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CVE-2022-49366: ksmbd: fix reference count leak in smb_check_perm_dacl()

• 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: 2025-02-26 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix reference count leak in smb_check_perm_dacl() The issue happens in a specific path in smb_check_perm_dacl(). When "id" and "uid" have the same value, the function simply jumps out of the loop without decrementing the reference count of the object "posix_acls", which is increased by get_acl() earlier. This may result in memory leaks. Fix it by decreasing the reference count of "posix_acls" before jumping to label "check_access_bits".

Affected products

• Linux kernel: from 5.15 before 5.15.47; from 5.16 before 5.17.15; from 5.18 before 5.18.4 — fixed in 5.15.47, 5.17.15, 5.18.4

How to fix

Upgrade to a fixed version: Linux kernel 5.15.47, 5.17.15, 5.18.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/248d71b440aef829f5cc5f6545ca113ef5062900
• https://git.kernel.org/stable/c/9758a6653c27867d810de02b4e5697163dda9883
• https://git.kernel.org/stable/c/cf824b95c12a1abacadbc2d069931963221a3414
• https://git.kernel.org/stable/c/d21a580dafc69aa04f46e6099616146a536b0724

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