Linux Kernel up to 7.2.5 RDMA/core ib_destroy_cq_user use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. This affects the function ib_destroy_cq_user of the component RDMA/core. Performing a manipulation results in use after free. This vulnerability is cataloged as CVE-2026-92511. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. This affects the function ib_destroy_cq_user of the component RDMA/core. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-92511 since 09/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 42f7a0c7a94003059540cce448acabfa62ad119d/253c2ed71a532c70fa0e64317ceb02bb1a50c84c/b85a148731eceffacb6a030950187d785175607f/197c262dbf94c0f7ab7ac54b66f892ce9f343232/8a72a6aad84b3928dbb5e564bff1f56a7ec222ae/3481bec4dfc4aee24ffea5a547ee95b70b67d9d5 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 42f7a0c7a94003059540cce448acabfa62ad119d/253c2ed71a532c70fa0e64317ceb02bb1a50c84c/b85a148731eceffacb6a030950187d785175607f/197c262dbf94c0f7ab7ac54b66f892ce9f343232/8a72a6aad84b3928dbb5e564bff1f56a7ec222ae/3481bec4dfc4aee24ffea5a547ee95b70b67d9d5

Timelineinfo

09/16/2026 CVE reserved
09/17/2026 +1 days Advisory disclosed
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-92511 (🔒)
GCVE (CVE): GCVE-0-2026-92511
GCVE (VulDB): GCVE-100-407019

Entryinfo

Created: 09/17/2026 22:37
Changes: 09/17/2026 22:37 (59)
Complete: 🔍
Cache ID: 216::103

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