CVE-2022-49366

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux777cad1604d68ed4379ec899d1f7d2f6a29f01f0 < cf824b95c12a1abacadbc2d069931963221a3414affected
LinuxLinux777cad1604d68ed4379ec899d1f7d2f6a29f01f0 < 248d71b440aef829f5cc5f6545ca113ef5062900affected
LinuxLinux777cad1604d68ed4379ec899d1f7d2f6a29f01f0 < 9758a6653c27867d810de02b4e5697163dda9883affected
LinuxLinux777cad1604d68ed4379ec899d1f7d2f6a29f01f0 < d21a580dafc69aa04f46e6099616146a536b0724affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.47 <= 5.15.*unaffected
LinuxLinux5.17.15 <= 5.17.*unaffected
LinuxLinux5.18.4 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References