CVE-2026-23247

MEDIUM EPSS 2.0%
Published Mar 18, 20263mo ago · Modified Jun 19, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Mar 18, 2026 3mo ago
Last Modified Jun 19, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*>4.11  –  <6.18.17
linuxlinux_kernel*≥6.19  –  <6.19.7
linuxlinux_kernel4.10.14any
linuxlinux_kernel4.11any
linuxlinux_kernel4.11any
linuxlinux_kernel4.11any
linuxlinux_kernel4.11any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/165573e41f2f66ef98940cf65f838b2cb575d9d1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/46e5b0d7cf55821527adea471ffe52a5afbd9caf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5da5662181ef8a251e3ba564903002c2e87de452
  • git.kernel.org https://git.kernel.org/stable/c/eae2f14ab2efccdb7480fae7d42c4b0116ef8805
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/165573e41f2f66ef98940cf65f838b2cb575d9d1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/46e5b0d7cf55821527adea471ffe52a5afbd9caf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eae2f14ab2efccdb7480fae7d42c4b0116ef8805
    Patch