In the Linux kernel, the following vulnerability has been resolved: nfc: nci: complete pending data exchange on device close In nci_close_device(),… (CVE-2026-23330)
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: complete pending data exchange on device close In nci_close_device(), complete any pending data exchange before closing. The data exchange callback (e.g. rawsock_data_exchange_complete) holds a socket reference. NIPA occasionally hits this leak: unreferenced object 0xff1100000f435000 (size 2048): comm "nci_dev", pid 3954, jiffies 4295441245 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 27 00 01 40 00 00 00 00 00 00 00 00 00 00 00 00 '..@............ backtrace (crc ec2b3c5): __kmalloc_noprof+0x4db/0x730 sk_prot_alloc.isra.0+0xe4/0x1d0 sk_alloc+0x36/0x760 rawsock_create+0xd1/0x540 nfc_sock_create+0x11f/0x280 __sock_create+0x22d/0x630 __sys_socket+0x115/0x1d0 __x64_sys_socket+0x72/0xd0 do_syscall_64+0x117/0xfc0 entry_SYSCALL_64_after_hwframe+0x4b/0x53
AI Analysis
Technical Summary
The vulnerability (CVE-2026-23330) involves the Linux kernel NFC subsystem where the function nci_close_device() did not complete any pending data exchanges before closing the device. This caused a resource leak related to socket references held by the data exchange callback, potentially leading to denial of service (availability impact). The issue has been fixed in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. The fix is included in Ubuntu security notices USN-8567-1 and USN-8574-1, which address multiple kernel vulnerabilities. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity) with attack vector local, low attack complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Potential Impact
The vulnerability impacts system availability by causing resource leaks when closing NFC devices, potentially leading to denial of service conditions. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and included in Linux kernel updates starting from version 6.8.0-1061.64~22.04.1 and later. Users should apply the latest kernel updates provided by their Linux distribution and reboot the system to ensure the fix is active. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions for updating and rebooting. No additional mitigation actions are specified by the vendor.
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: complete pending data exchange on device close In nci_close_device(),… (CVE-2026-23330)
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: complete pending data exchange on device close In nci_close_device(), complete any pending data exchange before closing. The data exchange callback (e.g. rawsock_data_exchange_complete) holds a socket reference. NIPA occasionally hits this leak: unreferenced object 0xff1100000f435000 (size 2048): comm "nci_dev", pid 3954, jiffies 4295441245 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 27 00 01 40 00 00 00 00 00 00 00 00 00 00 00 00 '..@............ backtrace (crc ec2b3c5): __kmalloc_noprof+0x4db/0x730 sk_prot_alloc.isra.0+0xe4/0x1d0 sk_alloc+0x36/0x760 rawsock_create+0xd1/0x540 nfc_sock_create+0x11f/0x280 __sock_create+0x22d/0x630 __sys_socket+0x115/0x1d0 __x64_sys_socket+0x72/0xd0 do_syscall_64+0x117/0xfc0 entry_SYSCALL_64_after_hwframe+0x4b/0x53
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2026-23330) involves the Linux kernel NFC subsystem where the function nci_close_device() did not complete any pending data exchanges before closing the device. This caused a resource leak related to socket references held by the data exchange callback, potentially leading to denial of service (availability impact). The issue has been fixed in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. The fix is included in Ubuntu security notices USN-8567-1 and USN-8574-1, which address multiple kernel vulnerabilities. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity) with attack vector local, low attack complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Potential Impact
The vulnerability impacts system availability by causing resource leaks when closing NFC devices, potentially leading to denial of service conditions. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and included in Linux kernel updates starting from version 6.8.0-1061.64~22.04.1 and later. Users should apply the latest kernel updates provided by their Linux distribution and reboot the system to ensure the fix is active. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions for updating and rebooting. No additional mitigation actions are specified by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23330
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b62bf2d1edb114c89f378
Added to database: 07/18/2026, 11:25:51 UTC
Last enriched: 08/01/2026, 06:38:51 UTC
Last updated: 09/14/2026, 22:01:32 UTC
Views: 18
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