CVE-2021-47493

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47493
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47493.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47493
Related
Published
2024-05-22T09:15:11Z
Modified
2024-09-18T03:17:28.978678Z
Summary
[none]
Details

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

ocfs2: fix race between searching chunks and release journalhead from bufferhead

Encountered a race between ocfs2testbgbitallocatable() and jbd2journalputjournalhead() resulting in the below vmcore.

PID: 106879 TASK: ffff880244ba9c00 CPU: 2 COMMAND: "loop3" Call trace: panic oopsend nocontext _badareanosemaphore badareanosemaphore _dopagefault dopagefault pagefault [exception RIP: ocfs2blockgroupfindclearbits+316] ocfs2blockgroupfindclearbits [ocfs2] ocfs2clustergroupsearch [ocfs2] ocfs2searchchain [ocfs2] ocfs2claimsuballocbits [ocfs2] _ocfs2claimclusters [ocfs2] ocfs2claimclusters [ocfs2] ocfs2localallocslidewindow [ocfs2] ocfs2reservelocalallocbits [ocfs2] ocfs2reserveclusterswithlimit [ocfs2] ocfs2reserveclusters [ocfs2] ocfs2lockrefcountallocators [ocfs2] ocfs2makeclusterswritable [ocfs2] ocfs2replacecow [ocfs2] ocfs2refcountcow [ocfs2] ocfs2filewriteiter [ocfs2] lorwaio loopqueuework kthreadworkerfn kthread retfrom_fork

When ocfs2testbgbitallocatable() called bh2jh(bgbh), the bgbh->bprivate NULL as jbd2journalputjournalhead() raced and released the jounal head from the buffer head. Needed to take bit lock for the bit 'BHJournalHead' to fix this race.

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
5.10.84-1

Affected versions

5.*

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

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
5.15.3-1

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
5.15.3-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}