SB2026040689 - Out-of-bounds read in Linux kernel net usb driver
Published: April 6, 2026
Security Bulletin ID
SB2026040689
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-23447)
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in cdc_ncm_rx_verify_ndp32() when processing a crafted NDP32 structure in a received NTB. A remote attacker can send a specially crafted network packet to disclose sensitive information.
The issue occurs because the DPE array size is validated against the total skb length without accounting for ndpoffset, allowing reads beyond the intended bounds when the NDP32 is placed near the end of the NTB.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/125f932a76a97904ef8a555f1dd53e5d0e288c54
- https://git.kernel.org/stable/c/77914255155e68a20aa41175edeecf8121dac391
- https://git.kernel.org/stable/c/a5bd5a2710310c965ea4153cba4210988a3454e2
- https://git.kernel.org/stable/c/af0d1613d6751489dbf9f69aac1123f0b1e566e5
- https://git.kernel.org/stable/c/de70da1fb1d152e981ecb3157f7ec2b633005c16