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CVE-2026-93795— blk-cgroup: fix leaks and online flag on radix_tree_insert failure

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.

在 Linux 内核中，已修复以下漏洞： blk-cgroup：修复 radix_tree_insert() 失败时的内存泄漏及 online 标志处理问题 当 中调用 失败时，错误处理路径存在两个问题： 1. 无论 blkio 组控制组（blkg）是否从未被完全插入， 都被无条件设置为 true。应将该赋值操作移至成功处理的代码块中。 2. 错误处理路径在调用 之前未先调用 。由于引用计数仍处于每 CPU（percpu）模式， 仅执行 操作，而未检查计数是否为零，因此永远不会触发 。这将导致永久泄漏 blkg 内

AI Predicted 5.5 Difficulty: Easy EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1610 · Deploy Container

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 7fcf2b033b84e261dca283bc2911aaea4b07b525< 0f840db042caee9d2f3dcdcf97d6674f6e4c1e30 affected
7fcf2b033b84e261dca283bc2911aaea4b07b525< f53945d7c712efe63fadbcc5ffed6370871fd0d3 affected
7fcf2b033b84e261dca283bc2911aaea4b07b525< ada8270ccdb6f212da5eb22614c28ea418746a4a affected
7fcf2b033b84e261dca283bc2911aaea4b07b525< c3650be82ef6e7af13b79b2d10a7363bdf54aa7f affected
7fcf2b033b84e261dca283bc2911aaea4b07b525< 6e85f02d45b5977c0326a8d854c6db878aa6b34a affected
7fcf2b033b84e261dca283bc2911aaea4b07b525< 4c0d150fb98ea40760611979f4e664c244b20966 affected
7fcf2b033b84e261dca283bc2911aaea4b07b525< dbbca20764382b4d411ec2918f4e278ffe547acc affected
5.0 affected
… +8 more rows
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I. Basic Information for CVE-2026-93795

Vulnerability Information
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Vulnerability Title
blk-cgroup: fix leaks and online flag on radix_tree_insert failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix leaks and online flag on radix_tree_insert failure When radix_tree_insert() fails in blkg_create(), the error path has two issues: 1. blkg->online is set to true unconditionally, even when the blkg was never fully inserted. Move the assignment inside the success block. 2. The error path calls blkg_put() without first calling percpu_ref_kill(). Because the refcount is still in percpu mode, percpu_ref_put() only does this_cpu_sub() without checking for zero, so blkg_release() is never triggered. This permanently leaks the blkg memory, its percpu iostat, policy data, the parent blkg reference, and the cgroup css reference — the latter preventing the cgroup from ever being destroyed. Fix by replacing blkg_put() with percpu_ref_kill(), matching the pattern used in blkg_destroy().
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7fcf2b033b84e261dca283bc2911aaea4b07b525 ~ 0f840db042caee9d2f3dcdcf97d6674f6e4c1e30 -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-93795

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III. Intelligence Information for CVE-2026-93795

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Patches & Fixes for CVE-2026-93795 (7)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93224 8.1 HIGH svcrdma: Fix unmatched rn_unregister on failed accept
CVE-2026-93787 8.1 HIGH smb: client: bound dirent name against end of SMB response in cifs_filldir

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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