CVE-2024-53142

Technical Description

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

initramfs: avoid filename buffer overrun

The initramfs filename field is defined in

Documentation/driver-api/early-userspace/buffer-format.rst as:

37 cpio_file := ALGN(4) + cpio_header + filename + "\0" + ALGN(4) + data

...

55 ============= ================== =========================

56 Field name Field size Meaning

57 ============= ================== =========================

...

70 c_namesize 8 bytes Length of filename, including final \0

When extracting an initramfs cpio archive, the kernel's do_name() path

handler assumes a zero-terminated path at @collected, passing it

directly to filp_open() / init_mkdir() / init_mknod().

If a specially crafted cpio entry carries a non-zero-terminated filename

and is followed by uninitialized memory, then a file may be created with

trailing characters that represent the uninitialized memory. The ability

to create an initramfs entry would imply

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References