CVE-2021-47335

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47335
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47335.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47335
Related
Published
2024-05-21T15:15:20Z
Modified
2024-09-18T03:17:25.745904Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to avoid racing on fsyncentryslab by multi filesystem instances

As syzbot reported, there is an use-after-free issue during f2fs recovery:

Use-after-free write at 0xffff88823bc16040 (in kfence-#10): kmemcachedestroy+0x1f/0x120 mm/slabcommon.c:486 f2fsrecoverfsyncdata+0x75b0/0x8380 fs/f2fs/recovery.c:869 f2fsfillsuper+0x9393/0xa420 fs/f2fs/super.c:3945 mountbdev+0x26c/0x3a0 fs/super.c:1367 legacygettree+0xea/0x180 fs/fscontext.c:592 vfsgettree+0x86/0x270 fs/super.c:1497 donewmount fs/namespace.c:2905 [inline] pathmount+0x196f/0x2be0 fs/namespace.c:3235 domount fs/namespace.c:3248 [inline] _dosysmount fs/namespace.c:3456 [inline] _sesysmount+0x2f9/0x3b0 fs/namespace.c:3433 dosyscall64+0x3f/0xb0 arch/x86/entry/common.c:47 entrySYSCALL64afterhwframe+0x44/0xae

The root cause is multi f2fs filesystem instances can race on accessing global fsyncentryslab pointer, result in use-after-free issue of slab cache, fixes to init/destroy this slab cache only once during module init/destroy procedure to avoid this issue.

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
5.10.70-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+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
5.14.6-1

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
5.14.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}