Medium 5.5Published May 28, 2026

CVE-2026-46158mptcp: pm: ADD_ADDR rtx: always decrease sk refcount

Updated under an hour ago (Oct 27, 2026, 3:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(). It should then be released in all cases at the end. Some (unlikely) checks were returning directly instead of calling sock_put() to decrease the refcount. Jump to a new 'exit' label to call __sock_put() (which will become sock_put() in the next commit) to fix this potential leak. While at it, drop the '!msk' check which cannot happen because it is never reset, and explicitly mark the remaining one as "unlikely".

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Sep 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 00cfd77b9063dcdf3628a7087faba60de85a9cc8 before f5555a6d7c472849fdf2b426e3d0a85103118793; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8 before e9ba34301d2e90f63f97c76ad9eb98e5250fe961; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8 before 81d8142148164176385c279c7c1e1d581867423d; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8 before 9426265e157dd77ec237c795901ed4dea6d69b5c; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8 before b41dd76f3b9735096c21d3e799a2b9fe36498d57; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8 before acd3d3562315c99f3c0db16f0fcc5f0306638982; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8 before 25e37407442b8766ec2cf52fb4e31b5c3d3aeeae; from 00cfd77b9063dcdf3628a7087faba60de85a9cc8 before 9634cb35af17019baec21ca648516ce376fa10e6	CNA record
linux linux_kernel linux:linux_kernel	from 5.10 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 7.1; 7.1	NVD

References

References

https://git.kernel.org/stable/c/f5555a6d7c472849fdf2b426e3d0a85103118793
https://git.kernel.org/stable/c/e9ba34301d2e90f63f97c76ad9eb98e5250fe961
https://git.kernel.org/stable/c/81d8142148164176385c279c7c1e1d581867423d
https://git.kernel.org/stable/c/9426265e157dd77ec237c795901ed4dea6d69b5c	patch
https://git.kernel.org/stable/c/b41dd76f3b9735096c21d3e799a2b9fe36498d57	patch
https://git.kernel.org/stable/c/acd3d3562315c99f3c0db16f0fcc5f0306638982	patch
https://git.kernel.org/stable/c/25e37407442b8766ec2cf52fb4e31b5c3d3aeeae	patch
https://git.kernel.org/stable/c/9634cb35af17019baec21ca648516ce376fa10e6	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.