In the Linux kernel, the following vulnerability has been resolved: usbip: validate number_of_packets in usbip_pack_ret_submit() When a USB/IP… (CVE-2026-31607)
A heap out-of-bounds write vulnerability was discovered and resolved in the Linux kernel's USB/IP subsystem. The issue occurs when a USB/IP client receives a RET_SUBMIT response with a manipulated number_of_packets value larger than originally submitted, causing out-of-bounds writes in urb->iso_frame_desc[]. This flaw was confirmed by KASAN testing on kernel version 7.0.0-rc5. The vulnerability has a high CVSS score of 9.8 and affects multiple Linux kernel versions prior to specific patched releases. A patch is available and included in updated Linux kernel packages. Users are advised to update and reboot their systems to apply the fix.
AI Analysis
Technical Summary
The Linux kernel's USB/IP client code in usbip_pack_ret_submit() previously did not validate the number_of_packets field in RET_SUBMIT responses. This allowed a malicious USB/IP server to specify a number_of_packets value larger than the originally allocated size for urb->iso_frame_desc[], leading to a heap out-of-bounds write in usbip_recv_iso(). This vulnerability was confirmed by KASAN on kernel 7.0.0-rc5. The issue affects multiple Linux kernel versions prior to the patched releases. The vulnerability has been assigned CVE-2026-31607 with a CVSS 3.1 score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Vendor advisories from Ubuntu confirm that patches have been released in updated kernel versions and recommend system updates and reboots to apply the fix.
Potential Impact
Successful exploitation allows a remote attacker controlling a malicious USB/IP server to cause a heap out-of-bounds write in the Linux kernel on the client system. This can lead to arbitrary code execution, system compromise, or denial of service. The vulnerability has a high severity rating with full confidentiality, integrity, and availability impact as per the CVSS score.
Mitigation Recommendations
A patch is available and has been released in updated Linux kernel packages. Users should apply the vendor-provided kernel updates and reboot their systems to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow the vendor advisory instructions for updating to the fixed kernel versions.
In the Linux kernel, the following vulnerability has been resolved: usbip: validate number_of_packets in usbip_pack_ret_submit() When a USB/IP… (CVE-2026-31607)
Description
A heap out-of-bounds write vulnerability was discovered and resolved in the Linux kernel's USB/IP subsystem. The issue occurs when a USB/IP client receives a RET_SUBMIT response with a manipulated number_of_packets value larger than originally submitted, causing out-of-bounds writes in urb->iso_frame_desc[]. This flaw was confirmed by KASAN testing on kernel version 7.0.0-rc5. The vulnerability has a high CVSS score of 9.8 and affects multiple Linux kernel versions prior to specific patched releases. A patch is available and included in updated Linux kernel packages. Users are advised to update and reboot their systems to apply the fix.
CVSS v3.1
Score 9.8critical
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's USB/IP client code in usbip_pack_ret_submit() previously did not validate the number_of_packets field in RET_SUBMIT responses. This allowed a malicious USB/IP server to specify a number_of_packets value larger than the originally allocated size for urb->iso_frame_desc[], leading to a heap out-of-bounds write in usbip_recv_iso(). This vulnerability was confirmed by KASAN on kernel 7.0.0-rc5. The issue affects multiple Linux kernel versions prior to the patched releases. The vulnerability has been assigned CVE-2026-31607 with a CVSS 3.1 score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Vendor advisories from Ubuntu confirm that patches have been released in updated kernel versions and recommend system updates and reboots to apply the fix.
Potential Impact
Successful exploitation allows a remote attacker controlling a malicious USB/IP server to cause a heap out-of-bounds write in the Linux kernel on the client system. This can lead to arbitrary code execution, system compromise, or denial of service. The vulnerability has a high severity rating with full confidentiality, integrity, and availability impact as per the CVSS score.
Mitigation Recommendations
A patch is available and has been released in updated Linux kernel packages. Users should apply the vendor-provided kernel updates and reboot their systems to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow the vendor advisory instructions for updating to the fixed kernel versions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31607
- 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","Ubuntu:26.04:LTS"]
- Cvss Version
- 4.0
Threat ID: 6a58b4d368715ace43dab7f9
Added to database: 07/16/2026, 10:39:15 UTC
Last enriched: 08/01/2026, 05:16:06 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 28
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