blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-53421
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-18 16:15:45 UTC
Updated2026-06-01 17:16:25 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats() When blkg_alloc() is called to allocate a blkcg_gq structure with the associated blkg_iostat_set's, there are 2 fields within blkg_iostat_set that requires proper initialization - blkg & sync. The former field was introduced by commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()") while the later one was introduced by commit f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat"). Unfortunately those fields in the blkg_iostat_set's are not properly re-initialized when they are cleared in v1's blkcg_reset_stats(). 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476 | CWE-476 CWE-476 NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f73316482977ac401ac37245c9df48079d4e11f3 58c135513562698f222a58ba07dbdfcfb268aa0d git Not specified
CNA Linux Linux affected f73316482977ac401ac37245c9df48079d4e11f3 0561aa6033dd181594116d705c41fc16e97161a2 git Not specified
CNA Linux Linux affected f73316482977ac401ac37245c9df48079d4e11f3 892faa76be894d324bf48b12a55c7af7be2bad83 git Not specified
CNA Linux Linux affected f73316482977ac401ac37245c9df48079d4e11f3 b0d26283af612b9e0cc3188b0b88ad7fdea447e8 git Not specified
CNA Linux Linux affected f73316482977ac401ac37245c9df48079d4e11f3 abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2 git Not specified
CNA Linux Linux affected f73316482977ac401ac37245c9df48079d4e11f3 3d2af77e31ade05ff7ccc3658c3635ec1bea0979 git Not specified
CNA Linux Linux affected 5.5 Not specified
CNA Linux Linux unaffected 5.5 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.199 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.162 6.1.* semver Not specified
CNA Linux Linux unaffected 6.3.13 6.3.* semver Not specified
CNA Linux Linux unaffected 6.4.4 6.4.* semver Not specified
CNA Linux Linux unaffected 6.5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/892faa76be894d324bf48b12a55c7af7be2bad83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3d2af77e31ade05ff7ccc3658c3635ec1bea0979 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/58c135513562698f222a58ba07dbdfcfb268aa0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0d26283af612b9e0cc3188b0b88ad7fdea447e8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0561aa6033dd181594116d705c41fc16e97161a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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