What’s Vulnerable › Vulnerabilities

CVE-2025-39929: smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-04 · updated 2026-10-19
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path During tests of another unrelated patch I was able to trigger this error: Objects remaining on __kmem_cache_shutdown()

Affected products

• Linux kernel: from 4.16 before 6.1.154; from 6.2 before 6.6.108; from 6.7 before 6.12.49; from 6.13 before 6.16.9; 6.17-rc1, 6.17-rc2, 6.17-rc3, 6.17-rc4, 6.17-rc5, 6.17-rc6 — fixed in 6.1.154, 6.12.49, 6.16.9, 6.6.108

How to fix

Upgrade to a fixed version: Linux kernel 6.1.154, 6.12.49, 6.16.9, 6.6.108. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0991418bf98f191d0c320bd25245fcffa1998c7e
• https://git.kernel.org/stable/c/3d7c075c878ac844e33c43e506c2fa27ac7e9689
• https://git.kernel.org/stable/c/5aa69aabcb275a8012265233c7694076ce1d9102
• https://git.kernel.org/stable/c/922338efaad63cfe30d459dfc59f9d69ff93ded4
• https://git.kernel.org/stable/c/aa4cf7615328eae44f3b4bf5f4fde3fb390c27c6
• https://git.kernel.org/stable/c/daac51c7032036a0ca5f1aa419ad1b0471d1c6e0
• https://git.kernel.org/stable/c/e7b7a93879558e77d950f1ff9a6f3daa385b33df
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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