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THREATINT
PUBLISHED

CVE-2025-38097

espintcp: remove encap socket caching to avoid reference leak



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.

Reserved 2025-04-16 | Published 2025-07-03 | Updated 2025-07-03 | Assigner Linux

Product status

Default status
unaffected

e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before e4cde54b46a87231c77256a633be1bef62687d69
affected

e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before b58a295d10065960bcb9d60cb8ca6ead9837cd27
affected

e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 9cbca30102028f9ad3d2098f935c4368f581fd07
affected

e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 74fd327767fb784c5875cf7c4ba1217f26020943
affected

e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 before 028363685bd0b7a19b4a820f82dd905b1dc83999
affected

Default status
affected

5.6
affected

Any version before 5.6
unaffected

6.1.141
unaffected

6.6.93
unaffected

6.12.31
unaffected

6.14.9
unaffected

6.15
unaffected

References

git.kernel.org/...c/e4cde54b46a87231c77256a633be1bef62687d69

git.kernel.org/...c/b58a295d10065960bcb9d60cb8ca6ead9837cd27

git.kernel.org/...c/9cbca30102028f9ad3d2098f935c4368f581fd07

git.kernel.org/...c/74fd327767fb784c5875cf7c4ba1217f26020943

git.kernel.org/...c/028363685bd0b7a19b4a820f82dd905b1dc83999

cve.org (CVE-2025-38097)

nvd.nist.gov (CVE-2025-38097)

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