medium 5.5

CVE-2024-38543 json

lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure

published 2024-06-19 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-37406

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

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

The kcalloc() in dmirror_device_evict_chunk() will return null if the physical memory has run out. As a result, if src_pfns or dst_pfns is dereferenced, the null pointer dereference bug will happen.

Moreover, the device is going away. If the kcalloc() fails, the pages mapping a chunk could not be evicted. So add a __GFP_NOFAIL flag in kcalloc().

Finally, as there is no need to have physically contiguous memory, Switch kcalloc() to kvcalloc() in order to avoid failing allocations.

Patch / fix

fixed in 1 distros 6 links 5

Linux Linux 6.1.93, 6.6.33, 6.8.12, 6.9.3, 6.10

debian ubuntu red hat suse almalinux rocky linux

linux Debian 12 6.1.94-1
linux Debian 14, Debian 13 6.8.12-1

debian advisories DEBIAN-CVE-2024-38543

linux Ubuntu 24.04 LTS 6.8.0-40.40
linux-aws Ubuntu 24.04 LTS 6.8.0-1013.14
linux-gcp Ubuntu 24.04 LTS 6.8.0-1012.13
linux-gke Ubuntu 24.04 LTS 6.8.0-1008.11
linux-ibm Ubuntu 24.04 LTS 6.8.0-1010.10
linux-azure Ubuntu 24.04 LTS 6.8.0-1012.14
linux-raspi Ubuntu 24.04 LTS 6.8.0-1009.10
linux-riscv Ubuntu 24.04 LTS 6.8.0-40.40.1

ubuntu advisories UBUNTU-CVE-2024-38543

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 5.14.0-427.26.1.el9_4
rv RHEL 9 5.14.0-427.26.1.el9_4
perf RHEL 9 5.14.0-427.26.1.el9_4
rtla RHEL 9 5.14.0-427.26.1.el9_4
bpftool RHEL 9 7.3.0-427.26.1.el9_4
libperf RHEL 9 5.14.0-427.26.1.el9_4
kernel-rt RHEL 9 5.14.0-427.26.1.el9_4
kernel-64k RHEL 9 5.14.0-427.26.1.el9_4

red hat advisories RHSA-2024:4583

kernel-rt Linux Micro 6.0 6.4.0-9.1
kernel-source-rt Linux Micro 6.0 6.4.0-9.1
kernel-source Linux Micro 6.0 6.4.0-18.1
kernel-default Linux Micro 6.0 6.4.0-18.1
kernel-kvmsmall Linux Micro 6.0 6.4.0-18.1
kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
kernel-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1
kernel-syms-rt Real Time Module 15 SP6, openSUSE Leap 15.6 6.4.0-150600.10.5.1

suse advisories SUSE-SU-2025:20028-1 SUSE-SU-2025:20008-1 SUSE-SU-2024:2973-1 SUSE-SU-2024:2896-1 SUSE-SU-2024:2571-1

kernel AlmaLinux 9 5.14.0-427.26.1.el9_4
rv AlmaLinux 9 5.14.0-427.26.1.el9_4
perf AlmaLinux 9 5.14.0-427.26.1.el9_4
rtla AlmaLinux 9 5.14.0-427.26.1.el9_4
bpftool AlmaLinux 9 7.3.0-427.26.1.el9_4
libperf AlmaLinux 9 5.14.0-427.26.1.el9_4
kernel-rt AlmaLinux 9 5.14.0-427.26.1.el9_4
kernel-64k AlmaLinux 9 5.14.0-427.26.1.el9_4

almalinux advisories ALSA-2024:4583

kernel Rocky Linux 9 5.14.0-427.26.1.el9_4

rocky linux advisories RLSA-2024:4583

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-2024-38543 updated 2026-11-05 cvss 5.5

kernel: lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure

Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
affected: no fix planned “Will not fix”
Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.26.1.el9_4, perf 5.14.0-427.26.1.el9_4, rtla 5.14.0-427.26.1.el9_4, kernel-devel-matched 5.14.0-427.26.1.el9_4, kernel-64k-devel-matched 5.14.0-427.26.1.el9_4, kernel-debug-devel-matched 5.14.0-427.26.1.el9_4, +6 more Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.26.1.el9_4, kernel 5.14.0-427.26.1.el9_4, kernel-64k 5.14.0-427.26.1.el9_4, kernel-core 5.14.0-427.26.1.el9_4, kernel-tools 5.14.0-427.26.1.el9_4, python3-perf 5.14.0-427.26.1.el9_4, +28 more Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.26.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.26.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.26.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.26.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.26.1.el9_4 Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.26.1.el9_4, kernel-rt-kvm 5.14.0-427.26.1.el9_4, kernel-rt-core 5.14.0-427.26.1.el9_4, kernel-rt-modules 5.14.0-427.26.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.26.1.el9_4, kernel-rt-debug-core 5.14.0-427.26.1.el9_4, +6 more Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.26.1.el9_4, kernel-rt-core 5.14.0-427.26.1.el9_4, kernel-rt-modules 5.14.0-427.26.1.el9_4, kernel-rt-debug-core 5.14.0-427.26.1.el9_4, kernel-rt-modules-core 5.14.0-427.26.1.el9_4, kernel-rt-debug-modules 5.14.0-427.26.1.el9_4, +4 more
fixed: vendor fix RHSA-2024:4583
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 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
not 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 (2024-09-10)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% 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:N/I:N/A:H

Affected products

Linux Linux

Classification

Weakness

CWE-476 NULL Pointer Dereference

Technology feeds

Linux kernel rss critical rss

References

Sources

CVE List CVE-2024-38543
NVD CVE-2024-38543

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.

Summary