattr.c:998 [inline] __x64_sys_listxattr+0x7f/0xd0 fs/xattr.c:998 ... [CAUSE] Commit 936b8834366e ("ocfs2: Refactor xattr list and remove ocfs2_xattr_handler().") replaced the old per-handler list accounting with ocfs2_xattr_list_entry(), but it kept using size == 0 to detect probe mode. That assumption stops being true once ocfs2_listxattr() finishes the inline-xattr pass. If the inline names fill the caller buffer exactly, the block-xattr pass runs with a non-NULL buffer and a remaining size of zero. ocfs2_xattr_list_entry() then skips the bounds check, keeps counting block names, and returns a positive size larger than the supplied buffer. [FIX] Detect probe mode by testing whether the destination buffer pointer is NULL instead of whether the remaining size is zero. That restores the pre-refactor behavior and matches the OCFS2 getxattr helpers. Once the remaining buffer reaches zero while more names are left, the block-xattr pass now returns -ERANGE instead of reporting a size larger than the allocated list buffer.
References
Impacted products
Vendor Product Version
Linux Linux Version: 936b8834366ec05f2a6993f73afd8348cac9718e
Version: 936b8834366ec05f2a6993f73afd8348cac9718e
Version: 936b8834366ec05f2a6993f73afd8348cac9718e
Version: 936b8834366ec05f2a6993f73afd8348cac9718e
Version: 936b8834366ec05f2a6993f73afd8348cac9718e
Version: 936b8834366ec05f2a6993f73afd8348cac9718e
Version: 936b8834366ec05f2a6993f73afd8348cac9718e
Version: 936b8834366ec05f2a6993f73afd8348cac9718e
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/xattr.c"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:49.657Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a35a1c2b170b5b578b1b3fecb95694796552af9a"
        },
        {
          "url": "https://git.kernel.org/stable/c/2323084c17370304f49c84b354fe7b3edbb264fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f702b00b8124c5d3525f19172934544826a114d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d919b905939eda93393e3572900ff70dbad2b47f"
        },
        {
          "url": "https://git.kernel.org/stable/c/46e66fefb83811958127bc9ad736983ec629d82b"
        },
        {
          "url": "https://git.kernel.org/stable/c/2685df8577a38d83b367c8cf52eda9dc286959ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/50033ec1350fe68abdc63b950ced7ae57364b77a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d12f558e6200b3f47dbef9331ed6d115d2410e59"
        }
      ],
      "title": "ocfs2: fix listxattr handling when the buffer is full",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53041",
    "datePublished": "2026-06-24T16:29:47.501Z",
    "dateReserved": "2026-06-09T07:44:35.380Z",
    "dateUpdated": "2026-08-05T12:32:49.657Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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