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CVE-2025-37962: ksmbd: fix memory leak in parse_lease_state()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-20 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix memory leak in parse_lease_state() The previous patch that added bounds check for create lease context introduced a memory leak. When the bounds check fails, the function returns NULL without freeing the previously allocated lease_ctx_info structure. This patch fixes the issue by adding kfree(lreq) before returning NULL in both boundary check cases.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 6.1.134 before 6.1.139; from 6.6.87 before 6.6.91; from 6.12.23 before 6.12.29; from 6.13.11 before 6.14; from 6.14.2 before 6.14.7; 6.15-rc1, 6.15-rc2, 6.15-rc3, 6.15-rc4, 6.15-rc5 — fixed in 6.1.139, 6.12.29, 6.14, 6.14.7, 6.6.91

How to fix

Upgrade to a fixed version: Linux kernel 6.1.139, 6.12.29, 6.14, 6.14.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2148d34371b06dac696c0497a98a6bf905a51650
• https://git.kernel.org/stable/c/829e19ef741d9e9932abdc3bee5466195e0852cf
• https://git.kernel.org/stable/c/af9e2d4732a548db8f6f5a90c2c20a789a3d7240
• https://git.kernel.org/stable/c/eb4447bcce915b43b691123118893fca4f372a8f
• https://git.kernel.org/stable/c/facf22c1a394c1e023dab5daf9a494f722771e1c
• https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html

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