CVE-2026-23247General(linux / linux_kernel)

LOWCVSS 5.5 · MEDIUM

Signal is active with 3 mentions in latest observed window

Immediate actions

  • Patch linux linux_kernel systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

0.5/ 10 priority

Sources & remediation

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • linux_kernel

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • General: 2 classified signals
  • 3 total mentions across 1 day

Affected systems

Vendors
Products
linux_kernel

3 versions affected across 1 product

Deep dive

Activity timeline3 mentions / 1d
01223Mentions · 2026-03-18: 3Patch / Workaround · 2026-03-18: 1Technical Details · 2026-03-18: 103-18
Signal classification2 categories
General
266.7%
Patch
133.3%
Referenced assets4 URLs
Full discourse3 posts
  • Brad Spengler@spendergrsec
    General

    Another from today, posted here two weeks ago: https://lore.kernel.org/linux-cve-announce/2026031818-CVE-2026-23247-07b3@gregkh/T/#u https://x.com/spendergrsec/status/2029543696949981339

    Post summary

    The post merely references an earlier CVE announcement via links, offering no new detail or actionable information.

    10040384
    4.4K followersView on X
  • CVE@CVEnew
    Patch

    CVE-2026-23247 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 t… https://www.cve.org/CVERecord?id=CVE-2026-23247

    Post summary

    The text announces that CVE‑2026‑23247 has been fixed in the Linux kernel via a revert commit, with no exploitation details or PoC provided.

    00000131
    56.7K followersView on X
  • CyberDudeBivash® | Global Cybersecurity Company@cyberbivash
    General

    🚨 CYBERDUDEBIVASH SENTINEL APEX ALERT 🚨 Threat: CVE-2026-23247 - tcp: secure_seq: add back ports to TS offset Intel Report: https://ift.tt/9DP4AoB

    Post summary

    The post alerts to CVE‑2026‑23247 and links to an Intel report, but provides no proof‑of‑concept, exploit, or patch information.

    0000028
    335 followersView on X
CPE platform detail8 entries

8 of 8 entries

PartVendorProductVersionTarget SWTarget HW
OSlinuxlinux_kernel---
OSlinuxlinux_kernel4.10.14--
OSlinuxlinux_kernel4.11--
OSlinuxlinux_kernel4.11--
OSlinuxlinux_kernel4.11--
OSlinuxlinux_kernel4.11--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--

Explore more