CVE-2023-53055

Summary

In the Linux kernel, the following vulnerability has been resolved:

fscrypt: destroy keyring after security_sb_delete()

fscrypt_destroy_keyring() must be called after all potentially-encrypted inodes were evicted; otherwise it cannot safely destroy the keyring. Since inodes that are in-use by the Landlock LSM don't get evicted until security_sb_delete(), this means that fscrypt_destroy_keyring() must be called after security_sb_delete().

This fixes a WARN_ON followed by a NULL dereference, only possible if Landlock was being used on encrypted files.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe6f4fd85ef1ee6ab356bfbd64df28c1cb73aee7e < 992a3f3e8a0c92151dfdf65fc85567c865fd558aaffected
LinuxLinuxd7e7b9af104c7b389a0c21eb26532511bce4b510 < d77531fac6a1fd9f1db0195438ba5419d72b96c4affected
LinuxLinuxd7e7b9af104c7b389a0c21eb26532511bce4b510 < 497ab5d9c7852dfedab2c9de75e41b60e54b7c5daffected
LinuxLinuxd7e7b9af104c7b389a0c21eb26532511bce4b510 < ccb820dc7d2236b1af0d54ae038a27b5b6d5ae5aaffected
LinuxLinux391cceee6d435e616f68631e68f5b32d480b1e67affected
LinuxLinux68d15d6558a386f46d815a6ac39edecad713a1bfaffected
LinuxLinux5.15.78 < 5.15.105affected
LinuxLinux5.10.154 < 5.11affected
LinuxLinux6.0.8 < 6.1affected
LinuxLinux6.1affected
LinuxLinux0 < 6.1unaffected
LinuxLinux5.15.105 <= 5.15.*unaffected
LinuxLinux6.1.22 <= 6.1.*unaffected
LinuxLinux6.2.9 <= 6.2.*unaffected
LinuxLinux6.3 <= *unaffected

Weaknesses

References