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CVE-2026-68368

Updated on 10 Aug 2026

Severity

6.8 Medium severity

Details

CVSS score
6.8
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()

When unpacking host-supplied NTBs, ncm_unwrap_ntb() checks datagram length against frame_max but does not verify that the datagram fits within the declared block length. Additionally, when decoding multiple NTBs from a single socket buffer, subsequent block lengths are not checked against the actual remaining buffer data.

With these checks missing, a malicious USB host can specify datagram offsets and lengths that point beyond the block, or supply secondary NTB headers declaring lengths larger than the buffer. skb_put_data() then copies adjacent kernel memory from skb_shared_info into the network skb.

Fix this by verifying that sufficient buffer space remains for the NTB header before parsing, handling zero-length block declarations, ensuring that block lengths never exceed the remaining buffer space, and verifying that each datagram payload stays strictly within the block boundary.

Details

Affected product:
AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , Debian 10 ELS , Debian 11 ELS , TuxCare 9.6 ESU , TuxCare 9.8 ESU , Ubuntu 20.04 ELS
Affected packages:
linux @ 4.19.0 (+6 more)

Fixes

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
Debian 12 Released
43 kernels
  • 6.1.38-1
  • 6.1.38-2
  • 6.1.38-4
  • 6.1.52-1
  • 6.1.55-1
  • 6.1.64-1
  • 6.1.66-1
  • 6.1.69-1
  • 6.1.76-1
  • 6.1.27-1
  • 6.1.67-1
  • 6.1.85-1
  • 6.1.90-1
  • 6.1.94-1
  • 6.1.99-1
  • 6.1.106-3
  • 6.1.112-1
  • 6.1.115-1
  • 6.1.119-1
  • 6.1.123-1
  • 6.1.128-1
  • 6.1.124-1
  • 6.1.129-1
  • 6.1.133-1
  • 6.1.135-1
  • 6.1.137-1
  • 6.1.140-1
  • 6.1.139-1
  • 6.1.147-1
  • 6.1.148-1
  • 6.1.153-1
  • 6.1.158-1
  • 6.1.159-1
  • 6.1.162-1
  • 6.1.164-1
  • 6.1.170-1
  • 6.1.170-3
  • 6.1.172-1
  • 6.1.174-1
  • 6.1.170-2
  • 6.1.176-1
  • 6.1.177-1
  • 6.1.180-1
Debian 13 Released
14 kernels
  • 6.12.85-1
  • 6.12.86-1
  • 6.12.88-1
  • 6.12.74-2
  • 6.12.73-1
  • 6.12.63-1
  • 6.12.69-1
  • 6.12.74-1
  • 6.12.90-1
  • 6.12.90-2
  • 6.12.94-1
  • 6.12.95-1
  • 6.12.96-1
  • 6.12.100-1
Oracle Linux 8 UEK 7 Planned —
Oracle Linux 9 UEK 7 Will Not Fix
112 kernels
  • 5.15.0-101.103.2.1.el9uek
  • 5.15.0-8.91.4.1.el9uek
  • 5.15.0-7.86.6.1.el9uek
  • 5.15.0-5.76.5.1.el9uek
  • 5.15.0-6.80.3.1.el9uek
  • 5.15.0-3.60.5.1.el9uek
  • 5.15.0-0.30.20.el9uek
  • 5.15.0-100.96.32.el9uek
  • 5.15.0-1.43.4.2.el9uek
  • 5.15.0-2.52.3.el9uek
  • 5.15.0-4.70.5.2.el9uek
  • 5.15.0-1.43.4.1.el9uek
  • 5.15.0-0.30.20.1.el9uek
  • 5.15.0-102.110.5.el9uek
  • 5.15.0-102.110.5.1.el9uek
  • 5.15.0-103.114.4.el9uek
  • 5.15.0-104.119.4.2.el9uek
  • 5.15.0-0.30.19.el9uek
  • 5.15.0-105.125.6.2.el9uek
  • 5.15.0-105.125.6.2.1.el9uek
  • 5.15.0-105.125.6.2.2.el9uek
