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Vulnerability · Published May 6, 2026 · Assigned by Linux

CVE-2026-43127ntfs3: fix circular locking dependency in run_unpack_ex

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.1%top 98.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix circular locking dependency in run_unpack_ex Syzbot reported a circular locking dependency between wnd->rw_lock (sbi->used.bitmap) and ni->file.run_lock. The deadlock scenario: 1. ntfs_extend_mft() takes ni->file.run_lock then wnd->rw_lock. 2. run_unpack_ex() takes wnd->rw_lock then tries to acquire ni->file.run_lock inside ntfs_refresh_zone(). This creates an AB-BA deadlock. Fix this by using down_read_trylock() instead of down_read() when acquiring run_lock in run_unpack_ex(). If the lock is contended, skip ntfs_refresh_zone() - the MFT zone will be refreshed on the next MFT operation. This breaks the circular dependency since we never block waiting for run_lock while holding wnd->rw_lock.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.12.115-2DEBIAN-CVE-2026-43127
Debian:14linux6.19.6-1DEBIAN-CVE-2026-43127
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-43127
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-43127
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-43127
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-43127

Affected products (as reported)

VendorProductVersions
Linux Linux 57f7979aefdcef66326bda47e07ee0d8be64bf21 – before d60f09d2d16c44a797d8cb67015cde2508720506db7fc56646cafe39599a4c21f1398e2bdfd5c185 – before 76016d15bbd90caa0ce7765fddf9bde8e943e6015fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 – before b014372b62237521444ee51384549bdf48b790155fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 – before b8d22d9d8260b0f4f4d8e2898c98037c9982ea665fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 – before 08ce2fee1b869ecbfbd94e0eb2630e52203a2e036.6.66 – before 6.6.1606.12.5 – before 6.12.114
Linux Linux 6.13

References