Improper Initialization Affecting kernel-default-livepatch package, versions <5.3.18-150300.59.174.1


Severity

Recommended
high

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-SLES153-KERNELDEFAULTLIVEPATCH-7986081
  • published17 Sept 2024
  • disclosed16 Sept 2024

Introduced: 16 Sep 2024

CVE-2024-44947  (opens in a new tab)
CWE-665  (opens in a new tab)

How to fix?

Upgrade SLES:15.3 kernel-default-livepatch to version 5.3.18-150300.59.174.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-default-livepatch package and not the kernel-default-livepatch package as distributed by SLES. See How to fix? for SLES:15.3 relevant fixed versions and status.

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

fuse: Initialize beyond-EOF page contents before setting uptodate

fuse_notify_store(), unlike fuse_do_readpage(), does not enable page zeroing (because it can be used to change partial page contents).

So fuse_notify_store() must be more careful to fully initialize page contents (including parts of the page that are beyond end-of-file) before marking the page uptodate.

The current code can leave beyond-EOF page contents uninitialized, which makes these uninitialized page contents visible to userspace via mmap().

This is an information leak, but only affects systems which do not enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the corresponding kernel command line parameter).

CVSS Scores

version 3.1