CVE-2023-53396

Summary

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

ubifs: Fix memory leak in do_rename

If renaming a file in an encrypted directory, function fscrypt_setup_filename allocates memory for a file name. This name is never used, and before returning to the caller the memory for it is not freed.

When running kmemleak on it we see that it is registered as a leak. The report below is triggered by a simple program 'rename' that renames a file in an encrypted directory:

unreferenced object 0xffff888101502840 (size 32): comm "rename", pid 9404, jiffies 4302582475 (age 435.735s) backtrace: __kmem_cache_alloc_node __kmalloc fscrypt_setup_filename do_rename ubifs_rename vfs_rename do_renameat2

To fix this we can remove the call to fscrypt_setup_filename as it's not needed.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc67bc98d1f0853bb196e9c48eab38b6f2ddab795 < 43b2f7d690697182beed6f71aa57b7249d3cfc9caffected
LinuxLinux278d9a243635f26c05ad95dcf9c5a593b9e04dc6 < 9f565752b328fe53c9e42b7d4e4d89a1da63d738affected
LinuxLinux278d9a243635f26c05ad95dcf9c5a593b9e04dc6 < 7e264f67b7d6580eff5c2696961039fd05c69258affected
LinuxLinux278d9a243635f26c05ad95dcf9c5a593b9e04dc6 < 517ddc0259d7a7231486bdafde8035c478bc4088affected
LinuxLinux278d9a243635f26c05ad95dcf9c5a593b9e04dc6 < 3a36d20e012903f45714df2731261fdefac900cbaffected
LinuxLinux17495eb2f7f08113b50aba298c2c1a045824c4f7affected
LinuxLinux868de33a39e0e1e91ed3ce4a23a65f30144d2443affected
LinuxLinux5.15.33 < 5.15.112affected
LinuxLinux5.16.19 < 5.17affected
LinuxLinux5.17.2 < 5.18affected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux5.15.112 <= 5.15.*unaffected
LinuxLinux6.1.28 <= 6.1.*unaffected
LinuxLinux6.2.15 <= 6.2.*unaffected
LinuxLinux6.3.2 <= 6.3.*unaffected
LinuxLinux6.4 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References