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Fencer Vulns
medium 5.5

CVE-2024-43854 json

block: initialize integrity buffer to zero before writing it to media

published 2024-08-17 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-40504

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 14%
public exploits
0
none known

Summary

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

block: initialize integrity buffer to zero before writing it to media

Metadata added by bio_integrity_prep is using plain kmalloc, which leads to random kernel memory being written media. For PI metadata this is limited to the app tag that isn't used by kernel generated metadata, but for non-PI metadata the entire buffer leaks kernel memory.

Fix this by adding the __GFP_ZERO flag to allocations for writes.

Patch / fix

  • Linux Linux 4.19.322, 5.4.284, 5.10.226, 5.15.165, 6.1.103, 6.6.44, 6.10.3, 6.11
  • linux Debian 12 6.1.106-1
  • linux Debian 14, Debian 13 6.10.3-1

debian advisories DEBIAN-CVE-2024-43854

  • 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-2024-43854

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 5.14.0-503.16.1.el9_5
  • rv RHEL 9 5.14.0-503.16.1.el9_5
  • perf RHEL 9 5.14.0-503.16.1.el9_5
  • rtla RHEL 9 5.14.0-503.16.1.el9_5
  • bpftool RHEL 9 7.4.0-503.16.1.el9_5
  • libperf RHEL 9 5.14.0-503.16.1.el9_5
  • kernel-rt RHEL 9 5.14.0-503.16.1.el9_5
  • kernel-64k RHEL 9 5.14.0-503.16.1.el9_5

red hat advisories RHSA-2024:10939RHSA-2024:10773RHSA-2024:10772RHSA-2024:8870RHSA-2024:8856RHSA-2024:8617

  • kernel-rt Linux Micro 6.0 6.4.0-10.1
  • kernel-source-rt Linux Micro 6.0 6.4.0-10.1
  • kernel-livepatch-MICRO-6-0-RT_Update_2 Linux Micro 6.0 1-1.1
  • kernel-source Linux Micro 6.0 6.4.0-19.1
  • kernel-default Linux Micro 6.0 6.4.0-19.1
  • kernel-kvmsmall Linux Micro 6.0 6.4.0-19.1
  • kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
  • kernel-livepatch-MICRO-6-0_Update_2 Linux Micro 6.0 1-1.1

suse advisories SUSE-SU-2025:20047-1SUSE-SU-2025:20044-1SUSE-SU-2024:4345-1SUSE-SU-2024:4131-1SUSE-SU-2024:3483-1SUSE-SU-2024:3383-1

  • kernel AlmaLinux 9 5.14.0-503.16.1.el9_5
  • rv AlmaLinux 9 5.14.0-503.16.1.el9_5
  • perf AlmaLinux 9 5.14.0-503.16.1.el9_5
  • rtla AlmaLinux 9 5.14.0-503.16.1.el9_5
  • bpftool AlmaLinux 9 7.4.0-503.16.1.el9_5
  • libperf AlmaLinux 9 5.14.0-503.16.1.el9_5
  • kernel-rt AlmaLinux 9 5.14.0-503.16.1.el9_5
  • kernel-64k AlmaLinux 9 5.14.0-503.16.1.el9_5

almalinux advisories ALSA-2024:10939ALSA-2024:8856ALSA-2024:8870ALSA-2024:8617

  • kernel Rocky Linux 9 5.14.0-427.42.1.el9_4
  • kernel-rt Rocky Linux 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel Rocky Linux 8 4.18.0-553.27.1.el8_10

rocky linux advisories RLSA-2024:8617RLSA-2024:8870RLSA-2024:8856

  • kernel CBL-Mariner 2.0 5.15.167.1-1
  • kernel Azure Linux 3.0 6.6.47.1-1

azure linux advisories AZL-47958AZL-48033

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

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-2024-43854 updated cvss 5.5

