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CVE-2026-92511— RDMA/core: Fix potential use after free in ib_destroy_cq_user()

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： RDMA/core：修复 ib_destroy_cq_user() 中潜在的释放后使用（use-after-free）问题 在通过 netlink 路径访问完成队列（CQ）时，对该 CQ 唯一的同步机制是 。目前， 在 的末尾才被调用，但这为时已晚，因为到那时与该 CQ 关联的供应商特定资源可能已经被释放。这会在一个短暂的时间窗口内导致 CQ 仍可通过 restrack 访问，从而引发潜在的释放后使用（use-after-free）错误。 修复方式 将 的调用移至 的开头，

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 08f294a1524bc3211a28091daa6c7513828c7d33< 42f7a0c7a94003059540cce448acabfa62ad119d affected
08f294a1524bc3211a28091daa6c7513828c7d33< 253c2ed71a532c70fa0e64317ceb02bb1a50c84c affected
08f294a1524bc3211a28091daa6c7513828c7d33< b85a148731eceffacb6a030950187d785175607f affected
08f294a1524bc3211a28091daa6c7513828c7d33< 197c262dbf94c0f7ab7ac54b66f892ce9f343232 affected
08f294a1524bc3211a28091daa6c7513828c7d33< 8a72a6aad84b3928dbb5e564bff1f56a7ec222ae affected
08f294a1524bc3211a28091daa6c7513828c7d33< 3481bec4dfc4aee24ffea5a547ee95b70b67d9d5 affected
4.16 affected
< 4.16 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-92511

Vulnerability Information
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Vulnerability Title
RDMA/core: Fix potential use after free in ib_destroy_cq_user()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in ib_destroy_cq_user() When accessing a CQ via the netlink path the only synchronization mechanism for the said CQ is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of ib_destroy_cq_user(), which is too late, since by that point vendor-specific resources associated with the CQ might already be freed. This can leave a short window where the CQ remains accessible through restrack, leading to a potential use-after-free. Fix this by moving the rdma_restrack_begin_del() call to the start of ib_destroy_cq_user(), ensuring that the CQ is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a CQ that is in the process of destruction. In addition, this change preserves the intended inverted order between create and destroy routines: resources are added to restrack at the end of successful creation, and hence shall be removed from the restrack first thing during the destruction flow, which keeps the lifecycle management consistent and predictable.
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 08f294a1524bc3211a28091daa6c7513828c7d33 ~ 42f7a0c7a94003059540cce448acabfa62ad119d -
Linux Linux 4.16 -

II. Public POCs for CVE-2026-92511

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III. Intelligence Information for CVE-2026-92511

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Patches & Fixes for CVE-2026-92511 (6)

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

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
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-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
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-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
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

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-92511

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