CVE-2023-53421
- 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
- 2026-05-28T03:53:28.334351120Z
- 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
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53421.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/stable/c/0561aa6033dd181594116d705c41fc16e97161a2
- https://git.kernel.org/stable/c/3d2af77e31ade05ff7ccc3658c3635ec1bea0979
- https://git.kernel.org/stable/c/892faa76be894d324bf48b12a55c7af7be2bad83
- https://git.kernel.org/stable/c/abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2
- https://git.kernel.org/stable/c/b0d26283af612b9e0cc3188b0b88ad7fdea447e8
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53421.json
- https://nvd.nist.gov/vuln/detail/CVE-2023-53421
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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
-
Introducedf73316482977ac401ac37245c9df48079d4e11f3Fixed0561aa6033dd181594116d705c41fc16e97161a2Fixed892faa76be894d324bf48b12a55c7af7be2bad83Fixedb0d26283af612b9e0cc3188b0b88ad7fdea447e8Fixedabbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2Fixed3d2af77e31ade05ff7ccc3658c3635ec1bea0979