  • 5.15.0-106.131.4.el9uek
  • 5.15.0-200.131.27.el9uek
  • 5.15.0-200.131.27.1.el9uek
  • 5.15.0-201.135.6.el9uek
  • 5.15.0-202.135.2.el9uek
  • 5.15.0-203.146.5.1.el9uek
  • 5.15.0-204.147.6.2.el9uek
  • 5.15.0-204.147.6.3.el9uek
  • 5.15.0-205.149.5.1.el9uek
  • 5.15.0-205.149.5.4.el9uek
  • 5.15.0-206.153.7.el9uek
  • 5.15.0-206.153.7.1.el9uek
  • 5.15.0-207.156.6.el9uek
  • 5.15.0-208.159.3.el9uek
  • 5.15.0-208.159.3.2.el9uek
  • 5.15.0-209.161.7.el9uek
  • 5.15.0-209.161.7.1.el9uek
  • 5.15.0-209.161.7.2.el9uek
  • 5.15.0-210.163.7.el9uek
  • 5.15.0-300.163.18.el9uek
  • 5.15.0-300.163.18.1.el9uek
  • 5.15.0-300.163.18.1.1.el9uek
  • 5.15.0-301.163.5.2.el9uek
  • 5.15.0-302.167.6.el9uek
  • 5.15.0-300.163.18.7.el9uek
  • 5.15.0-302.167.6.1.el9uek
  • 5.15.0-303.171.5.2.el9uek
  • 5.15.0-303.171.5.2.1.el9uek
  • 5.15.0-304.171.4.el9uek
  • 5.15.0-304.171.4.1.el9uek
  • 5.15.0-304.171.4.3.el9uek
  • 5.15.0-303.171.5.2.2.el9uek
  • 5.15.0-305.176.4.el9uek
  • 5.15.0-306.177.4.el9uek
  • 5.15.0-306.177.4.1.el9uek
  • 5.15.0-307.178.5.el9uek
  • 5.15.0-308.179.6.el9uek
  • 5.15.0-308.179.6.2.el9uek
  • 5.15.0-308.179.6.3.el9uek
  • 5.15.0-309.180.4.el9uek
  • 5.15.0-308.179.6.7.el9uek
  • 5.15.0-309.180.4.2.el9uek
  • 5.15.0-308.179.6.11.el9uek
  • 5.15.0-310.184.5.2.el9uek
  • 5.15.0-310.184.5.3.el9uek
  • 5.15.0-311.185.9.el9uek
  • 5.15.0-308.179.6.14.el9uek
  • 5.15.0-312.187.5.el9uek
  • 5.15.0-312.187.5.1.el9uek
  • 5.15.0-312.187.5.2.el9uek
  • 5.15.0-312.187.5.3.el9uek
  • 5.15.0-308.179.6.16.el9uek
  • 5.15.0-313.189.5.1.el9uek
  • 5.15.0-313.189.5.2.el9uek
  • 5.15.0-313.189.5.3.el9uek
  • 5.15.0-314.193.5.3.el9uek
  • 5.15.0-314.193.5.4.el9uek
  • 5.15.0-314.193.5.5.el9uek
  • 5.15.0-315.196.5.1.el9uek
  • 5.15.0-315.196.5.2.el9uek
  • 5.15.0-316.196.4.1.el9uek
  • 5.15.0-316.196.4.2.el9uek
  • 5.15.0-317.197.5.1.el9uek
  • 5.15.0-317.197.5.2.el9uek
  • 5.15.0-318.199.3.2.el9uek
  • 5.15.0-318.199.3.2.1.el9uek
  • 5.15.0-319.201.4.2.el9uek
  • 5.15.0-319.201.4.3.el9uek
  • 5.15.0-319.201.4.4.el9uek
  • 5.15.0-319.201.4.6.el9uek
  • 5.15.0-320.202.8.2.el9uek
  • 5.15.0-320.202.8.3.el9uek
  • 5.15.0-320.202.8.4.el9uek
  • 5.15.0-320.202.8.5.el9uek
  • 5.15.0-318.199.3.6.el9uek
  • 5.15.0-321.202.5.el9uek
  • 5.15.0-321.202.5.1.el9uek
  • 5.15.0-321.202.5.2.el9uek
  • 5.15.0-321.202.5.3.el9uek
  • 5.15.0-322.203.3.2.el9uek
  • 5.15.0-322.203.3.3.el9uek
  • 5.15.0-322.203.3.4.el9uek
  • 5.15.0-322.203.3.4.5.el9uek
  • 5.15.0-308.179.6.18.el9uek
  • 5.15.0-318.199.3.7.el9uek
  • 5.15.0-322.203.3.5.el9uek
  • 5.15.0-322.203.3.4.1.el9uek
  • 5.15.0-323.211.3.3.el9uek
  • 5.15.0-323.211.3.4.el9uek
  • 5.15.0-308.179.6.19.el9uek
  • 5.15.0-323.211.3.5.el9uek
Ubuntu 22.04 Planned —
Ubuntu 22.04 AWS Planned —
Ubuntu 22.04 Azure Planned —
Ubuntu 24.04 Planned —
Ubuntu 24.04 AWS Planned —
Ubuntu 26.04 In Rollout
2 kernels
  • 7.0.0-31.31
  • 7.0.0-34.34