CVE-2025-68291: Linux kernel · mptcp: Initialise rcv_mss before calling tcp_send_active_reset() in
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f07f4ea53e22429c84b20832fa098b5ecc0d4e35 : update Linux kernel when convenient.
Data as of 10 Nov 2026, 13:18 UTC
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
Disclosed: evidence found.
CVE published 16 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
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
- git.kernel.org/stable/c/46b8b58f93f1b383c3840fc6e8fab6c3bce9295f (opens in a new tab)
- git.kernel.org/stable/c/eee39f83246a81d970a9ecb7392b7ab74e660094 (opens in a new tab)
- git.kernel.org/stable/c/05f5e26d488cdc7abc2a826cf1071782d5a21203 (opens in a new tab)
- git.kernel.org/stable/c/88163f85d59b4164884df900ee171720fd26686b (opens in a new tab)
- git.kernel.org/stable/c/f07f4ea53e22429c84b20832fa098b5ecc0d4e35 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)