SB20260720184 - Improper Initialization in Linux kernel ethernet cortina driver
Published: July 20, 2026
Security Bulletin ID
SB20260720184
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Initialization (CVE-ID: CVE-2026-64055)
CWE-ID: CWE-665 - Improper Initialization
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper state management in the gmac_rx() NAPI poll function when assembling packets from a ring buffer. A local user can trigger processing of fragmented packets across poll cycles to cause a denial of service.
The issue occurs when the ring buffer is completely emptied before a packet has been fully assembled.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f
- https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41
- https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0
- https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8
- https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5
- https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b
- https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253
- https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7