CVE-2021-47493
- Source
- https://cve.org/CVERecord?id=CVE-2021-47493
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47493.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-47493
- Downstream
- Related
- Published
- 2024-05-22T09:15:11.100Z
- Modified
- 2026-03-13T05:18:11.618599Z
- Severity
-
- 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/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:
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] ocfs2claimsuballoc_bits [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 retfromfork
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
Git /
Database specific
unresolved_ranges
[
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.10.77"
}
]
},
{
"events": [
{
"introduced": "5.11"
},
{
"fixed": "5.14.16"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc1"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc2"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc3"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc5"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc6"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc7"
}
]
}
]
source
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47493.json"