Linux Kernel up to 6.6.139/6.12.85/6.18.26/7.0.3 rxe payload_size privilege escalation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.139/6.12.85/6.18.26/7.0.3 and classified as critical. The affected element is the function payload_size of the component rxe. Executing a manipulation can lead to an unknown weakness. This vulnerability appears as CVE-2026-46043. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.6.139/6.12.85/6.18.26/7.0.3. This vulnerability affects the function payload_size of the component rxe. 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: Validate pad and ICRC before payload_size() in rxe_rcv rxe_rcv() currently checks only that the incoming packet is at least header_size(pkt) bytes long before payload_size() is used. However, payload_size() subtracts both the attacker-controlled BTH pad field and RXE_ICRC_SIZE from pkt->paylen: payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt) - RXE_ICRC_SIZE This means a short packet can still make payload_size() underflow even if it includes enough bytes for the fixed headers. Simply requiring header_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a packet with a forged non-zero BTH pad can still leave payload_size() negative and pass an underflowed value to later receive-path users. Fix this by validating pkt->paylen against the full minimum length required by payload_size(): header_size(pkt) + bth_pad(pkt) + RXE_ICRC_SIZE.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-46043 since 05/13/2026. 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 06/17/2026).

The vulnerability scanner Nessus provides a plugin with the ID 321065 (SUSE SLES15 Security Update : kernel (SUSE-SU-2026:2310-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.140, 6.12.86, 6.18.27, 7.0.4 or 7.1-rc1 eliminates this vulnerability. Applying the patch 2fd4f8b749309a61c3f3f88ee8891d94f79e1240/f83519a4c122c9c7a850a2197648a9ff4c67c520/9b924f3a26b21330a837cfe72e819b6393bbeeaa/e8ee0e792d475b1067c199ef0af1b6221fa6f43d/7244491dab347f648e661da96dc0febadd9daec3 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 vulnerability database at Tenable (321065). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.3

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.1
CNA Vector (Linux): 🔒

CVSSv2info

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

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321065
Nessus Name: SUSE SLES15 Security Update : kernel (SUSE-SU-2026:2310-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.140/6.12.86/6.18.27/7.0.4/7.1-rc1
Patch: 2fd4f8b749309a61c3f3f88ee8891d94f79e1240/f83519a4c122c9c7a850a2197648a9ff4c67c520/9b924f3a26b21330a837cfe72e819b6393bbeeaa/e8ee0e792d475b1067c199ef0af1b6221fa6f43d/7244491dab347f648e661da96dc0febadd9daec3

Timelineinfo

05/13/2026 CVE reserved
05/27/2026 +14 days Advisory disclosed
05/27/2026 +0 days VulDB entry created
06/17/2026 +21 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-46043 (🔒)
GCVE (CVE): GCVE-0-2026-46043
GCVE (VulDB): GCVE-100-366328

Entryinfo

Created: 05/27/2026 18:35
Updated: 06/17/2026 02:29
Changes: 05/27/2026 18:35 (58), 06/14/2026 23:51 (2), 06/17/2026 02:29 (11)
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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