// For flags

CVE-2021-47638

ubifs: rename_whiteout: Fix double free for whiteout_ui->data

Time Line
Published
2024-03-19
Updated
2024-03-19
Firt exploit
2024-03-19
Overview
Descriptions (1)
MITRE
CWE (0)
CAPEC (-)
Risk
CVSS Score
-
SSVC
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KEV
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EPSS
Affected Products (-)
Vendors (1)
linux
Products (1)
linux_kernel
Versions (8)
>= 4.9 < 4.14.276, >= 4.9 < 4.19.238, >= 4.9 < 5.4.189, >= 4.9 < 5.10.110, >= 4.9 < 5.15.33, >= 4.9 < 5.16.19, >= 4.9 < 5.17.2, >= 4.9 < 5.18
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References (9)
General (1)
kernel
Exploits & POcs (-)
Patches (8)
kernel
Advisories (-)
Summary
Descriptions

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).

*Credits: N/A
CVSS Scores
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Timeline
  • 2025-02-26 CVE Reserved
  • 2025-02-26 CVE Published
  • 2025-02-26 CVE Updated
  • ---------- EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
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Threat Intelligence Resources (0)
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Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
 Linux Kernel
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 >= 4.9 < 4.14.276
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en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.9 < 4.19.238
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 4.19.238"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.9 < 5.4.189
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en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.9 < 5.10.110
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 5.10.110"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.9 < 5.15.33
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en
Affected
Linux
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 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.9 < 5.16.19
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en
Affected
Linux
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 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.9 < 5.17.2
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en
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Linux
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 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.9 < 5.18
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en
Affected