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VulnerabilityPublished Updated

CVE-2025-68291: Linux kernel · mptcp: Initialise rcv_mss before calling tcp_send_active_reset() in

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f07f4ea53e22429c84b20832fa098b5ecc0d4e35 : update Linux kernel when convenient.

Data as of 10 Nov 2026, 13:18 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in f07f4ea53e22429c84b20832fa098b5ecc0d4e35, eee39f83246a81d970a9ecb7392b7ab74e660094, 88163f85d59b4164884df900ee171720fd26686b +6

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ ae155060247be8dcae3802a95bd1bdf93ab3215d, < f07f4ea53e22429c84b20832fa098b5ecc0d4e35
Fixed in
  • f07f4ea53e22429c84b20832fa098b5ecc0d4e35
LinuxLinuxAffected
  • ≥ 3a13454fd098ed51e733958488f8ec62859a9ed8, < eee39f83246a81d970a9ecb7392b7ab74e660094
Fixed in
  • eee39f83246a81d970a9ecb7392b7ab74e660094
LinuxLinuxAffected
  • ≥ c4f7b0916b95fd2226e5ab98882482b08f52e1c0, < 88163f85d59b4164884df900ee171720fd26686b
Fixed in
  • 88163f85d59b4164884df900ee171720fd26686b
LinuxLinuxAffected
  • ≥ 9ea05fabce31ff93a0adae8221c58bc6d7b832f3, < 46b8b58f93f1b383c3840fc6e8fab6c3bce9295f
Fixed in
  • 46b8b58f93f1b383c3840fc6e8fab6c3bce9295f
LinuxLinuxAffected
  • ≥ f6fb2cbc91a81178dea23d463503b4525a76825d, < 05f5e26d488cdc7abc2a826cf1071782d5a21203
Fixed in
  • 05f5e26d488cdc7abc2a826cf1071782d5a21203
LinuxLinuxAffected
  • >=6.17.10 <6.17.11
Fixed in
  • 6.17.11

AI-suggested

This vulnerability has been fixed in Linux kernel versions 6.1.160, 6.6.120, 6.12.61, and 6.17.11. Users and administrators should upgrade affected Linux kernel versions to these or later releases to remediate the issue. No additional mitigation steps are indicated or required.

Description

A vulnerability in the Linux kernel's Multipath TCP (MPTCP) implementation was fixed by initializing the rcv_mss variable before calling tcp_send_active_reset() in the mptcp_do_fastclose() function. This issue was reported by syzbot as a divide-by-zero error in __tcp_select_window() caused by an MPTCP socket. The flaw could lead to a kernel crash (divide error). The fix aligns with a previous correction made for the bare TCP implementation. The vulnerability affects specific Linux kernel versions and has been addressed in subsequent releases.

References

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