n 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.
Configuration 1 (hide)
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06 Feb 2026, 17:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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11 Dec 2025, 13:46
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/3d2af77e31ade05ff7ccc3658c3635ec1bea0979 - Patch | |
| References | () https://git.kernel.org/stable/c/abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2 - Patch | |
| References | () https://git.kernel.org/stable/c/b0d26283af612b9e0cc3188b0b88ad7fdea447e8 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| First Time |
Linux linux Kernel
Linux |
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| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | CWE-476 |
19 Sep 2025, 16:00
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Published : 2025-09-18 16:15
Updated : 2026-02-06 17:16
NVD link : CVE-2023-53421
Mitre link : CVE-2023-53421
CVE.ORG link : CVE-2023-53421
JSON object : View
NULL Pointer Dereference