Linux Kernel up to 6.19.3 RDMA rxe_srq_from_init double free

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.19.3. Affected is the function rxe_srq_from_init of the component RDMA. Executing a manipulation can lead to double free. This vulnerability is tracked as CVE-2026-45852. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.19.3. This vulnerability affects the function rxe_srq_from_init of the component RDMA. The manipulation with an unknown input leads to a double free vulnerability. The CWE definition for the vulnerability is CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix double free in rxe_srq_from_init In rxe_srq_from_init(), the queue pointer 'q' is assigned to 'srq->rq.queue' before copying the SRQ number to user space. If copy_to_user() fails, the function calls rxe_queue_cleanup() to free the queue, but leaves the now-invalid pointer in 'srq->rq.queue'. The caller of rxe_srq_from_init() (rxe_create_srq) eventually calls rxe_srq_cleanup() upon receiving the error, which triggers a second rxe_queue_cleanup() on the same memory, leading to a double free. The call trace looks like this: kmem_cache_free+0x.../0x... rxe_queue_cleanup+0x1a/0x30 [rdma_rxe] rxe_srq_cleanup+0x42/0x60 [rdma_rxe] rxe_elem_release+0x31/0x70 [rdma_rxe] rxe_create_srq+0x12b/0x1a0 [rdma_rxe] ib_create_srq_user+0x9a/0x150 [ib_core] Fix this by moving 'srq->rq.queue = q' after copy_to_user.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-45852 since 05/13/2026. The exploitation appears to be difficult. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/15/2026).

The vulnerability scanner Nessus provides a plugin with the ID 320531 (RHEL 8 : kernel (RHSA-2026:25121)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14 or 6.19.4 eliminates this vulnerability. Applying the patch 22b8c23a3b92d023614bb00896fe364b2c1a31d3/af5956243018918130d52c9f671efdb40bab3366/d286f0d4e3ad3caf5f0e673cdad7bf89bf37d947/26793db60925df1e88a29466813d586cbc190b8c/ce6f8e007682f378279d4cf83b240f12d52c723b/5c07aef09a121a4cd622a71eb0753a9e135c84a8/26a9cfe12f4ffdeaa136f252478986fa5f397ddc/0beefd0e15d962f497aad750b2d5e9c3570b66d1 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (320531) and CERT Bund (WID-SEC-2026-1700). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Siemens SIMATIC S7

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.1
VulDB Temp Score: 6.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

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: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 320531
Nessus Name: RHEL 8 : kernel (RHSA-2026:25121)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.252/5.15.202/6.1.165/6.6.128/6.12.75/6.18.14/6.19.4
Patch: 22b8c23a3b92d023614bb00896fe364b2c1a31d3/af5956243018918130d52c9f671efdb40bab3366/d286f0d4e3ad3caf5f0e673cdad7bf89bf37d947/26793db60925df1e88a29466813d586cbc190b8c/ce6f8e007682f378279d4cf83b240f12d52c723b/5c07aef09a121a4cd622a71eb0753a9e135c84a8/26a9cfe12f4ffdeaa136f252478986fa5f397ddc/0beefd0e15d962f497aad750b2d5e9c3570b66d1

Timelineinfo

05/13/2026 CVE reserved
05/27/2026 +14 days Advisory disclosed
05/27/2026 +0 days VulDB entry created
07/15/2026 +49 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-45852 (🔒)
GCVE (CVE): GCVE-0-2026-45852
GCVE (VulDB): GCVE-100-366112
CERT Bund: WID-SEC-2026-1700 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/27/2026 16:42
Updated: 07/15/2026 08:23
Changes: 05/27/2026 16:42 (59), 06/11/2026 23:18 (2), 06/14/2026 09:48 (7), 06/21/2026 03:55 (11), 06/22/2026 15:17 (1), 07/15/2026 08:23 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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