CVE-2023-53276

Summary

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

ubifs: Free memory for tmpfile name

When opening a ubifs tmpfile on an encrypted directory, function fscrypt_setup_filename allocates memory for the name that is to be stored in the directory entry, but after the name has been copied to the directory entry inode, the memory 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 'tmpfile' just opening a tmpfile:

unreferenced object 0xffff88810178f380 (size 32): comm "tmpfile", pid 509, jiffies 4294934744 (age 1524.742s) backtrace: __kmem_cache_alloc_node __kmalloc fscrypt_setup_filename ubifs_tmpfile vfs_tmpfile path_openat

Free this memory after it has been copied to the inode.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < 8ad8c67a897e68426e85990ebfe0a7d1f71fc79faffected
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < 107d481642c356a5668058066360fc473911e628affected
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < 823f554747f8aafaa965fb2f3ae794110ed429efaffected
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < b8f444a4fadfb5070ed7e298e0a5ceb4a18014f3affected
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < ce840284929b75dbbf062e0ce7fcb78a63b08b5eaffected
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < 29738e1bcc799dd754711d4e4aab967f0c018175affected
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < fd197308c0e4f738c7ea687d5332035c5753881caffected
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < 1e43d4284bdc3bd34bd770fea13910ac37ab0618affected
LinuxLinuxf4f61d2cc6d8789a52245a4733b3e5643be154f3 < 1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3affected
LinuxLinux4.10affected
LinuxLinux0 < 4.10unaffected
LinuxLinux4.14.315 <= 4.14.*unaffected
LinuxLinux4.19.283 <= 4.19.*unaffected
LinuxLinux5.4.243 <= 5.4.*unaffected
LinuxLinux5.10.180 <= 5.10.*unaffected
LinuxLinux5.15.111 <= 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