Linux Kernel up to 6.1.161/6.6.122/6.12.68/6.18.8 t7xx_dpmaif_set_frag_to_skb frags[] buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.161/6.6.122/6.12.68/6.18.8. It has been classified as critical. This affects the function t7xx_dpmaif_set_frag_to_skb. This manipulation of the argument frags[] causes buffer overflow. This vulnerability is tracked as CVE-2026-23172. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.161/6.6.122/6.12.68/6.18.8. It has been declared as critical. Affected by this vulnerability is the function t7xx_dpmaif_set_frag_to_skb. The manipulation of the argument frags[] with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: fix potential skb->frags overflow in RX path When receiving data in the DPMAIF RX path, the t7xx_dpmaif_set_frag_to_skb() function adds page fragments to an skb without checking if the number of fragments has exceeded MAX_SKB_FRAGS. This could lead to a buffer overflow in skb_shinfo(skb)->frags[] array, corrupting adjacent memory and potentially causing kernel crashes or other undefined behavior. This issue was identified through static code analysis by comparing with a similar vulnerability fixed in the mt76 driver commit b102f0c522cf ("mt76: fix array overflow on receiving too many fragments for a packet"). The vulnerability could be triggered if the modem firmware sends packets with excessive fragments. While under normal protocol conditions (MTU 3080 bytes, BAT buffer 3584 bytes), a single packet should not require additional fragments, the kernel should not blindly trust firmware behavior. Malicious, buggy, or compromised firmware could potentially craft packets with more fragments than the kernel expects. Fix this by adding a bounds check before calling skb_add_rx_frag() to ensure nr_frags does not exceed MAX_SKB_FRAGS. The check must be performed before unmapping to avoid a page leak and double DMA unmap during device teardown.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-23172 since 01/13/2026. The exploitation appears to be easy. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/05/2026).

The vulnerability scanner Nessus provides a plugin with the ID 299343 (Linux Distros Unpatched Vulnerability : CVE-2026-23172), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.162, 6.6.123, 6.12.69 or 6.18.9 eliminates this vulnerability. Applying the patch f9747a7521a48afded5bff2faf1f2dcfff48c577/2a0522f564acd34442652ea083091c329fa7c5d5/af4b8577d0b388cc3d0039eb0cdd9ca5bbbc9276/2c0fb0f60bc1545c52da61bc6bd4855c1e7814ba/f0813bcd2d9d97fdbdf2efb9532ab03ae92e99e6 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 (299343) and CERT Bund (WID-SEC-2026-0421). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • IBM QRadar SIEM

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

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

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / 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: 299343
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23172

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.162/6.6.123/6.12.69/6.18.9
Patch: f9747a7521a48afded5bff2faf1f2dcfff48c577/2a0522f564acd34442652ea083091c329fa7c5d5/af4b8577d0b388cc3d0039eb0cdd9ca5bbbc9276/2c0fb0f60bc1545c52da61bc6bd4855c1e7814ba/f0813bcd2d9d97fdbdf2efb9532ab03ae92e99e6

Timelineinfo

01/13/2026 CVE reserved
02/14/2026 +32 days Advisory disclosed
02/14/2026 +0 days VulDB entry created
05/05/2026 +80 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23172 (🔒)
GCVE (CVE): GCVE-0-2026-23172
GCVE (VulDB): GCVE-100-346057
CERT Bund: WID-SEC-2026-0421 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 02/14/2026 18:10
Updated: 05/05/2026 19:29
Changes: 02/14/2026 18:10 (59), 02/19/2026 13:04 (1), 02/20/2026 07:15 (2), 03/19/2026 06:12 (11), 04/13/2026 05:34 (7), 05/05/2026 19:29 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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