Linux Kernel up to 7.2.5 RDMA-core ib_free_cq 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 categorized as very critical has been discovered in Linux Kernel up to 7.2.5. Impacted is the function ib_free_cq of the component RDMA-core. The manipulation results in use after free. This vulnerability is identified as CVE-2026-92508. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.5. Affected is the function ib_free_cq 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. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-92508 since 09/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/17/2026).

Upgrading to version 5.15.221, 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 a804b162f9bc2b38b2ed1b4752eea9faadb1645b/91f8a17a22ab615a03743120e19935e731f28fb9/76f2cb4f721815c3b6262a6dc2151de88646924c/b8dcca427096fc9c50f1b376847fea72bc842d31/9abea37942534eeb049335476178696b654b000c/43403fe45379c64fa6276e5a8ede44493e5d2d3d/29dc2f8e1c97372c2871a70088707933515fbd5b is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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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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💳💳💳💳💳💳
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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 5.15.221/6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: a804b162f9bc2b38b2ed1b4752eea9faadb1645b/91f8a17a22ab615a03743120e19935e731f28fb9/76f2cb4f721815c3b6262a6dc2151de88646924c/b8dcca427096fc9c50f1b376847fea72bc842d31/9abea37942534eeb049335476178696b654b000c/43403fe45379c64fa6276e5a8ede44493e5d2d3d/29dc2f8e1c97372c2871a70088707933515fbd5b

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-2026-92508 (🔒)
GCVE (CVE): GCVE-0-2026-92508
GCVE (VulDB): GCVE-100-407016

Entryinfo

Created: 09/17/2026 22:36
Changes: 09/17/2026 22:36 (59)
Complete: 🔍
Cache ID: 216::103

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