CVE-2023-52735: bpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-21 · updated 2026-06-17
Weakness: CWE-120

Description

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself sock_map proto callbacks should never call themselves by design. Protect against bugs like [1] and break out of the recursive loop to avoid a stack overflow in favor of a resource leak. [1] https://lore.kernel.org/all/00000000000073b14905ef2e7401@google.com/

Affected products

Linux kernel: before 5.15.95; from 5.16 before 6.1.13; 6.2-rc1, 6.2-rc2, 6.2-rc3, 6.2-rc4, 6.2-rc5, 6.2-rc6 — fixed in 5.15.95, 6.1.13

How to fix

Upgrade to a fixed version: Linux kernel 5.15.95, 6.1.13. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2023-52735 or the next vulnerability affects your stack