DEBIAN-CVE-2021-47638

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Source
https://security-tracker.debian.org/tracker/CVE-2021-47638
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47638.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2021-47638
Upstream
Published
2025-02-26T06:37:05Z
Modified
2025-09-30T05:16:43.238752Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved: ubifs: renamewhiteout: Fix double free for whiteoutui->data 'whiteoutui->data' will be freed twice if space budget fail for rename whiteout operation as following process: renamewhiteout dev = kmalloc whiteoutui->data = dev kfree(whiteoutui->data) // Free first time iput(whiteout) ubifsfreeinode kfree(ui->data) // Double free! KASAN reports: ================================================================== BUG: KASAN: double-free or invalid-free in ubifsfreeinode+0x4f/0x70 Call Trace: kfree+0x117/0x490 ubifsfreeinode+0x4f/0x70 [ubifs] icallback+0x30/0x60 rcudobatch+0x366/0xac0 _dosoftirq+0x133/0x57f Allocated by task 1506: kmemcachealloctrace+0x3c2/0x7a0 dorename+0x9b7/0x1150 [ubifs] ubifsrename+0x106/0x1f0 [ubifs] dosyscall64+0x35/0x80 Freed by task 1506: kfree+0x117/0x490 dorename.cold+0x53/0x8a [ubifs] ubifsrename+0x106/0x1f0 [ubifs] dosyscall64+0x35/0x80 The buggy address belongs to the object at ffff88810238bed8 which belongs to the cache kmalloc-8 of size 8 ================================================================== Let ubifsfreeinode() free 'whiteoutui->data'. BTW, delete unused assignment 'whiteoutui->datalen = 0', process 'ubifsevictinode() -> ubifsjnldeleteinode() -> ubifsjnlwriteinode()' doesn't need it (because 'incnlink(whiteout)' won't be excuted by 'goto out_release', and the nlink of whiteout inode is 0).

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.113-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1
5.10.84-1
5.10.92-1~bpo10+1
5.10.92-1
5.10.92-2
5.10.103-1~bpo10+1
5.10.103-1
5.10.106-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.17.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.17.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.17.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}