CVE-2024-53111

Technical Description

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

mm/mremap: fix address wraparound in move_page_tables()

On 32-bit platforms, it is possible for the expression `len + old_addr <

old_end` to be false-positive if `len + old_addr` wraps around.

`old_addr` is the cursor in the old range up to which page table entries

have been moved; so if the operation succeeded, `old_addr` is the *end* of

the old region, and adding `len` to it can wrap.

The overflow causes mremap() to mistakenly believe that PTEs have been

copied; the consequence is that mremap() bails out, but doesn't move the

PTEs back before the new VMA is unmapped, causing anonymous pages in the

region to be lost. So basically if userspace tries to mremap() a

private-anon region and hits this bug, mremap() will return an error and

the private-anon region's contents appear to have been zeroed.

The idea of this check is that `old_end - len` is the original start

address, and writing the check that way also make

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