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CVE-2026-90326— blk-cgroup: fix race between policy activation and blkg destruction

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：修复策略激活与 blkg 销毁之间的竞态条件 当在块设备上切换 IO 调度器时， 会为连接到该队列的所有 blkg 分配 (pd)。然而， 可能与并发的 blkcg 删除操作发生竞态，从而导致释放后使用（use-after-free）和内存泄漏问题。 释放后使用的竞态场景如下： 线程 T1 ( )： 成功为 （ , ）分配了 pd。 为 （ , ）分配 pd 失败。 进入 ENOMEM 回滚路径，以释放 的相关资源。 线程 T2 (blkcg 删除)：

CVSS 7.8 · High EPSS 0.17% · P6

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 81c1188905f88b77743d1fdeeedfc8cb7b67787d< b5dae1cd0d8368b4338430ff93403df67f0b8bcc affected
bfe46d2efe46c5c952f982e2ca94fe2ec5e58e2a< 083b58373463a6e5ee60ecb135269348f68ad7df affected
f1c006f1c6850c14040f8337753a63119bba39b9< ac34e655dffa74349d885a43d098115336f53842 affected
f1c006f1c6850c14040f8337753a63119bba39b9< 2cf9f50a38c1839e549a08e22aa35e8d69e2c8fd affected
f1c006f1c6850c14040f8337753a63119bba39b9< 5313d4d41739b0cb63000747c97bb1217ac45f3e affected
6.1.16< 6.1.17 affected
6.2.3< 6.2.4 affected
6.3 affected
… +6 more rows
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I. Basic Information for CVE-2026-90326

Vulnerability Information
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Vulnerability Title
blk-cgroup: fix race between policy activation and blkg destruction
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix race between policy activation and blkg destruction When switching an IO scheduler on a block device, blkcg_activate_policy() allocates blkg_policy_data (pd) for all blkgs attached to the queue. However, blkcg_activate_policy() may race with concurrent blkcg deletion, leading to use-after-free and memory leak issues. The use-after-free occurs in the following race: T1 (blkcg_activate_policy): - Successfully allocates pd for blkg1 (loop0->queue, blkcgA) - Fails to allocate pd for blkg2 (loop0->queue, blkcgB) - Enters the enomem rollback path to release blkg1 resources T2 (blkcg deletion): - blkcgA is deleted concurrently - blkg1 is freed via blkg_free_workfn() - blkg1->pd is freed T1 (continued): - Rollback path accesses blkg1->pd->online after pd is freed - Triggers use-after-free In addition, blkg_free_workfn() frees pd before removing the blkg from q->blkg_list. This allows blkcg_activate_policy() to allocate a new pd for a blkg that is being destroyed, leaving the newly allocated pd unreachable when the blkg is finally freed. Fix these races by extending blkcg_mutex coverage to serialize blkcg_activate_policy() rollback and blkg destruction, ensuring pd lifecycle is synchronized with blkg list visibility.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 81c1188905f88b77743d1fdeeedfc8cb7b67787d ~ b5dae1cd0d8368b4338430ff93403df67f0b8bcc -
Linux Linux 6.3 -

II. Public POCs for CVE-2026-90326

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III. Intelligence Information for CVE-2026-90326

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Patches & Fixes for CVE-2026-90326 (4)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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