CVE-2026-23247
Last modified
CVE-2026-23247 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: tcp: secure_seq: add back ports to TS offset This reverts 28ee1b746f49 ("secure_seq: downgrade to per-host timestamp offsets") tcp_tw_recycle went away in 2017. Zhouyan Deng reported off-path TCP source port leakage via SYN cookie side-channel that can be fixed in multiple ways. One of them is to bring back TCP ports in TS offset randomization. As a bonus, we perform a single siphash() computation to provide both an ISN and a TS offset.. EPSS estimates a 0.12% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: tcp: secure_seq: add back ports to TS offset This reverts 28ee1b746f49 ("secure_seq: downgrade to per-host timestamp offsets") tcp_tw_recycle went away in 2017. Zhouyan Deng reported off-path TCP source port leakage via SYN cookie side-channel that can be fixed in multiple ways. One of them is to bring back TCP ports in TS offset randomization. As a bonus, we perform a single siphash() computation to provide both an ISN and a TS offset.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | > 4.11, < 6.18.17 | — |
| Linux | Linux Kernel | >= 6.19, < 6.19.7 | — |
| Linux | Linux Kernel | 4.10.14 | — |
| Linux | Linux Kernel | 4.11 | — |
| Linux | Linux Kernel | 7.0 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-23247?
How severe is CVE-2026-23247?
How do I fix CVE-2026-23247?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-23241In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23242In the Linux kernel, the following vulnerability has been re…7.5
- CVE-2026-23243In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-23244In the Linux kernel, the following vulnerability has been re…7.1
- CVE-2026-23245In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-23246In the Linux kernel, the following vulnerability has been re…8.8
- CVE-2026-23248In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-23249In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-2325Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 1…6.5
- CVE-2026-23250In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23251In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23252In the Linux kernel, the following vulnerability has been re…5.5
Are you affected by CVE-2026-23247?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST