Linux Kernel up to 6.6.113/6.12.54/6.17.4/6.18-rc1 qaic find_and_map_user_pages privilege escalation

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.6.113/6.12.54/6.17.4/6.18-rc1. Affected is the function find_and_map_user_pages of the component qaic. Performing a manipulation results in an unknown weakness. This vulnerability was named CVE-2025-40172. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.113/6.12.54/6.17.4/6.18-rc1. It has been classified as critical. This affects the function find_and_map_user_pages of the component qaic. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages() Currently, if find_and_map_user_pages() takes a DMA xfer request from the user with a length field set to 0, or in a rare case, the host receives QAIC_TRANS_DMA_XFER_CONT from the device where resources->xferred_dma_size is equal to the requested transaction size, the function will return 0 before allocating an sgt or setting the fields of the dma_xfer struct. In that case, encode_addr_size_pairs() will try to access the sgt which will lead to a general protection fault. Return an EINVAL in case the user provides a zero-sized ALP, or the device requests continuation after all of the bytes have been transferred.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2025-40172 since 04/16/2025. 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 02/15/2026).

The vulnerability scanner Nessus provides a plugin with the ID 298897 (Ubuntu 25.10 : Linux kernel vulnerabilities (USN-8029-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.114, 6.12.55, 6.17.5 or 6.18-rc2 eliminates this vulnerability. Applying the patch 48b1d42286bfef7628b1d6c8c28d4e456c90f725/551f1dfbcb7f3e6ed07f9d6c8c1c64337fcd0ede/1ab9733d14cc9987cc5dcd1f0ad1f416e302e2e6/11f08c30a3e4157305ba692f1d44cca5fc9a8fca 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 (298897) and CERT Bund (WID-SEC-2025-2579). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

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

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

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: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 298897
Nessus Name: Ubuntu 25.10 : Linux kernel vulnerabilities (USN-8029-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.114/6.12.55/6.17.5/6.18-rc2
Patch: 48b1d42286bfef7628b1d6c8c28d4e456c90f725/551f1dfbcb7f3e6ed07f9d6c8c1c64337fcd0ede/1ab9733d14cc9987cc5dcd1f0ad1f416e302e2e6/11f08c30a3e4157305ba692f1d44cca5fc9a8fca

Timelineinfo

04/16/2025 CVE reserved
11/12/2025 +210 days Advisory disclosed
11/12/2025 +0 days VulDB entry created
02/15/2026 +95 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40172 (🔒)
GCVE (CVE): GCVE-0-2025-40172
GCVE (VulDB): GCVE-100-332133
CERT Bund: WID-SEC-2025-2579 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 11/12/2025 13:30
Updated: 02/15/2026 04:55
Changes: 11/12/2025 13:30 (58), 12/21/2025 04:02 (7), 12/30/2025 23:05 (1), 02/08/2026 13:47 (1), 02/15/2026 04:55 (2)
Complete: 🔍
Cache ID: 216::103

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