CVE-2026-43273 ceph: supply snapshot context in ceph_zero_partial_object()

What is CVE-2026-43273?

CVE-2026-43273 is a medium-severity vulnerability in Linux kernel, published on 6 May 2026.

Official 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!!

Which versions are affected by CVE-2026-43273?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43273?

Upgrade to a fixed version.

Is CVE-2026-43273 being exploited?

There is no known exploitation of CVE-2026-43273 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-43273, DEBIAN-CVE-2026-43273, GHSA-fcq7-vvcv-2qg9, ROOT-OS-DEBIAN-11-CVE-2026-43273, ROOT-OS-UBUNTU-2204-CVE-2026-43273, ROOT-OS-UBUNTU-2404-CVE-2026-43273 and 1 more.