CVE-2021-47638 (GCVE-0-2021-47638)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2025-10-01 19:57
VLAI?
Title
ubifs: rename_whiteout: Fix double free for whiteout_ui->data
Summary
In the Linux kernel, the following vulnerability has been resolved: ubifs: rename_whiteout: Fix double free for whiteout_ui->data 'whiteout_ui->data' will be freed twice if space budget fail for rename whiteout operation as following process: rename_whiteout dev = kmalloc whiteout_ui->data = dev kfree(whiteout_ui->data) // Free first time iput(whiteout) ubifs_free_inode kfree(ui->data) // Double free! KASAN reports: ================================================================== BUG: KASAN: double-free or invalid-free in ubifs_free_inode+0x4f/0x70 Call Trace: kfree+0x117/0x490 ubifs_free_inode+0x4f/0x70 [ubifs] i_callback+0x30/0x60 rcu_do_batch+0x366/0xac0 __do_softirq+0x133/0x57f Allocated by task 1506: kmem_cache_alloc_trace+0x3c2/0x7a0 do_rename+0x9b7/0x1150 [ubifs] ubifs_rename+0x106/0x1f0 [ubifs] do_syscall_64+0x35/0x80 Freed by task 1506: kfree+0x117/0x490 do_rename.cold+0x53/0x8a [ubifs] ubifs_rename+0x106/0x1f0 [ubifs] do_syscall_64+0x35/0x80 The buggy address belongs to the object at ffff88810238bed8 which belongs to the cache kmalloc-8 of size 8 ================================================================== Let ubifs_free_inode() free 'whiteout_ui->data'. BTW, delete unused assignment 'whiteout_ui->data_len = 0', process 'ubifs_evict_inode() -> ubifs_jnl_delete_inode() -> ubifs_jnl_write_inode()' doesn't need it (because 'inc_nlink(whiteout)' won't be excuted by 'goto out_release', and the nlink of whiteout inode is 0).
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798 , < 8b3c7be16f3f4dfd6e15ac651484e59d3fa36274 (git)
Affected: 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798 , < 2b3236ecf96db7af5836e1366ce39ace8ce832fa (git)
Affected: 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798 , < 14276d38c89a170363e90b6ac0a53c3cf61b87fc (git)
Affected: 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798 , < a90e2dbe66d2647ff95a0442ad2e86482d977fd8 (git)
Affected: 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798 , < 2ad07009c459e56ebdcc089d850d664660fdb742 (git)
Affected: 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798 , < b9a937f096e608b3368c1abc920d4d640ba2c94f (git)
Affected: 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798 , < 6d7a158a7363c1f6604aa47ae1a280a5c65123dd (git)
Affected: 9e0a1fff8db56eaaebb74b4a3ef65f86811c4798 , < 40a8f0d5e7b3999f096570edab71c345da812e3e (git)
Create a notification for this product.
    Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 4.14.276 , ≤ 4.14.* (semver)
Unaffected: 4.19.238 , ≤ 4.19.* (semver)
Unaffected: 5.4.189 , ≤ 5.4.* (semver)
Unaffected: 5.10.110 , ≤ 5.10.* (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: rename_whiteout: Fix double free for whiteout_ui-\u003edata\n\n\u0027whiteout_ui-\u003edata\u0027 will be freed twice if space budget fail for\nrename whiteout operation as following process:\n\nrename_whiteout\n  dev = kmalloc\n  whiteout_ui-\u003edata = dev\n  kfree(whiteout_ui-\u003edata)  // Free first time\n  iput(whiteout)\n    ubifs_free_inode\n      kfree(ui-\u003edata)\t    // Double free!\n\nKASAN reports:\n==================================================================\nBUG: KASAN: double-free or invalid-free in ubifs_free_inode+0x4f/0x70\nCall Trace:\n  kfree+0x117/0x490\n  ubifs_free_inode+0x4f/0x70 [ubifs]\n  i_callback+0x30/0x60\n  rcu_do_batch+0x366/0xac0\n  __do_softirq+0x133/0x57f\n\nAllocated by task 1506:\n  kmem_cache_alloc_trace+0x3c2/0x7a0\n  do_rename+0x9b7/0x1150 [ubifs]\n  ubifs_rename+0x106/0x1f0 [ubifs]\n  do_syscall_64+0x35/0x80\n\nFreed by task 1506:\n  kfree+0x117/0x490\n  do_rename.cold+0x53/0x8a [ubifs]\n  ubifs_rename+0x106/0x1f0 [ubifs]\n  do_syscall_64+0x35/0x80\n\nThe buggy address belongs to the object at ffff88810238bed8 which\nbelongs to the cache kmalloc-8 of size 8\n==================================================================\n\nLet ubifs_free_inode() free \u0027whiteout_ui-\u003edata\u0027. BTW, delete unused\nassignment \u0027whiteout_ui-\u003edata_len = 0\u0027, process \u0027ubifs_evict_inode()\n-\u003e ubifs_jnl_delete_inode() -\u003e ubifs_jnl_write_inode()\u0027 doesn\u0027t need it\n(because \u0027inc_nlink(whiteout)\u0027 won\u0027t be excuted by \u0027goto out_release\u0027,\n and the nlink of whiteout inode is 0)."
