Linux Kernel up to 6.12.63/6.18.3/6.19-rc3 wifi trx.c rtl92cu_tx_fill_desc tids[] array index

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.63/6.18.3/6.19-rc3. It has been declared as critical. This issue affects the function rtl92cu_tx_fill_desc of the file drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c of the component wifi. Executing a manipulation of the argument tids[] can lead to array index. This vulnerability is handled as CVE-2025-71100. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.12.63/6.18.3/6.19-rc3. This vulnerability affects the function rtl92cu_tx_fill_desc of the file drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c of the component wifi. The manipulation of the argument tids[] with an unknown input leads to a array index vulnerability. The CWE definition for the vulnerability is CWE-129. The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: wifi: rtlwifi: 8192cu: fix tid out of range in rtl92cu_tx_fill_desc() TID getting from ieee80211_get_tid() might be out of range of array size of sta_entry->tids[], so check TID is less than MAX_TID_COUNT. Othwerwise, UBSAN warn: UBSAN: array-index-out-of-bounds in drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c:514:30 index 10 is out of range for type 'rtl_tid_data [9]'

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2025-71100 since 01/13/2026. 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 03/25/2026).

The vulnerability scanner Nessus provides a plugin with the ID 299777 (Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50112)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.64, 6.18.4 or 6.19-rc4 eliminates this vulnerability. Applying the patch 9765d6eb8298b07d499cdf9ef7c237d3540102d6/90a15ff324645aa806d81fa349497cd964861b66/dd39edb445f07400e748da967a07d5dca5c5f96e 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 (299777). 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: 7.9
VulDB Meta Temp Score: 7.7

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

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Array index
CWE: CWE-129 / 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: 299777
Nessus Name: Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50112)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.64/6.18.4/6.19-rc4
Patch: 9765d6eb8298b07d499cdf9ef7c237d3540102d6/90a15ff324645aa806d81fa349497cd964861b66/dd39edb445f07400e748da967a07d5dca5c5f96e

Timelineinfo

01/13/2026 Advisory disclosed
01/13/2026 +0 days CVE reserved
01/13/2026 +0 days VulDB entry created
03/25/2026 +71 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-71100 (🔒)
GCVE (CVE): GCVE-0-2025-71100
GCVE (VulDB): GCVE-100-340696

Entryinfo

Created: 01/13/2026 18:06
Updated: 03/25/2026 18:03
Changes: 01/13/2026 18:06 (61), 03/02/2026 13:22 (2), 03/25/2026 18:03 (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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