CVE-2025-38097

MEDIUM EPSS 5.3%
Published Jul 3, 202512mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Jul 3, 2025 12mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: espintcp: remove encap socket caching to avoid reference leak The current scheme for caching the encap socket can lead to reference leaks when we try to delete the netns. The reference chain is: xfrm_state -> enacp_sk -> netns Since the encap socket is a userspace socket, it holds a reference on the netns. If we delete the espintcp state (through flush or individual delete) before removing the netns, the reference on the socket is dropped and the netns is correctly deleted. Otherwise, the netns may not be reachable anymore (if all processes within the ns have terminated), so we cannot delete the xfrm state to drop its reference on the socket. This patch results in a small (~2% in my tests) performance regression. A GC-type mechanism could be added for the socket cache, to clear references if the state hasn't been used "recently", but it's a lot more complex than just not caching the socket.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
5.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥5.6  –  <6.1.141
linuxlinux_kernel*≥6.2  –  <6.6.93
linuxlinux_kernel*≥6.7  –  <6.12.31
linuxlinux_kernel*≥6.13  –  <6.14.9
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
debiandebian_linux11.0any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/028363685bd0b7a19b4a820f82dd905b1dc83999
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/74fd327767fb784c5875cf7c4ba1217f26020943
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9cbca30102028f9ad3d2098f935c4368f581fd07
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b58a295d10065960bcb9d60cb8ca6ead9837cd27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e4cde54b46a87231c77256a633be1bef62687d69
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/028363685bd0b7a19b4a820f82dd905b1dc83999
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/74fd327767fb784c5875cf7c4ba1217f26020943
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9cbca30102028f9ad3d2098f935c4368f581fd07
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b58a295d10065960bcb9d60cb8ca6ead9837cd27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e4cde54b46a87231c77256a633be1bef62687d69
    Patch