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    "dateUpdated": "2025-10-01T19:57:08.545Z",
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\"version\": \"5.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ubifs/dir.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8b3c7be16f3f4dfd6e15ac651484e59d3fa36274\"}, {\"url\": \"https://git.kernel.org/stable/c/2b3236ecf96db7af5836e1366ce39ace8ce832fa\"}, {\"url\": \"https://git.kernel.org/stable/c/14276d38c89a170363e90b6ac0a53c3cf61b87fc\"}, {\"url\": \"https://git.kernel.org/stable/c/a90e2dbe66d2647ff95a0442ad2e86482d977fd8\"}, {\"url\": \"https://git.kernel.org/stable/c/2ad07009c459e56ebdcc089d850d664660fdb742\"}, {\"url\": \"https://git.kernel.org/stable/c/b9a937f096e608b3368c1abc920d4d640ba2c94f\"}, {\"url\": \"https://git.kernel.org/stable/c/6d7a158a7363c1f6604aa47ae1a280a5c65123dd\"}, {\"url\": \"https://git.kernel.org/stable/c/40a8f0d5e7b3999f096570edab71c345da812e3e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nubifs: rename_whiteout: Fix double free for whiteout_ui-\u003edata\\n\\n\u0027whiteout_ui-\u003edata\u0027 will be freed twice if space budget fail for\\nrename whiteout operation as following process:\\n\\nrename_whiteout\\n  dev = kmalloc\\n  whiteout_ui-\u003edata = dev\\n  kfree(whiteout_ui-\u003edata)  // Free first time\\n  iput(whiteout)\\n    ubifs_free_inode\\n      kfree(ui-\u003edata)\\t    // Double free!\\n\\nKASAN reports:\\n==================================================================\\nBUG: KASAN: double-free or invalid-free in ubifs_free_inode+0x4f/0x70\\nCall Trace:\\n  kfree+0x117/0x490\\n  ubifs_free_inode+0x4f/0x70 [ubifs]\\n  i_callback+0x30/0x60\\n  rcu_do_batch+0x366/0xac0\\n  __do_softirq+0x133/0x57f\\n\\nAllocated by task 1506:\\n  kmem_cache_alloc_trace+0x3c2/0x7a0\\n  do_rename+0x9b7/0x1150 [ubifs]\\n  ubifs_rename+0x106/0x1f0 [ubifs]\\n  do_syscall_64+0x35/0x80\\n\\nFreed by task 1506:\\n  kfree+0x117/0x490\\n  do_rename.cold+0x53/0x8a [ubifs]\\n  ubifs_rename+0x106/0x1f0 [ubifs]\\n  do_syscall_64+0x35/0x80\\n\\nThe buggy address belongs to the object at ffff88810238bed8 which\\nbelongs to the cache kmalloc-8 of size 8\\n==================================================================\\n\\nLet ubifs_free_inode() free \u0027whiteout_ui-\u003edata\u0027. BTW, delete unused\\nassignment \u0027whiteout_ui-\u003edata_len = 0\u0027, process \u0027ubifs_evict_inode()\\n-\u003e ubifs_jnl_delete_inode() -\u003e ubifs_jnl_write_inode()\u0027 doesn\u0027t need it\\n(because \u0027inc_nlink(whiteout)\u0027 won\u0027t be excuted by \u0027goto out_release\u0027,\\n and the nlink of whiteout inode is 0).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.276\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.238\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.189\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.110\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.33\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.19\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.2\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:15:17.543Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47638\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T19:57:08.545Z\", \"dateReserved\": \"2025-02-26T01:48:21.519Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T01:54:11.178Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • 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.
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  • 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.



Detection rules are retrieved from Rulezet.