CVE-2023-53421

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Source
https://cve.org/CVERecord?id=CVE-2023-53421
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53421.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2023-53421
Downstream
Related
Published
2025-09-18T16:04:04.526Z
Modified
2026-03-11T07:46:09.657090Z
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
blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats()
Details

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

blk-cgroup: Reinit blkgiostatset after clearing in blkcgresetstats()

When blkgalloc() is called to allocate a blkcggq structure with the associated blkgiostatset's, there are 2 fields within blkgiostatset that requires proper initialization - blkg & sync. The former field was introduced by commit 3b8cc6298724 ("blk-cgroup: Optimize blkcgrstatflush()") while the later one was introduced by commit f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat").

Unfortunately those fields in the blkgiostatset's are not properly re-initialized when they are cleared in v1's blkcgresetstats(). This can lead to a kernel panic due to NULL pointer access of the blkg pointer. The missing initialization of sync is less problematic and can be a problem in a debug kernel due to missing lockdep initialization.

Fix these problems by re-initializing them after memory clearing.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53421.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f73316482977ac401ac37245c9df48079d4e11f3
Fixed
0561aa6033dd181594116d705c41fc16e97161a2
Fixed
892faa76be894d324bf48b12a55c7af7be2bad83
Fixed
b0d26283af612b9e0cc3188b0b88ad7fdea447e8
Fixed
abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2
Fixed
3d2af77e31ade05ff7ccc3658c3635ec1bea0979

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53421.json"