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CVE-2023-53421— blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于blkg_iostat_set结构在blkcg_reset_stats中清除后未重新初始化blkg和sync字段，可能导致空指针访问或锁调试问题。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux f73316482977ac401ac37245c9df48079d4e11f3< 58c135513562698f222a58ba07dbdfcfb268aa0d affected
f73316482977ac401ac37245c9df48079d4e11f3< 0561aa6033dd181594116d705c41fc16e97161a2 affected
f73316482977ac401ac37245c9df48079d4e11f3< 892faa76be894d324bf48b12a55c7af7be2bad83 affected
f73316482977ac401ac37245c9df48079d4e11f3< b0d26283af612b9e0cc3188b0b88ad7fdea447e8 affected
f73316482977ac401ac37245c9df48079d4e11f3< abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2 affected
f73316482977ac401ac37245c9df48079d4e11f3< 3d2af77e31ade05ff7ccc3658c3635ec1bea0979 affected
5.5 affected
< 5.5 unaffected
… +6 more rows
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I. Basic Information for CVE-2023-53421

Vulnerability Information
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Vulnerability Title
blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats()
Source: CVE Program / CVE List V5
Vulnerability Description
In 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于blkg_iostat_set结构在blkcg_reset_stats中清除后未重新初始化blkg和sync字段，可能导致空指针访问或锁调试问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f73316482977ac401ac37245c9df48079d4e11f3 ~ 58c135513562698f222a58ba07dbdfcfb268aa0d -
Linux Linux 5.5 -

II. Public POCs for CVE-2023-53421

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III. Intelligence Information for CVE-2023-53421

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Patches & Fixes for CVE-2023-53421 (1)

Same Patch Batch · Linux · 2025-09-18 · 121 CVEs total

CVE-2023-53382 9.8 CRITICAL net/smc: Reset connection when trying to use SMCRv2 fails.
CVE-2022-50401 9.8 CRITICAL nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure
CVE-2022-50410 9.8 CRITICAL NFSD: Protect against send buffer overflow in NFSv2 READ
CVE-2022-50413 8.8 HIGH wifi: mac80211: fix use-after-free
CVE-2022-50419 8.8 HIGH Bluetooth: hci_sysfs: Fix attempting to call device_add multiple times
CVE-2023-53374 8.8 HIGH Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early
CVE-2022-50386 8.8 HIGH Bluetooth: L2CAP: Fix user-after-free
CVE-2023-53431 8.8 HIGH scsi: ses: Handle enclosure with just a primary component gracefully
CVE-2023-53432 8.8 HIGH firewire: net: fix use after free in fwnet_finish_incoming_packet()
CVE-2023-53372 8.2 HIGH sctp: fix a potential overflow in sctp_ifwdtsn_skip
CVE-2023-53398 7.8 HIGH mlx5: fix possible ptp queue fifo use-after-free
CVE-2023-53426 7.8 HIGH xsk: Fix xsk_diag use-after-free error during socket cleanup
CVE-2023-53378 7.8 HIGH drm/i915/dpt: Treat the DPT BO as a framebuffer
CVE-2023-53377 7.8 HIGH cifs: prevent use-after-free by freeing the cfile later
CVE-2023-53376 7.8 HIGH scsi: mpi3mr: Use number of bits to manage bitmap sizes
CVE-2023-53373 7.8 HIGH crypto: seqiv - Handle EBUSY correctly
CVE-2023-53429 7.8 HIGH btrfs: don't check PageError in __extent_writepage
CVE-2022-50399 7.8 HIGH media: atomisp: prevent integer overflow in sh_css_set_black_frame()
CVE-2022-50411 7.8 HIGH ACPICA: Fix error code path in acpi_ds_call_control_method()
CVE-2022-50384 7.8 HIGH staging: vme_user: Fix possible UAF in tsi148_dma_list_add

Showing top 20 of 121 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53421

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