PT-2026-43787 · Linux+3 · Linux+156

Published 2026-05-27 · Updated 2026-05-28 · CVE-2026-45920

Positive Technologies (AI Summary)

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the ext4 file system where a double decrement of the dirty clusters counter occurs during file system shutdown. This happens in the error path between the ext4 mb mark diskspace used() function and its caller ext4 mb new blocks(). Specifically, when a shutdown triggers an error return from ext4 handle dirty metadata() calls within ext4 mb mark context(), ext4 mb mark diskspace used() decrements the cluster counters and returns an error. Subsequently, ext4 mb new blocks() decrements the s dirtyclusters counter variable a second time, leading to an inconsistent value of -1 and triggering a warning in the ext4 put super() function.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-45920

Affected Products

Linux

Linux-Allwinner-5.19

Linux-Aws

Linux-Aws-5.0

Linux-Aws-5.11

Linux-Aws-5.13

Linux-Aws-5.15

Linux-Aws-5.19

Linux-Aws-5.3

Linux-Aws-5.4

Linux-Aws-5.8

Linux-Aws-6.14

Linux-Aws-6.17

Linux-Aws-6.2

Linux-Aws-6.5

Linux-Aws-6.8

Linux-Aws-Fips

Linux-Aws-Hwe

Linux-Azure

Linux-Azure-4.15

Linux-Azure-5.11

Linux-Azure-5.13

Linux-Azure-5.15

Linux-Azure-5.19

Linux-Azure-5.3

Linux-Azure-5.4

Linux-Azure-5.8

Linux-Azure-6.11

Linux-Azure-6.14

Linux-Azure-6.17

Linux-Azure-6.2

Linux-Azure-6.5

Linux-Azure-6.8

Linux-Azure-Edge

Linux-Azure-Fde

Linux-Azure-Fde-5.15

Linux-Azure-Fde-5.19

Linux-Azure-Fde-6.14

Linux-Azure-Fde-6.17

Linux-Azure-Fde-6.2

Linux-Azure-Fde-6.8

Linux-Azure-Fips

Linux-Azure-Nvidia

Linux-Azure-Nvidia-6.14

Linux-Bluefield

Linux-Fips

Linux-Gcp

Linux-Gcp-4.15

Linux-Gcp-5.11

Linux-Gcp-5.13

Linux-Gcp-5.15

Linux-Gcp-5.19

Linux-Gcp-5.3

Linux-Gcp-5.4

Linux-Gcp-5.8

Linux-Gcp-6.11

Linux-Gcp-6.14

Linux-Gcp-6.17

Linux-Gcp-6.2

Linux-Gcp-6.5

Linux-Gcp-6.8

Linux-Gcp-Fips

Linux-Gke

Linux-Gke-4.15

Linux-Gkeop-5.15

Linux-Gke-5.4

Linux-Gkeop

Linux-Hwe

Linux-Hwe-5.11

Linux-Hwe-5.13

Linux-Hwe-5.15

Linux-Hwe-5.19

Linux-Hwe-5.4

Linux-Hwe-5.8

Linux-Hwe-6.11

Linux-Hwe-6.14

Linux-Hwe-6.17

Linux-Hwe-6.2

Linux-Hwe-6.5

Linux-Hwe-6.8

Linux-Hwe-Edge

Linux-Ibm

Linux-Ibm-5.15

Linux-Ibm-5.4

Linux-Ibm-6.8

Linux-Intel-5.13

Linux-Intel-Iot-Realtime

Linux-Intel-Iotg

Linux-Intel-Iotg-5.15

Linux-Iot

Linux-Kvm

Linux-Lowlatency

Linux-Lowlatency-Hwe-5.15

Linux-Lowlatency-Hwe-5.19

Linux-Lowlatency-Hwe-6.11

Linux-Lowlatency-Hwe-6.2

Linux-Lowlatency-Hwe-6.5

Linux-Lowlatency-Hwe-6.8

Linux-Lts

Linux-Lts-Xenial

Linux-Nvidia

Linux-Nvidia-6.11

Linux-Nvidia-6.17

Linux-Nvidia-6.2

Linux-Nvidia-6.5

Linux-Nvidia-6.8

Linux-Nvidia-Lowlatency

Linux-Nvidia-Tegra

Linux-Nvidia-Tegra-5.15

Linux-Nvidia-Tegra-Igx

Linux-Oem

Linux-Oem-5.10

Linux-Oem-5.13

Linux-Oem-5.14

Linux-Oem-5.17

Linux-Oem-5.6

Linux-Oem-6.0

Linux-Oem-6.1

Linux-Oem-6.11

Linux-Oem-6.14

Linux-Oem-6.17

Linux-Oem-6.5

Linux-Oem-6.8

Linux-Oracle

Linux-Oracle-5.0

Linux-Oracle-5.11

Linux-Oracle-5.13

Linux-Oracle-5.15

Linux-Oracle-5.3

Linux-Oracle-5.4

Linux-Oracle-5.8

Linux-Oracle-6.14

Linux-Oracle-6.17

Linux-Oracle-6.5

Linux-Oracle-6.8

Linux-Raspi

Linux-Raspi-5.4

Linux-Raspi-Realtime

Linux-Raspi2

Linux-Realtime

Linux-Realtime-6.14

Linux-Realtime-6.17

Linux-Realtime-6.8

Linux-Riscv

Linux-Riscv-5.11

Linux-Riscv-5.15

Linux-Riscv-5.19

Linux-Riscv-5.8

Linux-Riscv-6.14

Linux-Riscv-6.17

Linux-Riscv-6.5

Linux-Riscv-6.8

Linux-Starfive-5.19

Linux-Starfive-6.2

Linux-Starfive-6.5

Linux-Xilinx

Linux-Xilinx-Zynqmp

References · 17

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-45920 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-45920 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-45920 · Security Note
• https://ubuntu.com/security/CVE-2026-45920 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-45920 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-45920 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-45920 · Security Note
• https://git.kernel.org/stable/c/55576fa14771d33994c29a9ae960e07bb3f56c20 · Note
• https://git.kernel.org/stable/c/ca408af08544d96769c93a3d81a7f63f61129e95 · Note
• https://git.kernel.org/stable/c/3924aea2c33df3864929c1acd178bfc29d8f005f · Note
• https://docs.bell-sw.com/security/cves/CVE-2026-45920 · Note
• https://git.kernel.org/stable/c/94a8cea54cd935c54fa2fba70354757c0fc245e3 · Note
• https://git.kernel.org/stable/c/523d5a4df3c649fa305c89efb552ec62a1ce9d3d · Note
• https://git.kernel.org/linus/94a8cea54cd935c54fa2fba70354757c0fc245e3 · Note
• https://git.kernel.org/stable/c/81982a11406c5da6c6e2b188028e7056e16b7128 · Note