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CVE-2026-90325— blk-cgroup: skip dying blkg in blkcg_activate_policy()

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.

以下是该漏洞描述的中文翻译： 在 Linux 内核中，已解决以下漏洞： blk-cgroup：在 blkcg_activate_policy() 中跳过正在销毁的 blkg 当在块设备上切换 I/O 调度器时， 可能与并发的 blkcg 删除操作产生竞争条件，导致在 中发生 use-after-free（释放后使用）问题。 竞争场景示例： 修复方案： 在获取 blkg 的引用之前，先检查 。这与 中用于检测 blkg 是否已被销毁所用的检查一致。如果 blkg 已经未被哈希（unhashed），则跳过对该 blkg

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1210.002

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 81c1188905f88b77743d1fdeeedfc8cb7b67787d< b5dae1cd0d8368b4338430ff93403df67f0b8bcc affected
bfe46d2efe46c5c952f982e2ca94fe2ec5e58e2a< 083b58373463a6e5ee60ecb135269348f68ad7df affected
f1c006f1c6850c14040f8337753a63119bba39b9< 1a267295b1ea6a6477963f3fda84adfecd48fcad affected
f1c006f1c6850c14040f8337753a63119bba39b9< 7337d012ca3fc3a6a2d1c8e2a19c6d97c38b410d affected
f1c006f1c6850c14040f8337753a63119bba39b9< 3d8c3da95c75a4d312e272fc7b4076dd3ba9115c affected
f1c006f1c6850c14040f8337753a63119bba39b9< d8c872901e6459339374e9eea80aa919176c2ccd affected
f1c006f1c6850c14040f8337753a63119bba39b9< 5e9220389920f33b6a804d50c548cd0cd1b04634 affected
6.1.16< 6.1.17 affected
… +10 more rows
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I. Basic Information for CVE-2026-90325

Vulnerability Information
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Vulnerability Title
blk-cgroup: skip dying blkg in blkcg_activate_policy()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: skip dying blkg in blkcg_activate_policy() When switching IO schedulers on a block device, blkcg_activate_policy() can race with concurrent blkcg deletion, leading to a use-after-free in rcu_accelerate_cbs. T1: T2: blkg_destroy kill(&blkg->refcnt) // blkg->refcnt=1->0 blkg_release // call_rcu(__blkg_release) ... blkg_free_workfn ->pd_free_fn(pd) elv_iosched_store elevator_switch ... iterate blkg list blkg_get(blkg) // blkg->refcnt=0->1 list_del_init(&blkg->q_node) blkg_put(pinned_blkg) // blkg->refcnt=1->0 blkg_release // call_rcu again rcu_accelerate_cbs // uaf Fix this by checking hlist_unhashed(&blkg->blkcg_node) before getting a reference to the blkg. This is the same check used in blkg_destroy() to detect if a blkg has already been destroyed. If the blkg is already unhashed, skip processing it since it's being destroyed.
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-2026-90325

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III. Intelligence Information for CVE-2026-90325

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Patches & Fixes for CVE-2026-90325 (6)

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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