Linux Kernel up to 6.19.3 RDMA siw_get_hdr null pointer dereference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.5$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.19.3. This affects the function siw_get_hdr of the component RDMA. Such manipulation leads to null pointer dereference. This vulnerability is traded as CVE-2026-23242. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.19.3. Affected by this issue is the function siw_get_hdr of the component RDMA. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix potential NULL pointer dereference in header processing If siw_get_hdr() returns -EINVAL before set_rx_fpdu_context(), qp->rx_fpdu can be NULL. The error path in siw_tcp_rx_data() dereferences qp->rx_fpdu->more_ddp_segs without checking, which may lead to a NULL pointer deref. Only check more_ddp_segs when rx_fpdu is present. KASAN splat: [ 101.384271] KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] [ 101.385869] RIP: 0010:siw_tcp_rx_data+0x13ad/0x1e50

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-23242 since 01/13/2026. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 302913 (Linux Distros Unpatched Vulnerability : CVE-2026-23242), 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, 6.19.4 or 7.0-rc1 eliminates this vulnerability. Applying the patch ab61841633d10e56a58c1493a262f0d02dba2f5e/8564dcc12fbb372d984ab45768cae9335777b274/ab957056192d6bd068b3759cb2077d859cca01f0/ffba40b67663567481fa8a1ed5d2da36897c175d/87b7a036d2c73d5bb3ae2d47dee23de465db3355/714c99e1dc8f85f446e05be02ba83972e981a817/ce025f7f5d070596194315eb2e4e89d568b8a755/14ab3da122bd18920ad57428f6cf4fade8385142 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 (302913), EUVD (EUVD-2026-12801) and CERT Bund (WID-SEC-2026-0774). Once again VulDB remains the best source for vulnerability data.

Affected

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

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (Linux): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 302913
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23242

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.252/5.15.202/6.1.165/6.6.128/6.12.75/6.18.14/6.19.4/7.0-rc1
Patch: ab61841633d10e56a58c1493a262f0d02dba2f5e/8564dcc12fbb372d984ab45768cae9335777b274/ab957056192d6bd068b3759cb2077d859cca01f0/ffba40b67663567481fa8a1ed5d2da36897c175d/87b7a036d2c73d5bb3ae2d47dee23de465db3355/714c99e1dc8f85f446e05be02ba83972e981a817/ce025f7f5d070596194315eb2e4e89d568b8a755/14ab3da122bd18920ad57428f6cf4fade8385142

Timelineinfo

01/13/2026 CVE reserved
03/18/2026 +64 days Advisory disclosed
03/18/2026 +0 days VulDB entry created
06/24/2026 +97 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23242 (🔒)
GCVE (CVE): GCVE-0-2026-23242
GCVE (VulDB): GCVE-100-351524
EUVD: 🔒
CERT Bund: WID-SEC-2026-0774 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/18/2026 12:00
Updated: 06/24/2026 01:43
Changes: 03/18/2026 12:00 (59), 03/18/2026 12:24 (1), 03/18/2026 14:48 (7), 03/19/2026 13:05 (2), 04/29/2026 20:08 (1), 05/21/2026 22:07 (12), 06/24/2026 01:43 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!