HOMEVULNERABILITIESCVE-2026-23247
NONE

CVE-2026-23247

Published: March 18, 2026· Updated: Mar 18, 2026

EPSS:0.02%probability of exploitation in 30 daysPercentile:5.7th

Official 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.

NVD Source

Technical Analysis

CVE-2026-23247 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

Affected Vendors & Products

Mentioned vendors (from description):
Linux
CPE data not yet available in NVD for this CVE.

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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All References (3)

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

Quick Facts

CVE IDCVE-2026-23247
SeverityNONE
CISA KEVNo
EPSS (30d)0.02%
PublishedMar 18, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-23247 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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