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CVE-2026-92508— RDMA/core: Fix potential use after free in ib_free_cq()

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_free_cq() 中潜在的使用后释放（use-after-free）问题 当通过 netlink 路径访问 CQ（完成队列，Completion Queue）时，对该 CQ 的唯一同步机制是 。 目前， 在 的末尾被调用，但此时为时已晚，因为与 CQ 关联的厂商特定资源可能在此之前已被释放。这会导致一个短暂的时间窗口，在此期间 CQ 仍可通过 restrack 访问，从而引发潜在的使用后释放问题。 修复方法：将 的调用移至厂商特定资源释放之

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 43d781b9fa562f0c6e50f62c870fbfeb9dc85213< a804b162f9bc2b38b2ed1b4752eea9faadb1645b affected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213< 91f8a17a22ab615a03743120e19935e731f28fb9 affected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213< 76f2cb4f721815c3b6262a6dc2151de88646924c affected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213< b8dcca427096fc9c50f1b376847fea72bc842d31 affected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213< 9abea37942534eeb049335476178696b654b000c affected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213< 43403fe45379c64fa6276e5a8ede44493e5d2d3d affected
43d781b9fa562f0c6e50f62c870fbfeb9dc85213< 29dc2f8e1c97372c2871a70088707933515fbd5b affected
7ac277a01f9017fcde4f3f81670c995992945433 affected
… +12 more rows
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I. Basic Information for CVE-2026-92508

Vulnerability Information
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Vulnerability Title
RDMA/core: Fix potential use after free in ib_free_cq()
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_free_cq() 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_free_cq(), 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_del() call to be before the freeing of the vendor-specific resources 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.
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 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 ~ a804b162f9bc2b38b2ed1b4752eea9faadb1645b -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-92508

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III. Intelligence Information for CVE-2026-92508

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Patches & Fixes for CVE-2026-92508 (7)

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

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