kernel: block: initialize integrity buffer to zero before writing it to media

  • 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
    affected: workaround, no fix planned “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.”
  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-503.16.1.el9_5, kernel-debuginfo-common-s390x 5.14.0-503.16.1.el9_5, kernel-debuginfo-common-x86_64 5.14.0-503.16.1.el9_5, kernel-debuginfo-common-aarch64 5.14.0-503.16.1.el9_5, kernel-debuginfo-common-ppc64le 5.14.0-503.16.1.el9_5
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:10939
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.95.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.95.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.95.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.95.1.el9_2
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:10772
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.42.1.el9_4, rv 5.14.0-503.16.1.el9_5, perf 5.14.0-427.42.1.el9_4, perf 5.14.0-503.16.1.el9_5, rtla 5.14.0-427.42.1.el9_4, rtla 5.14.0-503.16.1.el9_5, +18 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8617
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.95.1.el9_2, rtla 5.14.0-284.95.1.el9_2, kernel-devel-matched 5.14.0-284.95.1.el9_2, kernel-64k-devel-matched 5.14.0-284.95.1.el9_2, kernel-debug-devel-matched 5.14.0-284.95.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.95.1.el9_2, +5 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:10772
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.27.1.el8_10, kernel 4.18.0-553.27.1.el8_10, bpftool 4.18.0-553.27.1.el8_10, kernel-core 4.18.0-553.27.1.el8_10, kernel-tools 4.18.0-553.27.1.el8_10, python3-perf 4.18.0-553.27.1.el8_10, +15 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8856
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.42.1.el9_4, bpftool 7.4.0-503.16.1.el9_5, kernel 5.14.0-427.42.1.el9_4, kernel 5.14.0-503.16.1.el9_5, kernel-64k 5.14.0-427.42.1.el9_4, kernel-64k 5.14.0-503.16.1.el9_5, +63 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8617
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.95.1.el9_2, kernel 5.14.0-284.95.1.el9_2, kernel-64k 5.14.0-284.95.1.el9_2, kernel-core 5.14.0-284.95.1.el9_2, kernel-tools 5.14.0-284.95.1.el9_2, python3-perf 5.14.0-284.95.1.el9_2, +28 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:10772
show 11 more
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.27.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.27.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.27.1.el8_10
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8856
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.42.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.42.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.42.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.42.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.42.1.el9_4
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8617
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-kvm 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-core 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-modules 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-debug-kvm 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-debug-core 4.18.0-553.27.1.rt7.368.el8_10, +4 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8870
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.42.1.el9_4, kernel-rt-kvm 5.14.0-427.42.1.el9_4, kernel-rt-core 5.14.0-427.42.1.el9_4, kernel-rt-modules 5.14.0-427.42.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.42.1.el9_4, kernel-rt-debug-core 5.14.0-427.42.1.el9_4, +6 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8617
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-503.16.1.el9_5, kernel-rt-core 5.14.0-503.16.1.el9_5, kernel-rt-modules 5.14.0-503.16.1.el9_5, kernel-rt-debug-core 5.14.0-503.16.1.el9_5, kernel-rt-modules-core 5.14.0-503.16.1.el9_5, kernel-rt-debug-modules 5.14.0-503.16.1.el9_5, +4 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:10939
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-core 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-modules 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-debug-core 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-modules-core 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-debug-modules 5.14.0-284.95.1.rt14.380.el9_2, +4 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:10773
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-503.16.1.el9_5, kernel-rt-kvm 5.14.0-503.16.1.el9_5, kernel-rt-core 5.14.0-503.16.1.el9_5, kernel-rt-modules 5.14.0-503.16.1.el9_5, kernel-rt-debug-kvm 5.14.0-503.16.1.el9_5, kernel-rt-debug-core 5.14.0-503.16.1.el9_5, +6 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:10939
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-kvm 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-core 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-modules 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-debug-kvm 5.14.0-284.95.1.rt14.380.el9_2, kernel-rt-debug-core 5.14.0-284.95.1.rt14.380.el9_2, +6 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:10773
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-core 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-modules 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-debug-core 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-debug-modules 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-modules-extra 4.18.0-553.27.1.rt7.368.el8_10, +2 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8870
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.42.1.el9_4, kernel-rt-core 5.14.0-427.42.1.el9_4, kernel-rt-modules 5.14.0-427.42.1.el9_4, kernel-rt-debug-core 5.14.0-427.42.1.el9_4, kernel-rt-modules-core 5.14.0-427.42.1.el9_4, kernel-rt-debug-modules 5.14.0-427.42.1.el9_4, +4 more
    fixed: vendor fix “Fix this issue by adding the __GFP_ZERO flag to allocations for writes.” RHSA-2024:8617
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.95.1.el9_2
    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

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% 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-401 Missing Release of Memory after Effective Lifetime
Technology feeds

References

Sources

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.