CVE-2025-38097High· 7.8▾ TwilightIn 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 net…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 14.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
0.2% → 0.2%
Last analysed / modified upstream
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.
linux_kernel >= 5.6, < 6.1.141linux_kernel >= 6.2, < 6.6.93linux_kernel >= 6.7, < 6.12.31linux_kernel >= 6.13, < 6.14.9linux_kernel = 6.15debian_linux = 11.0Upgrade past the affected range:
linux_kernel 6.14.9Connected by shared product, vendor, weakness, or advisory.
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