SB20260919140 - Integer overflow in Linux kernel sched
Published: September 19, 2026
Security Bulletin ID
SB20260919140
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) Integer overflow (CVE-ID: CVE-2026-90072)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 an integer overflow in sfq_init() of the SFQ queueing discipline when initializing SFQ on a device with an MTU that wraps psched_mtu() into the sign bit. A local user can configure a device with a crafted MTU value to cause a denial of service.
Exploitation requires CAP_NET_ADMIN in a user namespace.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/2017c355a5a1af77736cd1739fe922f69b5652dc
- https://git.kernel.org/stable/c/6581a82bf08ba5d4e2a6d4e3080df43315b296c4
- https://git.kernel.org/stable/c/816e90057ab1879562a5b7cc688e35bb9027ae97
- https://git.kernel.org/stable/c/86799499585af06a9431c9e7782658667bd62650
- https://git.kernel.org/stable/c/9d782c662879c3adaaca30e05c36910ad11b9e54
- https://git.kernel.org/stable/c/aeb8196ecb95146e3410f635628e6cd47352b3e5
- https://git.kernel.org/stable/c/d72dbdfaeb5b9b8d884e0e036c3442754379ef74
- https://git.kernel.org/stable/c/da16c31517cd2c06bb2c78c73e91ae192c01c426