Race condition in Linux kernel - CVE-2026-31575

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Main Vulnerability Database Vulnerabilities #VU127816

Race condition in Linux kernel - CVE-2026-31575

Published: April 25, 2026


Vulnerability identifier: #VU127816
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-31575
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in mfill_atomic_hugetlb() when handling userfaultfd hugetlb faults. A local user can trigger faults on different addresses within the same huge page to cause a denial of service.

The issue can corrupt the reservation map and trigger the BUG_ON in resv_map_release().


Affected software

Linux kernel
Debian Linux
Ubuntu
openEuler
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-extra-modules
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux (Debian package)
linux-raspi (Ubuntu package)

How to mitigate CVE-2026-31575

Install security update from vendor's repository.

python3-perf-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
python3-perf - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
perf-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
perf - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-tools-devel - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-tools-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-tools - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-source - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-headers - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-devel - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-debugsource - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
bpftool-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
bpftool - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-extra-modules - update to 6.6.0-145.0.10.141
linux (Ubuntu package) - addressed in versions 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2, 7.0.0-27.27
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1, 7.0.0-1013.13
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-aws (Ubuntu package) - update to 6.8.0-1061.64+1
linux-azure-fde (Ubuntu package) - update to 6.8.0-1062.69
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-fips (Ubuntu package) - update to 6.8.0-1063.71+fips2
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1
linux (Debian package) - update to 6.12.85-1
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

External References

Related Security Bulletins