CVE-2026-53041 (GCVE-0-2026-53041)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-28 06:38
VLAI
Title
ocfs2: fix listxattr handling when the buffer is full
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.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 936b8834366ec05f2a6993f73afd8348cac9718e , < a35a1c2b170b5b578b1b3fecb95694796552af9a (git)
Affected: 936b8834366ec05f2a6993f73afd8348cac9718e , < 2323084c17370304f49c84b354fe7b3edbb264fe (git)
Affected: 936b8834366ec05f2a6993f73afd8348cac9718e , < 6f702b00b8124c5d3525f19172934544826a114d (git)
Affected: 936b8834366ec05f2a6993f73afd8348cac9718e , < d919b905939eda93393e3572900ff70dbad2b47f (git)
Affected: 936b8834366ec05f2a6993f73afd8348cac9718e , < 46e66fefb83811958127bc9ad736983ec629d82b (git)
Affected: 936b8834366ec05f2a6993f73afd8348cac9718e , < 2685df8577a38d83b367c8cf52eda9dc286959ff (git)
Affected: 936b8834366ec05f2a6993f73afd8348cac9718e , < 50033ec1350fe68abdc63b950ced7ae57364b77a (git)
Affected: 936b8834366ec05f2a6993f73afd8348cac9718e , < d12f558e6200b3f47dbef9331ed6d115d2410e59 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.28
Unaffected: 0 , < 2.6.28 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Show details on NVD website

{
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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."
        }
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            "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"
          }
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-28T06:38:23.107Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/a35a1c2b170b5b578b1b3fecb95694796552af9a"
        },
        {
          "url": "https://git.kernel.org/stable/c/2323084c17370304f49c84b354fe7b3edbb264fe"
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        {
          "url": "https://git.kernel.org/stable/c/6f702b00b8124c5d3525f19172934544826a114d"
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          "url": "https://git.kernel.org/stable/c/d919b905939eda93393e3572900ff70dbad2b47f"
        },
        {
          "url": "https://git.kernel.org/stable/c/46e66fefb83811958127bc9ad736983ec629d82b"
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          "url": "https://git.kernel.org/stable/c/2685df8577a38d83b367c8cf52eda9dc286959ff"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d12f558e6200b3f47dbef9331ed6d115d2410e59"
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      "title": "ocfs2: fix listxattr handling when the buffer is full",
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  "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": "2026-06-28T06:38:23.107Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-53041",
      "date": "2026-07-02",
      "epss": "0.00126",
      "percentile": "0.0259"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53041\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:15.830\",\"lastModified\":\"2026-06-28T08:16:30.773\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/xattr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"936b8834366ec05f2a6993f73afd8348cac9718e\",\"lessThan\":\"a35a1c2b170b5b578b1b3fecb95694796552af9a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"936b8834366ec05f2a6993f73afd8348cac9718e\",\"lessThan\":\"2323084c17370304f49c84b354fe7b3edbb264fe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"936b8834366ec05f2a6993f73afd8348cac9718e\",\"lessThan\":\"6f702b00b8124c5d3525f19172934544826a114d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"936b8834366ec05f2a6993f73afd8348cac9718e\",\"lessThan\":\"d919b905939eda93393e3572900ff70dbad2b47f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"936b8834366ec05f2a6993f73afd8348cac9718e\",\"lessThan\":\"46e66fefb83811958127bc9ad736983ec629d82b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"936b8834366ec05f2a6993f73afd8348cac9718e\",\"lessThan\":\"2685df8577a38d83b367c8cf52eda9dc286959ff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"936b8834366ec05f2a6993f73afd8348cac9718e\",\"lessThan\":\"50033ec1350fe68abdc63b950ced7ae57364b77a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"936b8834366ec05f2a6993f73afd8348cac9718e\",\"lessThan\":\"d12f558e6200b3f47dbef9331ed6d115d2410e59\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/xattr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.28\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.28\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2323084c17370304f49c84b354fe7b3edbb264fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2685df8577a38d83b367c8cf52eda9dc286959ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/46e66fefb83811958127bc9ad736983ec629d82b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/50033ec1350fe68abdc63b950ced7ae57364b77a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f702b00b8124c5d3525f19172934544826a114d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a35a1c2b170b5b578b1b3fecb95694796552af9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d12f558e6200b3f47dbef9331ed6d115d2410e59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d919b905939eda93393e3572900ff70dbad2b47f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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