CVEvulnerability
CVE-2025-39764
5.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2025-09-11
- Last modified
- 2026-10-19
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ctnetlink: remove refcounting in expectation dumpers
Same pattern as previous patch: do not keep the expectation object
alive via refcount, only store a cookie value and then use that
as the skip hint for dump resumption.
AFAICS this has the same issue as the one resolved in the conntrack
dumper, when we do
if (!refcount_inc_not_zero(&exp->use))
to increment the refcount, there is a chance that exp == last, which
causes a double-increment of the refcount and subsequent memory leak.
Affected configurations
• linux linux kernel (>= 2.6.23 < 6.16.2)
• linux linux kernel 6.17
References
- https://git.kernel.org/stable/c/078d33c95bf534d37aa04269d1ae6158e20082d5 git.kernel.org
- https://git.kernel.org/stable/c/1492e3dcb2be3aa46d1963da96aa9593e4e4db5a Patch
- https://git.kernel.org/stable/c/64b7684042246e3238464c66894e30ba30c7e851 git.kernel.org
- https://git.kernel.org/stable/c/9e5021a906532ca16e2aac69c0607711e1c70b1f git.kernel.org
- https://git.kernel.org/stable/c/a4d634ded4d3d400f115d84f654f316f249531c9 Patch
- https://git.kernel.org/stable/c/b05500444b8eb97644efdd180839a04a706be97c git.kernel.org
- https://git.kernel.org/stable/c/bada48ad5b0590e318d0f79636ff62a2ef9f4955 git.kernel.org
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html cert-portal.siemens.com
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html cert-portal.siemens.com
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html cert-portal.siemens.com