CVE-2024-44947 json
fuse: Initialize beyond-EOF page contents before setting uptodate
published 2024-09-02 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-41247
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
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).
Patch / fix
- Linux Linux 4.19.321, 5.4.283, 5.10.225, 5.15.166, 6.1.107, 6.6.48, 6.10.7, 6.11
- linux Debian 12 6.1.112-1
- linux Debian 14, Debian 13 6.10.7-1
debian advisories DEBIAN-CVE-2024-44947
- linux Ubuntu 20.04 LTS 5.4.0-200.220
- linux Ubuntu 22.04 LTS 5.15.0-125.135
- linux Ubuntu 24.04 LTS 6.8.0-50.51
- linux-aws Ubuntu 20.04 LTS 5.4.0-1135.145
- linux-aws Ubuntu 22.04 LTS 5.15.0-1072.78
- linux-aws Ubuntu 24.04 LTS 6.8.0-1020.22
- linux-gcp Ubuntu 20.04 LTS 5.4.0-1139.148
- linux-gcp Ubuntu 22.04 LTS 5.15.0-1071.79
ubuntu advisories UBUNTU-CVE-2024-44947
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel RHEL 9 5.14.0-503.11.1.el9_5
- rv RHEL 9 5.14.0-503.11.1.el9_5
- perf RHEL 9 5.14.0-503.11.1.el9_5
- rtla RHEL 9 5.14.0-503.11.1.el9_5
- bpftool RHEL 9 7.4.0-503.11.1.el9_5
- libperf RHEL 9 5.14.0-503.11.1.el9_5
- kernel-rt RHEL 9 5.14.0-503.11.1.el9_5
- kernel-64k RHEL 9 5.14.0-503.11.1.el9_5
red hat advisories RHSA-2024:9315
- kernel-rt Linux Micro 6.0 6.4.0-11.1
- kernel-source-rt Linux Micro 6.0 6.4.0-11.1
- kernel-livepatch-MICRO-6-0-RT_Update_3 Linux Micro 6.0 1-1.2
- kernel-source Linux Micro 6.0 6.4.0-20.1
- kernel-default Linux Micro 6.0 6.4.0-20.1
- kernel-kvmsmall Linux Micro 6.0 6.4.0-20.1
- kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
- kernel-livepatch-MICRO-6-0_Update_3 Linux Micro 6.0 1-1.2
suse advisories SUSE-SU-2025:20077-1SUSE-SU-2025:20073-1SUSE-SU-2024:4364-1SUSE-SU-2024:4140-1SUSE-SU-2024:4131-1SUSE-SU-2024:4103-1
- kernel Azure Linux 3.0 6.6.51.1-1
- kernel CBL-Mariner 2.0 5.15.167.1-1
azure linux advisories AZL-49296AZL-49307
Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT
- git.kernel.org/stable/c/49934861514d36d0995be8e81bb3312a499d8d9a commit
- git.kernel.org/stable/c/33168db352c7b56ae18aa55c2cae1a1c5905d30e commit
- git.kernel.org/stable/c/4690e2171f651e2b415e3941ce17f2f7b813aff6 commit
- git.kernel.org/stable/c/8c78303eafbf85a728dd84d1750e89240c677dd9 commit
- git.kernel.org/stable/c/831433527773e665bdb635ab5783d0b95d1246f4 commit
- git.kernel.org/stable/c/ac42e0f0eb66af966015ee33fd355bc6f5d80cd6 commit
- git.kernel.org/stable/c/18a067240817bee8a9360539af5d79a4bf5398a5 commit
- git.kernel.org/stable/c/3c0da3d163eb32f1f91891efaade027fa9b245b9 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2024-44947 updated cvss 5.5
kernel: fuse: Initialize beyond-EOF page contents before setting uptodate
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 moreaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 moreaffected: no fix available “Fix deferred”
-
Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-503.11.1.el9_5, kernel-debuginfo-common-s390x 5.14.0-503.11.1.el9_5, kernel-debuginfo-common-x86_64 5.14.0-503.11.1.el9_5, kernel-debuginfo-common-aarch64 5.14.0-503.11.1.el9_5, kernel-debuginfo-common-ppc64le 5.14.0-503.11.1.el9_5 Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-503.11.1.el9_5, perf 5.14.0-503.11.1.el9_5, rtla 5.14.0-503.11.1.el9_5, kernel-devel-matched 5.14.0-503.11.1.el9_5, kernel-64k-devel-matched 5.14.0-503.11.1.el9_5, kernel-debug-devel-matched 5.14.0-503.11.1.el9_5, +6 more Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.4.0-503.11.1.el9_5, kernel 5.14.0-503.11.1.el9_5, kernel-64k 5.14.0-503.11.1.el9_5, kernel-core 5.14.0-503.11.1.el9_5, kernel-tools 5.14.0-503.11.1.el9_5, python3-perf 5.14.0-503.11.1.el9_5, +29 more Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-503.11.1.el9_5, kernel-rt-core 5.14.0-503.11.1.el9_5, kernel-rt-modules 5.14.0-503.11.1.el9_5, kernel-rt-debug-core 5.14.0-503.11.1.el9_5, kernel-rt-modules-core 5.14.0-503.11.1.el9_5, kernel-rt-debug-modules 5.14.0-503.11.1.el9_5, +4 more Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-503.11.1.el9_5, kernel-rt-kvm 5.14.0-503.11.1.el9_5, kernel-rt-core 5.14.0-503.11.1.el9_5, kernel-rt-modules 5.14.0-503.11.1.el9_5, kernel-rt-debug-kvm 5.14.0-503.11.1.el9_5, kernel-rt-debug-core 5.14.0-503.11.1.el9_5, +6 morefixed: vendor fix RHSA-2024:9315
-
Red Hat CodeReady Linux Builder (v. 9) kernel-cross-headers 5.14.0-503.11.1.el9_5 Red Hat Enterprise Linux AppStream (v. 9) kernel-headers 5.14.0-503.11.1.el9_5not affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.89% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected products
- Linux Linux
Classification
- Weakness
-
- CWE-665 Improper Initialization
- Technology feeds
References
-
git.kernel.org
/stable/c/49934861514d36d0995be8e81bb3312a499d8d9a
patch
-
git.kernel.org
/stable/c/33168db352c7b56ae18aa55c2cae1a1c5905d30e
patch
-
git.kernel.org
/stable/c/4690e2171f651e2b415e3941ce17f2f7b813aff6
patch
-
git.kernel.org
/stable/c/8c78303eafbf85a728dd84d1750e89240c677dd9
patch
-
git.kernel.org
/stable/c/831433527773e665bdb635ab5783d0b95d1246f4
patch
-
git.kernel.org
/stable/c/ac42e0f0eb66af966015ee33fd355bc6f5d80cd6
patch
-
git.kernel.org
/stable/c/18a067240817bee8a9360539af5d79a4bf5398a5
patch
-
git.kernel.org
/stable/c/3c0da3d163eb32f1f91891efaade027fa9b245b9
patch
- project-zero.issues.chromium.org /issues/42451729
- lists.debian.org /debian-lts-announce/2025/01/msg00001.html
- lists.debian.org /debian-lts-announce/2024/10/msg00003.html
Sources
- CVE List CVE-2024-44947
- NVD CVE-2024-44947
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.