Linux Kernel up to 6.12.107/6.18.48/7.1.12/7.2.2 RDMA/rxe rxe_resp.c rxe_qp_from_attr/rxe_receiver use after free

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.13

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.12.107/6.18.48/7.1.12/7.2.2 and classified as problematic. Impacted is the function rxe_qp_from_attr/rxe_receiver of the file rxe_resp.c of the component RDMA/rxe. The manipulation leads to use after free. This vulnerability is referenced as CVE-2026-80864. The attack can only be performed from a local environment. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.107/6.18.48/7.1.12/7.2.2 and classified as problematic. This issue affects the function rxe_qp_from_attr/rxe_receiver of the file rxe_resp.c of the component RDMA/rxe. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp rxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the IB_QP_STATE path, so it holds no state_lock and runs while the responder task rxe_receiver() (recv_task on rxe_wq) is live. A modify_qp() setting only that attribute calls free_rd_atomic_resources() then alloc_rd_atomic_resources(), swapping qp->resp.resources[] while rxe_prepare_res()/find_resource() walk it; free_rd_atomic_resources() also leaves the cached pointer qp->resp.res dangling. A local unprivileged user can race the free/realloc into a use-after-free in rxe_receiver() (local DoS). Drain recv_task around the swap with rxe_disable_task()/rxe_enable_task(), as rxe_qp_reset() already does when tearing this array down, re-enabling only after alloc_rd_atomic_resources() succeeds so the responder never resumes against a NULL qp->resp.resources on the ENOMEM path. Also clear qp->resp.res in free_rd_atomic_resources(), like the rxe_resp.c completion paths. Reproduced under KASAN; the slab-use-after-free in rxe_receiver() is gone.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-80864 since 08/26/2026. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/04/2026).

Upgrading to version 6.12.108, 6.18.49, 7.1.13, 7.2.3 or 7.3-rc1 eliminates this vulnerability. Applying the patch 0136b528b753c5a56e4d997ef20b86bb6750b8fb/ffa4f0be69656be1755090f02db38d49816585c6/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844/60dfd47929cd1e7070daa810d40ce538d888410d/6f7014237405e7f032b5c53a82d9eccf6161c291 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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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
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: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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 6.12.108/6.18.49/7.1.13/7.2.3/7.3-rc1
Patch: 0136b528b753c5a56e4d997ef20b86bb6750b8fb/ffa4f0be69656be1755090f02db38d49816585c6/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844/60dfd47929cd1e7070daa810d40ce538d888410d/6f7014237405e7f032b5c53a82d9eccf6161c291

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80864 (🔒)
GCVE (CVE): GCVE-0-2026-80864
GCVE (VulDB): GCVE-100-398975

Entryinfo

Created: 09/04/2026 18:39
Changes: 09/04/2026 18:39 (60)
Complete: 🔍
Cache ID: 216::103

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