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CVE-2026-43273

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ceph: supply snapshot context in ceph_zero_partial_object() The ceph_zero_partial_object function was missing proper snapshot c…

Published May 6, 2026EPSS 0.16%

Overview

CVE-2026-43273 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

ceph: supply snapshot context in ceph_zero_partial_object()

The ceph_zero_partial_object function was missing proper snapshot

context for its OSD write operations, which could lead to data

inconsistencies in snapshots.

Reproducer:

../src/vstart.sh --new -x --localhost --bluestore

./bin/ceph auth caps client.fs_a mds 'allow rwps fsname=a' mon 'allow r fsname=a' osd 'allow rw tag cephfs data=a'

mount -t ceph [email protected]=/ /mnt/mycephfs/ -o conf=./ceph.conf

dd if=/dev/urandom of=/mnt/mycephfs/foo bs=64K count=1

mkdir /mnt/mycephfs/.snap/snap1

md5sum /mnt/mycephfs/.snap/snap1/foo

fallocate -p -o 0 -l 4096 /mnt/mycephfs/foo

echo 3 > /proc/sys/vm/drop/caches

md5sum /mnt/mycephfs/.snap/snap1/foo # get different md5sum!!

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

Refgit.kernel.org/stable/c/36673344b41c31fb502dd0d0113cec1aa96f581eRefgit.kernel.org/stable/c/4097e70fc543cca72982854108a32f6ae924e727Refgit.kernel.org/stable/c/531a76c5a2e44264cee8a70121e63eb28c1ba728Refgit.kernel.org/stable/c/5788b742007f53406049bef917833a71ddd43f60Refgit.kernel.org/stable/c/69e59a87bab0ea31ab2a584fc65e12dafacf8953Refgit.kernel.org/stable/c/757873abfc8ea38592582180aed0f57f0f0cb07aRefgit.kernel.org/stable/c/9efa154609cdb658f51c7d76b30a09f7e6485250Refgit.kernel.org/stable/c/f16bd3fa74a2084ee7e16a8a2be7e7399b970907

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43273?

CVE-2026-43273 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43273?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43273?

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

How can CyberStrike help with CVE-2026-43273?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43273 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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